@@ -16,6 +16,9 @@ Major new features:
* On Linux, the process_madvise has been added. It is has the same
functionality as madvise but using a pidfd of the target process.
+* On Linux, the process_mrelease has been added. It allows release the
+ memory of a dying process from the context of the caller.
+
Deprecated and removed features, and other changes affecting compatibility:
[Add deprecations, removals and changes affecting compatibility here]
@@ -128,6 +128,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
tst-scm_rights \
tst-epoll \
tst-pidfd \
+ tst-process_mrelease \
# tests
# process_madvise requires CAP_SYS_ADMIN.
@@ -304,6 +304,7 @@ libc {
pidfd_getfd;
pidfd_send_signal;
process_madvise;
+ process_mrelease;
}
GLIBC_PRIVATE {
# functions used in other libraries
@@ -2620,3 +2620,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2717,6 +2717,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2381,3 +2381,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -500,6 +500,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
@@ -497,6 +497,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
@@ -30,4 +30,6 @@ extern __ssize_t process_madvise (int __pid_fd, const struct iovec* __iov,
unsigned __flags)
__THROW;
+extern int process_mrelease (int pidfd, unsigned int flags) __THROW;
+
#endif /* __USE_GNU */
@@ -2656,3 +2656,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2605,6 +2605,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2789,6 +2789,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2555,6 +2555,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -501,6 +501,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0x98
GLIBC_2.4 _IO_2_1_stdin_ D 0x98
@@ -2732,6 +2732,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2705,3 +2705,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2702,3 +2702,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2697,6 +2697,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2695,6 +2695,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2703,6 +2703,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2606,6 +2606,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2744,3 +2744,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2127,3 +2127,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2759,6 +2759,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2792,6 +2792,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2514,6 +2514,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2816,3 +2816,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2383,3 +2383,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2583,3 +2583,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
@@ -2757,6 +2757,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2551,6 +2551,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2612,6 +2612,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2609,6 +2609,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2752,6 +2752,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2578,6 +2578,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -44,6 +44,7 @@ pidfd_getfd EXTRA pidfd_getfd i:iiU pidfd_getfd
pivot_root EXTRA pivot_root i:ss pivot_root
pidfd_send_signal EXTRA pidfd_send_signal i:iiPU pidfd_send_signal
process_madvise EXTRA process_madvise i:iPiiU process_madvise
+process_mrelease EXTRA process_mrelease i:iU process_mrelease
query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
quotactl EXTRA quotactl i:isip quotactl
remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages
new file mode 100644
@@ -0,0 +1,72 @@
+/* Basic tests for Linux process_mrelease.
+ Copyright (C) 2022 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 <support/check.h>
+#include <support/xunistd.h>
+#include <support/xsocket.h>
+#include <sys/pidfd.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+
+static void
+subprocess (void)
+{
+ pause ();
+ _exit (0);
+}
+
+static int
+do_test (void)
+{
+ {
+ int r = process_mrelease (-1, 0);
+ TEST_COMPARE (r, -1);
+ if (errno == ENOSYS)
+ FAIL_UNSUPPORTED ("kernel does not support process_mrelease, "
+ "skipping test");
+ TEST_COMPARE (errno, EBADF);
+ }
+
+ pid_t pid = xfork ();
+ if (pid == 0)
+ subprocess ();
+
+ int pidfd = pidfd_open (pid, 0);
+ TEST_VERIFY (pidfd != -1);
+
+ /* The syscall only succeedes if the target process is exiting and there
+ is no guarantee that calling if after pidfd_send_signal will not error
+ (since the process might already been reaped by OS). So just check if
+ it does fail when the process is stll running. */
+ TEST_COMPARE (process_mrelease (pidfd, 0), -1);
+ TEST_COMPARE (errno, EINVAL);
+
+ TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), 0);
+ {
+ siginfo_t info;
+ int r = waitid (P_PIDFD, pidfd, &info, WEXITED);
+ TEST_COMPARE (r, 0);
+ TEST_COMPARE (info.si_status, SIGKILL);
+ TEST_COMPARE (info.si_code, CLD_KILLED);
+ }
+
+ return 0;
+}
+
+#include <support/test-driver.c>
@@ -2529,6 +2529,7 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2635,3 +2635,4 @@ GLIBC_2.36 pidfd_getfd F
GLIBC_2.36 pidfd_open F
GLIBC_2.36 pidfd_send_signal F
GLIBC_2.36 process_madvise F
+GLIBC_2.36 process_mrelease F