diff mbox series

Linux: Add execveat system call wrapper

Message ID 20201203142053.897832-1-ahajkova@redhat.com
State Changes Requested
Headers show
Series Linux: Add execveat system call wrapper | expand

Commit Message

Alexandra Hájková Dec. 3, 2020, 2:20 p.m. UTC
From: Alexandra Hájková <ahajkova@redhat.com>

 Also add the test for the new wrapper.
---
This version:
 * extends NEWS entry
 * adds various one line comments
 * uses exit $FOO instead of exit 3 to test if FOO was set properly
 * removes the implicit check
 * improves comments
 * removes unnecessary Makefile change
 * returns INLINE_SYSCALL_CALL return value



 NEWS                                          |   5 +
 posix/Makefile                                |   5 +-
 posix/Versions                                |   3 +
 posix/execveat.c                              |  41 ++++
 posix/tst-execveat.c                          | 180 ++++++++++++++++++
 posix/unistd.h                                |   5 +
 sysdeps/mach/hurd/i386/libc.abilist           |   1 +
 sysdeps/unix/sysv/linux/aarch64/libc.abilist  |   1 +
 sysdeps/unix/sysv/linux/alpha/libc.abilist    |   1 +
 sysdeps/unix/sysv/linux/arm/be/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/arm/le/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/csky/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/execveat.c            |  82 ++++++++
 sysdeps/unix/sysv/linux/hppa/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/i386/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/ia64/libc.abilist     |   1 +
 .../sysv/linux/m68k/coldfire/libc.abilist     |   1 +
 .../unix/sysv/linux/m68k/m680x0/libc.abilist  |   1 +
 .../sysv/linux/microblaze/be/libc.abilist     |   1 +
 .../sysv/linux/microblaze/le/libc.abilist     |   1 +
 .../sysv/linux/mips/mips32/fpu/libc.abilist   |   1 +
 .../sysv/linux/mips/mips32/nofpu/libc.abilist |   1 +
 .../sysv/linux/mips/mips64/n32/libc.abilist   |   1 +
 .../sysv/linux/mips/mips64/n64/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/nios2/libc.abilist    |   1 +
 .../linux/powerpc/powerpc32/fpu/libc.abilist  |   1 +
 .../powerpc/powerpc32/nofpu/libc.abilist      |   1 +
 .../linux/powerpc/powerpc64/be/libc.abilist   |   1 +
 .../linux/powerpc/powerpc64/le/libc.abilist   |   1 +
 .../unix/sysv/linux/riscv/rv64/libc.abilist   |   1 +
 .../unix/sysv/linux/s390/s390-32/libc.abilist |   1 +
 .../unix/sysv/linux/s390/s390-64/libc.abilist |   1 +
 sysdeps/unix/sysv/linux/sh/be/libc.abilist    |   1 +
 sysdeps/unix/sysv/linux/sh/le/libc.abilist    |   1 +
 .../sysv/linux/sparc/sparc32/libc.abilist     |   1 +
 .../sysv/linux/sparc/sparc64/libc.abilist     |   1 +
 .../unix/sysv/linux/x86_64/64/libc.abilist    |   1 +
 .../unix/sysv/linux/x86_64/x32/libc.abilist   |   1 +
 38 files changed, 350 insertions(+), 2 deletions(-)
 create mode 100644 posix/execveat.c
 create mode 100644 posix/tst-execveat.c
 create mode 100644 sysdeps/unix/sysv/linux/execveat.c

Comments

Andreas Schwab Dec. 3, 2020, 2:37 p.m. UTC | #1
On Dez 03 2020, Alexandra Hájková via Libc-alpha wrote:

> +* The function execveat have been added and it operates similar to execve.
> +  The syscall is already used to implement fexecve without require /proc to

I think that should be "without requiring".

> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> index 4cc1c6a591..d281749621 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> @@ -2155,6 +2155,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F

The list must be sorted.

Andreas.
Adhemerval Zanella Dec. 8, 2020, 2:44 p.m. UTC | #2
On 03/12/2020 11:20, Alexandra Hájková via Libc-alpha wrote:
> From: Alexandra Hájková <ahajkova@redhat.com>
> 
>  Also add the test for the new wrapper.
> ---
> This version:
>  * extends NEWS entry
>  * adds various one line comments
>  * uses exit $FOO instead of exit 3 to test if FOO was set properly
>  * removes the implicit check
>  * improves comments
>  * removes unnecessary Makefile change
>  * returns INLINE_SYSCALL_CALL return value
> 
> 

There are some formatting issues on comment the test, I think we should
nonnull for envp as well, and some changes on the Linux implementation
fallback.  Also, you did not state if and how you have tested both the 
__NR_execveat syscall and the fallback. 

I also wondering if we could always check the fallback mechanism with
an internal test.  It would require to move implementation to
a different file (sysdeps/unix/sysv/linux/execveat_fallback.c) which
does:

  static int
  execveat_fallback (int dirfd, const char *path, char *const argv[],
                     char *const envp[], int flags)
  {
     if ((flags & ~(AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW)) != 0)
       [...]
  }

And on the Linux execveat.c does something like:

  #ifndef __ASSUME_EXECVEAT
  # include "execveat_fallback.c"
  #endif
  [...]
  int
  execveat (int dirfd, const char *path, char *const argv[], char *const envp[],
            int flags)
  {
    INLINE_SYSCALL_CALL (execveat, dirfd, path, &argv[0], &envp[0], flags);
  #ifndef __ASSUME_EXECVEAT
    if (errno != ENOSYS)
      return -1;
  
    return execveat_fallback (dirfd, path, argv, envp, flags);
  #endif


And test similar to the one done for copy_file_range compat (added by
bad7a0c81f501fbbcc79af9eaa4b8254441c4a1f).

> 
>  NEWS                                          |   5 +
>  posix/Makefile                                |   5 +-
>  posix/Versions                                |   3 +
>  posix/execveat.c                              |  41 ++++
>  posix/tst-execveat.c                          | 180 ++++++++++++++++++
>  posix/unistd.h                                |   5 +
>  sysdeps/mach/hurd/i386/libc.abilist           |   1 +
>  sysdeps/unix/sysv/linux/aarch64/libc.abilist  |   1 +
>  sysdeps/unix/sysv/linux/alpha/libc.abilist    |   1 +
>  sysdeps/unix/sysv/linux/arm/be/libc.abilist   |   1 +
>  sysdeps/unix/sysv/linux/arm/le/libc.abilist   |   1 +
>  sysdeps/unix/sysv/linux/csky/libc.abilist     |   1 +
>  sysdeps/unix/sysv/linux/execveat.c            |  82 ++++++++
>  sysdeps/unix/sysv/linux/hppa/libc.abilist     |   1 +
>  sysdeps/unix/sysv/linux/i386/libc.abilist     |   1 +
>  sysdeps/unix/sysv/linux/ia64/libc.abilist     |   1 +
>  .../sysv/linux/m68k/coldfire/libc.abilist     |   1 +
>  .../unix/sysv/linux/m68k/m680x0/libc.abilist  |   1 +
>  .../sysv/linux/microblaze/be/libc.abilist     |   1 +
>  .../sysv/linux/microblaze/le/libc.abilist     |   1 +
>  .../sysv/linux/mips/mips32/fpu/libc.abilist   |   1 +
>  .../sysv/linux/mips/mips32/nofpu/libc.abilist |   1 +
>  .../sysv/linux/mips/mips64/n32/libc.abilist   |   1 +
>  .../sysv/linux/mips/mips64/n64/libc.abilist   |   1 +
>  sysdeps/unix/sysv/linux/nios2/libc.abilist    |   1 +
>  .../linux/powerpc/powerpc32/fpu/libc.abilist  |   1 +
>  .../powerpc/powerpc32/nofpu/libc.abilist      |   1 +
>  .../linux/powerpc/powerpc64/be/libc.abilist   |   1 +
>  .../linux/powerpc/powerpc64/le/libc.abilist   |   1 +
>  .../unix/sysv/linux/riscv/rv64/libc.abilist   |   1 +
>  .../unix/sysv/linux/s390/s390-32/libc.abilist |   1 +
>  .../unix/sysv/linux/s390/s390-64/libc.abilist |   1 +
>  sysdeps/unix/sysv/linux/sh/be/libc.abilist    |   1 +
>  sysdeps/unix/sysv/linux/sh/le/libc.abilist    |   1 +
>  .../sysv/linux/sparc/sparc32/libc.abilist     |   1 +
>  .../sysv/linux/sparc/sparc64/libc.abilist     |   1 +
>  .../unix/sysv/linux/x86_64/64/libc.abilist    |   1 +
>  .../unix/sysv/linux/x86_64/x32/libc.abilist   |   1 +
>  38 files changed, 350 insertions(+), 2 deletions(-)
>  create mode 100644 posix/execveat.c
>  create mode 100644 posix/tst-execveat.c
>  create mode 100644 sysdeps/unix/sysv/linux/execveat.c
> 
> diff --git a/NEWS b/NEWS
> index aa7bbf033b..5ffe99fa81 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -28,6 +28,11 @@ Major new features:
>    The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
>    2.28.
>  
> +* The function execveat have been added and it operates similar to execve.
> +  The syscall is already used to implement fexecve without require /proc to
> +  be mounted.  Similar to fexecve, if the syscall is not supported a fallback
> +  which access /proc is used.
> +
>  Deprecated and removed features, and other changes affecting compatibility:
>  
>  * The mallinfo function is marked deprecated.  Callers should call

Ok.

> diff --git a/posix/Makefile b/posix/Makefile
> index 4bfc8d942c..ca678ad781 100644
> --- a/posix/Makefile
> +++ b/posix/Makefile
> @@ -65,7 +65,8 @@ routines :=								      \
>  	spawnattr_setsigmask spawnattr_setschedpolicy spawnattr_setschedparam \
>  	posix_madvise							      \
>  	get_child_max sched_cpucount sched_cpualloc sched_cpufree \
> -	streams-compat
> +	streams-compat                                            \
> +	execveat
>  
>  aux		:= init-posix environ
>  tests		:= test-errno tstgetopt testfnm runtests runptests \

Ok.

> @@ -102,7 +103,7 @@ tests		:= test-errno tstgetopt testfnm runtests runptests \
>  		   tst-sysconf-empty-chroot tst-glob_symlinks tst-fexecve \
>  		   tst-glob-tilde test-ssize-max tst-spawn4 bug-regex37 \
>  		   bug-regex38 tst-regcomp-truncated tst-spawn-chdir \
> -		   tst-wordexp-nocmd
> +		   tst-wordexp-nocmd tst-execveat
>  tests-internal	:= bug-regex5 bug-regex20 bug-regex33 \
>  		   tst-rfc3484 tst-rfc3484-2 tst-rfc3484-3 \
>  		   tst-glob_lstat_compat tst-spawn4-compat

Ok.

> diff --git a/posix/Versions b/posix/Versions
> index 7d06a6d0c0..9d07ce6c96 100644
> --- a/posix/Versions
> +++ b/posix/Versions
> @@ -147,6 +147,9 @@ libc {
>    }
>    GLIBC_2.30 {
>    }
> +  GLIBC_2.33 {
> +    execveat;
> +  }
>    GLIBC_PRIVATE {
>      __libc_fork; __libc_pread; __libc_pwrite;
>      __nanosleep_nocancel; __pause_nocancel;
> diff --git a/posix/execveat.c b/posix/execveat.c
> new file mode 100644
> index 0000000000..035ce50b28
> --- /dev/null
> +++ b/posix/execveat.c
> @@ -0,0 +1,41 @@
> +/* execveat - execute program relative to a directory file descriptor
> +   Copyright (C) 2020 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <errno.h>
> +#include <stddef.h>
> +#include <unistd.h>
> +
> +/* Replace the current process, executing PATH relative to DIFRD with
> + * arguments ARGV and environment ENVP.
> + * ARGV and ENVP are terminated by NULL pointers.  */
> +int
> +__execveat (int dirfd, const char *path, char *const argv[], char *const envp[],
> +            int flags)
> +{
> +  if (difrd < 0 || path == NULL || argv == NULL || envp == NULL)
> +    {
> +      __set_errno (EINVAL);
> +      return -1;
> +    }
> +
> +  __set_errno (ENOSYS);
> +  return -1;
> +}
> +stub_warning (execveat)
> +
> +weak_alias (__execveat, execveat)

Ok.

> diff --git a/posix/tst-execveat.c b/posix/tst-execveat.c
> new file mode 100644
> index 0000000000..7da501b2a7
> --- /dev/null
> +++ b/posix/tst-execveat.c
> @@ -0,0 +1,180 @@
> +/* Test execveat at the various corner cases.
> +   Copyright (C) 2020 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <fcntl.h>
> +#include <errno.h>
> +#include <stdlib.h>
> +#include <sys/types.h>
> +#include <dirent.h>
> +#include <support/check.h>
> +#include <support/support.h>
> +#include <support/temp_file.h>
> +#include <support/xdlfcn.h>
> +#include <support/xstdio.h>
> +#include <support/xunistd.h>
> +#include <wait.h>
> +#include <support/test-driver.h>
> +
> +int
> +call_execveat (int fd, const char *pathname, int flags, int expected_fail,
> +               int num)
> +{
> +  char *argv[] = { (char *) "sh", (char *) "-c", (char *) "exit 3", NULL };
> +  char *envp[] = { (char *) "FOO=BAR", NULL };
> +  pid_t pid;
> +  int status;
> +
> +  if (test_verbose > 0)
> +    printf ("call line number: %d\n", num);
> +
> +  pid = xfork ();
> +  if (pid == 0)
> +    {
> +      TEST_COMPARE (execveat (fd, pathname, argv, envp, flags), -1);
> +      if (errno == ENOSYS)
> +        FAIL_UNSUPPORTED ("execveat is unimplemented");
> +      else if (errno == expected_fail)
> +        {
> +          if (test_verbose > 0)
> +            printf ("expected fail: errno %d\n", errno);
> +          _exit (0);
> +        }
> +      else
> +        FAIL_EXIT1 ("execveat failed: %m (%d)", errno);
> +    }
> +  xwaitpid (pid, &status, 0);
> +
> +  if (WIFEXITED (status))
> +    {
> +      if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
> +        FAIL_UNSUPPORTED ("execveat is unimplemented");
> +      else if (expected_fail != 0)
> +        TEST_COMPARE (WEXITSTATUS (status), 0);
> +      else
> +        TEST_COMPARE (WEXITSTATUS (status), 3);
> +    }
> +  return 0;
> +}

Ok.

> +
> +static int
> +do_test (void)
> +{
> +  DIR *dirp;
> +  int fd, fd_out;
> +  char *tmp_dir, *symlink_name, *tmp_sh;
> +  struct stat st;
> +
> +  dirp = opendir ("/bin");
> +  if (dirp == NULL)
> +    FAIL_EXIT1 ("failed to open /bin");
> +  fd = dirfd (dirp);
> +
> +  /* Call execveat for various fd/pathname combinations  */

Missing period.

> +
> +  /* Check the pathname relative to a valid dirfd.  */
> +  call_execveat (fd, "sh", 0, 0, __LINE__);
> +  chdir ("/bin");

Check chdir return value or add a xchdir on libsupport.

> +  /* Use the special value AT_FDCWD as dirfd.
> +     If pathname is relative and dirfd is the special value AT_FDCWD, then
> +     pathname is interpreted relative to the current working directory of
> +     the calling process.  */
> +  call_execveat (AT_FDCWD, "sh", 0, 0, __LINE__);
> +  xclose (fd);

Ok.

> +#ifdef O_PATH
> +  /* Check the pathname relative to a valid dirfd with O_PATH.  */
> +  fd = xopen ("/bin", O_PATH | O_DIRECTORY, O_RDONLY);
> +  call_execveat (fd, "sh", 0, 0, __LINE__);
> +  xclose (fd);
> +

Ok.

> +  /* Check absolute pathname, dirfd should be ignored.  */
> +  call_execveat (AT_FDCWD, "/bin/sh", 0, 0, __LINE__);
> +  fd = xopen ("/usr", O_PATH | O_DIRECTORY, 0);
> +  /* Same check for absolute pathname, but with input file descriptor
> +     openend with different flags.  The dirfd should be ignored.  */
> +  call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
> +  xclose (fd);
> +#endif
> +

Ok.

> +  fd = xopen ("/usr", O_RDONLY, 0);
> +  /* Same check for absolute pathname, but with input file descriptor
> +     openend with different flags.  The dirfd should be ignored.  */
> +  call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
> +  xclose (fd);
> +

Ok.

> +  fd = xopen ("/bin/sh", O_RDONLY, 0);
> +  /* Check relative pathname, where dirfd does not point to a directory.  */
> +  call_execveat (fd, "sh", 0, ENOTDIR, __LINE__);
> +  /* Check absolute pathname, but dirfd is a regular file.  The dirfd
> +     should be ignored. */
> +  call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
> +  xclose (fd);
> +

Ok.

> +#ifdef O_PATH
> +  /* O_PATH

I think this line in dangling here.

> +     Obtain a file descriptor that can be used for two purposes: to
> +     indicate a location in the filesystem tree and to perform
> +     operations that act purely at the file descriptor level. */

Double space after period.  There also other occurences below.

> +  fd = xopen ("/bin/sh", O_PATH, 0);
> +  /* Check the empty pathname. Dirfd is a regular file with O_PATH.  */
> +  call_execveat (fd, "", 0, ENOENT, __LINE__);
> +  /* Same check for an empty pathname, but with AT_EMPTY_PATH flag.
> +     (If oldpath is an empty string, create a link to the file referenced
> +     by olddirfd (which may have been obtained using the open(2) O_PATH flag) */
> +  call_execveat (fd, "", AT_EMPTY_PATH, 0, __LINE__);

Ok.

> + /* Same check for an empty pathname, but the different flags.  */
> +  call_execveat (fd, "", AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW, 0, __LINE__);
> +  xclose (fd);
> +

Ok.

> +  tmp_dir = support_create_temp_directory ("tst-execveat_dir");
> +  symlink_name = xasprintf ("%s/symlink", tmp_dir);
> +  xsymlink ("tmp_sh", symlink_name);
> +  add_temp_file (symlink_name);
> +  tmp_sh = xasprintf ("%s/tmp_sh", tmp_dir);
> +  add_temp_file (tmp_sh);
> +  fd_out = xopen (symlink_name, O_CREAT | O_WRONLY, 0);
> +  stat ("/bin/sh", &st);

Use xstat (it would require use a stat64 for 'st' as well). 

> +  fd = xopen ("/bin/sh", O_RDONLY, 0);
> +  xcopy_file_range (fd, 0, fd_out, 0, st.st_size, 0);
> +  fchmod (fd_out, 0777);

Check the return value of fchmod or add a xfchmod on libsupport.

> +  xclose (fd);
> +  xclose (fd_out);
> +  fd_out = xopen (symlink_name, O_PATH, 0);
> +
> + /* Check the empty pathname. Dirfd is a symbolic link.  */
> +  call_execveat (fd_out, "", 0, ENOENT, __LINE__);
> + /* Same check for an empty pathname, but the different flags.  */
> +  call_execveat (fd_out, "", AT_EMPTY_PATH, 0, __LINE__);
> + /* Same check for an empty pathname, but the different flags.  */
> +  call_execveat (fd_out, "", AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW, 0,
> +                 __LINE__);
> +  xclose (fd_out);
> +  free (symlink_name);
> +  free (tmp_sh);
> +  free (tmp_dir);
> +#endif

Ok.

> +
> +  /* Call execveat with closed fd, we expect this to fail with EBADF  */
> +  call_execveat (fd, "sh", 0, EBADF, __LINE__);
> +  /* Call execveat with closed fd, we expect this to pass because the pathname is
> +     absolute  */
> +  call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>

Ok.

> diff --git a/posix/unistd.h b/posix/unistd.h
> index 32b8161619..b1117f2eda 100644
> --- a/posix/unistd.h
> +++ b/posix/unistd.h
> @@ -295,6 +295,11 @@ extern int euidaccess (const char *__name, int __type)
>  /* An alias for `euidaccess', used by some other systems.  */
>  extern int eaccess (const char *__name, int __type)
>       __THROW __nonnull ((1));
> +
> +/* Execute program relative to a directory file descriptor.  */
> +extern int execveat (int __fd, const char *__path, char *const __argv[],
> +                     char *const __envp[], int __flags)
> +    __THROW __nonnull ((2, 3));
>  #endif

I think we should make '__envp' as nonull as well, POSIX indicates that 
is should be an array of character pointers to null-terminated strings.

Linux does allow NULL envp though.

>  
>  #ifdef __USE_ATFILE
> diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
> index 7a5eb66b85..5afcd48075 100644
> --- a/sysdeps/mach/hurd/i386/libc.abilist
> +++ b/sysdeps/mach/hurd/i386/libc.abilist
> @@ -2181,6 +2181,7 @@ GLIBC_2.3.4 xdr_quad_t F
>  GLIBC_2.3.4 xdr_u_quad_t F
>  GLIBC_2.30 twalk_r F
>  GLIBC_2.32 __libc_single_threaded D 0x1
> +GLIBC_2.32 execveat F
>  GLIBC_2.32 mach_print F
>  GLIBC_2.32 mremap F
>  GLIBC_2.32 sigabbrev_np F
> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> index 4cc1c6a591..d281749621 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> @@ -2155,6 +2155,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> index 26ad9845e4..9bbcda105e 100644
> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> @@ -2237,6 +2237,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> index 3b0a47e967..25ce4024a8 100644
> --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> @@ -139,6 +139,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> index 9ab3924888..31675a4068 100644
> --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> @@ -136,6 +136,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
> index 14a84dac8f..b4b760fbc5 100644
> --- a/sysdeps/unix/sysv/linux/csky/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
> @@ -2099,6 +2099,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/execveat.c b/sysdeps/unix/sysv/linux/execveat.c
> new file mode 100644
> index 0000000000..af3193e1d5
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/execveat.c
> @@ -0,0 +1,82 @@
> +/* execveat - execute program relative to a directory file descriptor
> +   Copyright (C) 2020 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <errno.h>
> +#include <stddef.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +#include <fcntl.h>
> +#include <sys/stat.h>
> +
> +#include <sysdep.h>
> +#include <sys/syscall.h>
> +#include <kernel-features.h>
> +#include <fd_to_filename.h>
> +#include <not-cancel.h>
> +
> +/* Execute the file FD refers to, overlaying the running program image.
> +   ARGV and ENVP are passed to the new program, as for `execve'.  */
> +int
> +execveat (int dirfd, const char *path, char *const argv[], char *const envp[],
> +          int flags)
> +{
> +    int ret;
> +
> +  /* Avoid implicit array coercion in syscall macros.  */
> +    ret = INLINE_SYSCALL_CALL (execveat, dirfd, path, &argv[0], &envp[0], flags);
> +#ifndef __ASSUME_EXECVEAT
> +  if (errno != ENOSYS)
> +    return ret;

As Florian has pointed out, the ret code is not really required here
(it will be always -1 for INLINE_SYSCALL_CALL).

> +
> +  if ((flags & ~(AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW)) != 0)
> +    return EINVAL;

It should be INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL) (which set
errno to EINVAL and returns -1).

> +
> +  int fd;
> +  if (path[0] == '\0' && (flags & AT_EMPTY_PATH) && dirfd >= 0)
> +    fd = dirfd;
> +  else
> +    {
> +      int oflags = O_CLOEXEC;
> +      if (flags & AT_SYMLINK_NOFOLLOW)
> +        oflags |= O_NOFOLLOW;
> +      fd = __openat_nocancel (dirfd, path, oflags);
> +    }
> +  if (fd < 0)
> +    return ret;

It should be INLINE_SYSCALL_ERROR_RETURN_VALUE (EBADFD), for the
case where 'dirfd' is negative.

> +
> +  struct fd_to_filename fdfilename;
> +  const char *gfilename = __fd_to_filename (fd, &fdfilename);
> +
> +  /* We do not need the return value.  */
> +  __execve (gfilename, argv, envp);
> +
> +  int save = errno;
> +
> +  /* We come here only if the 'execve' call fails.  Determine whether
> +     /proc is mounted.  If not we return ENOSYS.  */
> +  struct stat64 st;
> +  if (stat64 ("/proc/self/fd", &st) != 0 && errno == ENOENT)

Maybe use FD_TO_FILENAME_PREFIX here.

> +    save = ENOSYS;
> +
> +  if (fd != dirfd)
> +    __close_nocancel_nostatus (fd);
> +  __set_errno (save);
> +#endif
> +
> +  return ret;
> +}
> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> index 5c8502f3d3..71ddaa2930 100644
> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> @@ -2058,6 +2058,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> index 4f0d3c1eb5..350687bf6f 100644
> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> @@ -2224,6 +2224,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> index e3b345b803..8ac4337b70 100644
> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> @@ -2090,6 +2090,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> index 25f2d1c08f..425a44bc5f 100644
> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> @@ -140,6 +140,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> index c4891479d3..057c77119b 100644
> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> @@ -2170,6 +2170,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> index 143b0163b4..a85ea5a0bd 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> @@ -2150,6 +2150,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> index 13d374a031..5822ab2896 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> @@ -2147,6 +2147,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> index b2295f1937..30ead20668 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> @@ -2141,6 +2141,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> index 4c786070d0..ac35f615aa 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> @@ -2139,6 +2139,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> index aa9c6a4dca..76ae132755 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> @@ -2147,6 +2147,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> index 5939588ad5..45ddc18ec1 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> @@ -2141,6 +2141,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> index 92556c4237..3887748b90 100644
> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> @@ -2188,6 +2188,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> index 26c93dff05..a32a53e330 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> @@ -2197,6 +2197,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> index f04b167788..a787e224fc 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> @@ -2230,6 +2230,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> index c2ca00709e..fc8a0a5e1c 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> @@ -2060,6 +2060,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> index 0ea50dc851..e1aaaedfbd 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> @@ -2350,6 +2350,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> index 1626c5351f..35a6b7829b 100644
> --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> @@ -2117,6 +2117,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> index a66426eb4d..efa1bb3d9e 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> @@ -2195,6 +2195,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> index ab351873ae..27958ec30c 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> @@ -2096,6 +2096,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> index 22ceaa3d87..40a904ac55 100644
> --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> @@ -2065,6 +2065,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> index d36f228192..621c547e32 100644
> --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> @@ -2062,6 +2062,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> index 59b4313280..f01f085b5b 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> @@ -2186,6 +2186,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> index 266dcdfa08..c9225ae42e 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> @@ -2113,6 +2113,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> index 4fff61818b..5e1cb8b63c 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> @@ -2071,6 +2071,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> index 102ed47a9c..de1d452320 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> @@ -2168,6 +2168,7 @@ GLIBC_2.32 pthread_attr_setaffinity_np F
>  GLIBC_2.32 pthread_attr_setsigmask_np F
>  GLIBC_2.32 pthread_getaffinity_np F
>  GLIBC_2.32 pthread_getattr_np F
> +GLIBC_2.33 execveat F
>  GLIBC_2.32 pthread_sigmask F
>  GLIBC_2.32 sigabbrev_np F
>  GLIBC_2.32 sigdescr_np F
>
Florian Weimer Dec. 8, 2020, 3:18 p.m. UTC | #3
* Adhemerval Zanella:

> On 03/12/2020 11:20, Alexandra Hájková via Libc-alpha wrote:
>> From: Alexandra Hájková <ahajkova@redhat.com>
>> 
>>  Also add the test for the new wrapper.
>> ---
>> This version:
>>  * extends NEWS entry
>>  * adds various one line comments
>>  * uses exit $FOO instead of exit 3 to test if FOO was set properly
>>  * removes the implicit check
>>  * improves comments
>>  * removes unnecessary Makefile change
>>  * returns INLINE_SYSCALL_CALL return value
>> 
>> 
>
> There are some formatting issues on comment the test, I think we should
> nonnull for envp as well, and some changes on the Linux implementation

I think envp == NULL is a well-documented Linux extension, in wide use
with execve.

Thanks,
Florian
Adhemerval Zanella Dec. 8, 2020, 4:41 p.m. UTC | #4
On 08/12/2020 12:18, Florian Weimer wrote:
> * Adhemerval Zanella:
> 
>> On 03/12/2020 11:20, Alexandra Hájková via Libc-alpha wrote:
>>> From: Alexandra Hájková <ahajkova@redhat.com>
>>>
>>>  Also add the test for the new wrapper.
>>> ---
>>> This version:
>>>  * extends NEWS entry
>>>  * adds various one line comments
>>>  * uses exit $FOO instead of exit 3 to test if FOO was set properly
>>>  * removes the implicit check
>>>  * improves comments
>>>  * removes unnecessary Makefile change
>>>  * returns INLINE_SYSCALL_CALL return value
>>>
>>>
>>
>> There are some formatting issues on comment the test, I think we should
>> nonnull for envp as well, and some changes on the Linux implementation
> 
> I think envp == NULL is a well-documented Linux extension, in wide use
> with execve.

But the generic interface returns EINVAL for NULL envp.  Should we change
it to accept NULL then?
diff mbox series

Patch

diff --git a/NEWS b/NEWS
index aa7bbf033b..5ffe99fa81 100644
--- a/NEWS
+++ b/NEWS
@@ -28,6 +28,11 @@  Major new features:
   The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
   2.28.
 
+* The function execveat have been added and it operates similar to execve.
+  The syscall is already used to implement fexecve without require /proc to
+  be mounted.  Similar to fexecve, if the syscall is not supported a fallback
+  which access /proc is used.
+
 Deprecated and removed features, and other changes affecting compatibility:
 
 * The mallinfo function is marked deprecated.  Callers should call
diff --git a/posix/Makefile b/posix/Makefile
index 4bfc8d942c..ca678ad781 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -65,7 +65,8 @@  routines :=								      \
 	spawnattr_setsigmask spawnattr_setschedpolicy spawnattr_setschedparam \
 	posix_madvise							      \
 	get_child_max sched_cpucount sched_cpualloc sched_cpufree \
-	streams-compat
+	streams-compat                                            \
+	execveat
 
 aux		:= init-posix environ
 tests		:= test-errno tstgetopt testfnm runtests runptests \
@@ -102,7 +103,7 @@  tests		:= test-errno tstgetopt testfnm runtests runptests \
 		   tst-sysconf-empty-chroot tst-glob_symlinks tst-fexecve \
 		   tst-glob-tilde test-ssize-max tst-spawn4 bug-regex37 \
 		   bug-regex38 tst-regcomp-truncated tst-spawn-chdir \
-		   tst-wordexp-nocmd
+		   tst-wordexp-nocmd tst-execveat
 tests-internal	:= bug-regex5 bug-regex20 bug-regex33 \
 		   tst-rfc3484 tst-rfc3484-2 tst-rfc3484-3 \
 		   tst-glob_lstat_compat tst-spawn4-compat
diff --git a/posix/Versions b/posix/Versions
index 7d06a6d0c0..9d07ce6c96 100644
--- a/posix/Versions
+++ b/posix/Versions
@@ -147,6 +147,9 @@  libc {
   }
   GLIBC_2.30 {
   }
+  GLIBC_2.33 {
+    execveat;
+  }
   GLIBC_PRIVATE {
     __libc_fork; __libc_pread; __libc_pwrite;
     __nanosleep_nocancel; __pause_nocancel;
diff --git a/posix/execveat.c b/posix/execveat.c
new file mode 100644
index 0000000000..035ce50b28
--- /dev/null
+++ b/posix/execveat.c
@@ -0,0 +1,41 @@ 
+/* execveat - execute program relative to a directory file descriptor
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <stddef.h>
+#include <unistd.h>
+
+/* Replace the current process, executing PATH relative to DIFRD with
+ * arguments ARGV and environment ENVP.
+ * ARGV and ENVP are terminated by NULL pointers.  */
+int
+__execveat (int dirfd, const char *path, char *const argv[], char *const envp[],
+            int flags)
+{
+  if (difrd < 0 || path == NULL || argv == NULL || envp == NULL)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  __set_errno (ENOSYS);
+  return -1;
+}
+stub_warning (execveat)
+
+weak_alias (__execveat, execveat)
diff --git a/posix/tst-execveat.c b/posix/tst-execveat.c
new file mode 100644
index 0000000000..7da501b2a7
--- /dev/null
+++ b/posix/tst-execveat.c
@@ -0,0 +1,180 @@ 
+/* Test execveat at the various corner cases.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <support/check.h>
+#include <support/support.h>
+#include <support/temp_file.h>
+#include <support/xdlfcn.h>
+#include <support/xstdio.h>
+#include <support/xunistd.h>
+#include <wait.h>
+#include <support/test-driver.h>
+
+int
+call_execveat (int fd, const char *pathname, int flags, int expected_fail,
+               int num)
+{
+  char *argv[] = { (char *) "sh", (char *) "-c", (char *) "exit 3", NULL };
+  char *envp[] = { (char *) "FOO=BAR", NULL };
+  pid_t pid;
+  int status;
+
+  if (test_verbose > 0)
+    printf ("call line number: %d\n", num);
+
+  pid = xfork ();
+  if (pid == 0)
+    {
+      TEST_COMPARE (execveat (fd, pathname, argv, envp, flags), -1);
+      if (errno == ENOSYS)
+        FAIL_UNSUPPORTED ("execveat is unimplemented");
+      else if (errno == expected_fail)
+        {
+          if (test_verbose > 0)
+            printf ("expected fail: errno %d\n", errno);
+          _exit (0);
+        }
+      else
+        FAIL_EXIT1 ("execveat failed: %m (%d)", errno);
+    }
+  xwaitpid (pid, &status, 0);
+
+  if (WIFEXITED (status))
+    {
+      if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
+        FAIL_UNSUPPORTED ("execveat is unimplemented");
+      else if (expected_fail != 0)
+        TEST_COMPARE (WEXITSTATUS (status), 0);
+      else
+        TEST_COMPARE (WEXITSTATUS (status), 3);
+    }
+  return 0;
+}
+
+static int
+do_test (void)
+{
+  DIR *dirp;
+  int fd, fd_out;
+  char *tmp_dir, *symlink_name, *tmp_sh;
+  struct stat st;
+
+  dirp = opendir ("/bin");
+  if (dirp == NULL)
+    FAIL_EXIT1 ("failed to open /bin");
+  fd = dirfd (dirp);
+
+  /* Call execveat for various fd/pathname combinations  */
+
+  /* Check the pathname relative to a valid dirfd.  */
+  call_execveat (fd, "sh", 0, 0, __LINE__);
+  chdir ("/bin");
+  /* Use the special value AT_FDCWD as dirfd.
+     If pathname is relative and dirfd is the special value AT_FDCWD, then
+     pathname is interpreted relative to the current working directory of
+     the calling process.  */
+  call_execveat (AT_FDCWD, "sh", 0, 0, __LINE__);
+  xclose (fd);
+#ifdef O_PATH
+  /* Check the pathname relative to a valid dirfd with O_PATH.  */
+  fd = xopen ("/bin", O_PATH | O_DIRECTORY, O_RDONLY);
+  call_execveat (fd, "sh", 0, 0, __LINE__);
+  xclose (fd);
+
+  /* Check absolute pathname, dirfd should be ignored.  */
+  call_execveat (AT_FDCWD, "/bin/sh", 0, 0, __LINE__);
+  fd = xopen ("/usr", O_PATH | O_DIRECTORY, 0);
+  /* Same check for absolute pathname, but with input file descriptor
+     openend with different flags.  The dirfd should be ignored.  */
+  call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
+  xclose (fd);
+#endif
+
+  fd = xopen ("/usr", O_RDONLY, 0);
+  /* Same check for absolute pathname, but with input file descriptor
+     openend with different flags.  The dirfd should be ignored.  */
+  call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
+  xclose (fd);
+
+  fd = xopen ("/bin/sh", O_RDONLY, 0);
+  /* Check relative pathname, where dirfd does not point to a directory.  */
+  call_execveat (fd, "sh", 0, ENOTDIR, __LINE__);
+  /* Check absolute pathname, but dirfd is a regular file.  The dirfd
+     should be ignored. */
+  call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
+  xclose (fd);
+
+#ifdef O_PATH
+  /* O_PATH
+     Obtain a file descriptor that can be used for two purposes: to
+     indicate a location in the filesystem tree and to perform
+     operations that act purely at the file descriptor level. */
+  fd = xopen ("/bin/sh", O_PATH, 0);
+  /* Check the empty pathname. Dirfd is a regular file with O_PATH.  */
+  call_execveat (fd, "", 0, ENOENT, __LINE__);
+  /* Same check for an empty pathname, but with AT_EMPTY_PATH flag.
+     (If oldpath is an empty string, create a link to the file referenced
+     by olddirfd (which may have been obtained using the open(2) O_PATH flag) */
+  call_execveat (fd, "", AT_EMPTY_PATH, 0, __LINE__);
+ /* Same check for an empty pathname, but the different flags.  */
+  call_execveat (fd, "", AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW, 0, __LINE__);
+  xclose (fd);
+
+  tmp_dir = support_create_temp_directory ("tst-execveat_dir");
+  symlink_name = xasprintf ("%s/symlink", tmp_dir);
+  xsymlink ("tmp_sh", symlink_name);
+  add_temp_file (symlink_name);
+  tmp_sh = xasprintf ("%s/tmp_sh", tmp_dir);
+  add_temp_file (tmp_sh);
+  fd_out = xopen (symlink_name, O_CREAT | O_WRONLY, 0);
+  stat ("/bin/sh", &st);
+  fd = xopen ("/bin/sh", O_RDONLY, 0);
+  xcopy_file_range (fd, 0, fd_out, 0, st.st_size, 0);
+  fchmod (fd_out, 0777);
+  xclose (fd);
+  xclose (fd_out);
+  fd_out = xopen (symlink_name, O_PATH, 0);
+
+ /* Check the empty pathname. Dirfd is a symbolic link.  */
+  call_execveat (fd_out, "", 0, ENOENT, __LINE__);
+ /* Same check for an empty pathname, but the different flags.  */
+  call_execveat (fd_out, "", AT_EMPTY_PATH, 0, __LINE__);
+ /* Same check for an empty pathname, but the different flags.  */
+  call_execveat (fd_out, "", AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW, 0,
+                 __LINE__);
+  xclose (fd_out);
+  free (symlink_name);
+  free (tmp_sh);
+  free (tmp_dir);
+#endif
+
+  /* Call execveat with closed fd, we expect this to fail with EBADF  */
+  call_execveat (fd, "sh", 0, EBADF, __LINE__);
+  /* Call execveat with closed fd, we expect this to pass because the pathname is
+     absolute  */
+  call_execveat (fd, "/bin/sh", 0, 0, __LINE__);
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/posix/unistd.h b/posix/unistd.h
index 32b8161619..b1117f2eda 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -295,6 +295,11 @@  extern int euidaccess (const char *__name, int __type)
 /* An alias for `euidaccess', used by some other systems.  */
 extern int eaccess (const char *__name, int __type)
      __THROW __nonnull ((1));
+
+/* Execute program relative to a directory file descriptor.  */
+extern int execveat (int __fd, const char *__path, char *const __argv[],
+                     char *const __envp[], int __flags)
+    __THROW __nonnull ((2, 3));
 #endif
 
 #ifdef __USE_ATFILE
diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
index 7a5eb66b85..5afcd48075 100644
--- a/sysdeps/mach/hurd/i386/libc.abilist
+++ b/sysdeps/mach/hurd/i386/libc.abilist
@@ -2181,6 +2181,7 @@  GLIBC_2.3.4 xdr_quad_t F
 GLIBC_2.3.4 xdr_u_quad_t F
 GLIBC_2.30 twalk_r F
 GLIBC_2.32 __libc_single_threaded D 0x1
+GLIBC_2.32 execveat F
 GLIBC_2.32 mach_print F
 GLIBC_2.32 mremap F
 GLIBC_2.32 sigabbrev_np F
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index 4cc1c6a591..d281749621 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2155,6 +2155,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index 26ad9845e4..9bbcda105e 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2237,6 +2237,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
index 3b0a47e967..25ce4024a8 100644
--- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
@@ -139,6 +139,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
index 9ab3924888..31675a4068 100644
--- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
@@ -136,6 +136,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
index 14a84dac8f..b4b760fbc5 100644
--- a/sysdeps/unix/sysv/linux/csky/libc.abilist
+++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
@@ -2099,6 +2099,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/execveat.c b/sysdeps/unix/sysv/linux/execveat.c
new file mode 100644
index 0000000000..af3193e1d5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/execveat.c
@@ -0,0 +1,82 @@ 
+/* execveat - execute program relative to a directory file descriptor
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+#include <kernel-features.h>
+#include <fd_to_filename.h>
+#include <not-cancel.h>
+
+/* Execute the file FD refers to, overlaying the running program image.
+   ARGV and ENVP are passed to the new program, as for `execve'.  */
+int
+execveat (int dirfd, const char *path, char *const argv[], char *const envp[],
+          int flags)
+{
+    int ret;
+
+  /* Avoid implicit array coercion in syscall macros.  */
+    ret = INLINE_SYSCALL_CALL (execveat, dirfd, path, &argv[0], &envp[0], flags);
+#ifndef __ASSUME_EXECVEAT
+  if (errno != ENOSYS)
+    return ret;
+
+  if ((flags & ~(AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW)) != 0)
+    return EINVAL;
+
+  int fd;
+  if (path[0] == '\0' && (flags & AT_EMPTY_PATH) && dirfd >= 0)
+    fd = dirfd;
+  else
+    {
+      int oflags = O_CLOEXEC;
+      if (flags & AT_SYMLINK_NOFOLLOW)
+        oflags |= O_NOFOLLOW;
+      fd = __openat_nocancel (dirfd, path, oflags);
+    }
+  if (fd < 0)
+    return ret;
+
+  struct fd_to_filename fdfilename;
+  const char *gfilename = __fd_to_filename (fd, &fdfilename);
+
+  /* We do not need the return value.  */
+  __execve (gfilename, argv, envp);
+
+  int save = errno;
+
+  /* We come here only if the 'execve' call fails.  Determine whether
+     /proc is mounted.  If not we return ENOSYS.  */
+  struct stat64 st;
+  if (stat64 ("/proc/self/fd", &st) != 0 && errno == ENOENT)
+    save = ENOSYS;
+
+  if (fd != dirfd)
+    __close_nocancel_nostatus (fd);
+  __set_errno (save);
+#endif
+
+  return ret;
+}
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index 5c8502f3d3..71ddaa2930 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -2058,6 +2058,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index 4f0d3c1eb5..350687bf6f 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2224,6 +2224,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index e3b345b803..8ac4337b70 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -2090,6 +2090,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index 25f2d1c08f..425a44bc5f 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -140,6 +140,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index c4891479d3..057c77119b 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -2170,6 +2170,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
index 143b0163b4..a85ea5a0bd 100644
--- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
@@ -2150,6 +2150,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
index 13d374a031..5822ab2896 100644
--- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
@@ -2147,6 +2147,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index b2295f1937..30ead20668 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -2141,6 +2141,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index 4c786070d0..ac35f615aa 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -2139,6 +2139,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index aa9c6a4dca..76ae132755 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -2147,6 +2147,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index 5939588ad5..45ddc18ec1 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -2141,6 +2141,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index 92556c4237..3887748b90 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2188,6 +2188,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index 26c93dff05..a32a53e330 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -2197,6 +2197,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index f04b167788..a787e224fc 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -2230,6 +2230,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
index c2ca00709e..fc8a0a5e1c 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
@@ -2060,6 +2060,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
index 0ea50dc851..e1aaaedfbd 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
@@ -2350,6 +2350,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
index 1626c5351f..35a6b7829b 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
@@ -2117,6 +2117,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index a66426eb4d..efa1bb3d9e 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -2195,6 +2195,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index ab351873ae..27958ec30c 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -2096,6 +2096,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
index 22ceaa3d87..40a904ac55 100644
--- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
@@ -2065,6 +2065,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
index d36f228192..621c547e32 100644
--- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
@@ -2062,6 +2062,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index 59b4313280..f01f085b5b 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -2186,6 +2186,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index 266dcdfa08..c9225ae42e 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -2113,6 +2113,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index 4fff61818b..5e1cb8b63c 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -2071,6 +2071,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index 102ed47a9c..de1d452320 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2168,6 +2168,7 @@  GLIBC_2.32 pthread_attr_setaffinity_np F
 GLIBC_2.32 pthread_attr_setsigmask_np F
 GLIBC_2.32 pthread_getaffinity_np F
 GLIBC_2.32 pthread_getattr_np F
+GLIBC_2.33 execveat F
 GLIBC_2.32 pthread_sigmask F
 GLIBC_2.32 sigabbrev_np F
 GLIBC_2.32 sigdescr_np F