Patchwork Update and correct SPARC configuration for supported socket syscalls

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Submitter Joseph Myers
Date Oct. 31, 2018, 9:41 p.m.
Message ID <alpine.DEB.2.21.1810312138210.17117@digraph.polyomino.org.uk>
Download mbox | patch
Permalink /patch/29985/
State Committed
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Comments

Joseph Myers - Oct. 31, 2018, 9:41 p.m.
Looking at kernel-features.h files, I saw that SPARC was missing full
information on when it gained separate socket syscalls.

This patch adds such information to the SPARC kernel-features.h.  It
also corrects what appear to be bugs in the existing code (that would
cause syscalls to be assumed to be present when not actually present);
if the reviewer agrees with my analysis I'll file a bug in Bugzilla
accordingly.  Various __ASSUME_* macros, defined by default, were not
undefined for 32-bit despite those syscalls only being added for
32-bit in Linux 4.4.  Some syscalls were used in the SPARC64
syscalls.list but only added in 4.4; this was harmless before the
__NR_* macros were defined at all, but once the macros were defined it
means a build with post-4.4 headers would assume the syscalls to be
present regardless of --enable-kernel version (this is a SPARC version
of bug 19682 which was the corresponding S/390 issue).  Then, various
__ASSUME_* macros were previously not defined in cases where they
could be defined (this part of the patch is just an optimization, not
a bug fix).

Note the observation in a comment in the patch that even the latest
Linux kernel for SPARC does not have getpeername and getsockname
syscalls in the compat syscall table for 32-bit binaries on 64-bit
kernels (so glibc can't assume those syscalls to be present for 32-bit
at all, although the 32-bit syscall table gained them in 4.4).

Tested (compilation only) for SPARC with build-many-glibcs.py.

2018-10-31  Joseph Myers  <joseph@codesourcery.com>

	* sysdeps/unix/sysv/linux/sparc/kernel-features.h [!__arch64__ &&
	__LINUX_KERNEL_VERSION < 0x040400] (__ASSUME_SENDMSG_SYSCALL):
	Undefine.
	[!__arch64__ && __LINUX_KERNEL_VERSION < 0x040400]
	(__ASSUME_RECVMSG_SYSCALL): Likewise.
	[!__arch64__ && __LINUX_KERNEL_VERSION < 0x040400]
	(__ASSUME_SENDTO_SYSCALL): Likewise.
	[!__arch64__ && __LINUX_KERNEL_VERSION < 0x040400]
	(__ASSUME_ACCEPT_SYSCALL): Undefine under this condition, not just
	[!__arch64__].
	[!__arch64__ && __LINUX_KERNEL_VERSION < 0x040400]
	(__ASSUME_CONNECT_SYSCALL): Likewise.
	[!__arch64__ && __LINUX_KERNEL_VERSION < 0x040400]
	(__ASSUME_RECVFROM_SYSCALL): Likewise.
	[__LINUX_KERNEL_VERSION >= 0x040400] (__ASSUME_BIND_SYSCALL):
	Define.
	[__LINUX_KERNEL_VERSION >= 0x040400] (__ASSUME_LISTEN_SYSCALL):
	Likewise.
	[__LINUX_KERNEL_VERSION >= 0x040400]
	(__ASSUME_SETSOCKOPT_SYSCALL): Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list (bind):
	Remove.
	(listen): Likewise.
	(setsockopt): Likewise.

Patch

diff --git a/sysdeps/unix/sysv/linux/sparc/kernel-features.h b/sysdeps/unix/sysv/linux/sparc/kernel-features.h
index 91990a716f..fd48081a77 100644
--- a/sysdeps/unix/sysv/linux/sparc/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/sparc/kernel-features.h
@@ -28,11 +28,34 @@ 
 # undef __ASSUME_SET_ROBUST_LIST
 #endif
 
-#if !defined __arch64__
+/* These syscalls were added for 32-bit in 4.4 (but present for 64-bit
+   in all supported kernel versions); the architecture-independent
+   kernel-features.h assumes some of them to be present by default.
+   getpeername and getsockname syscalls were also added for 32-bit in
+   4.4, but only for 32-bit kernels, not in the compat syscall table
+   for 64-bit kernels.  */
+#if !defined __arch64__ && __LINUX_KERNEL_VERSION < 0x040400
+# undef __ASSUME_SENDMSG_SYSCALL
+# undef __ASSUME_RECVMSG_SYSCALL
 # undef __ASSUME_ACCEPT_SYSCALL
 # undef __ASSUME_CONNECT_SYSCALL
 # undef __ASSUME_RECVFROM_SYSCALL
+# undef __ASSUME_SENDTO_SYSCALL
 #else
+# define __ASSUME_SOCKET_SYSCALL             1
+# define __ASSUME_SOCKETPAIR_SYSCALL         1
+# define __ASSUME_GETSOCKOPT_SYSCALL         1
+# define __ASSUME_SHUTDOWN_SYSCALL           1
+#endif
+
+/* These syscalls were added for both 32-bit and 64-bit in 4.4.  */
+#if __LINUX_KERNEL_VERSION >= 0x040400
+# define __ASSUME_BIND_SYSCALL               1
+# define __ASSUME_LISTEN_SYSCALL             1
+# define __ASSUME_SETSOCKOPT_SYSCALL         1
+#endif
+
+#ifdef __arch64__
 /* sparc64 defines __NR_pause,  however it is not supported (ENOSYS).
    Undefine so pause.c can use a correct alternative.  */
 # undef __NR_pause
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list b/sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list
index 33082f31eb..d30d7f2b96 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list
@@ -1,10 +1,7 @@ 
 # File name	Caller	Syscall name	# args	Strong name	Weak names
 
-bind		-	bind		3	__bind		bind
 getpeername	-	getpeername	3	__getpeername	getpeername
 getsockname	-	getsockname	3	__getsockname	getsockname
 getsockopt	-	getsockopt	5	__getsockopt	getsockopt
-listen		-	listen		2	__listen	listen
-setsockopt	-	setsockopt	5	__setsockopt	setsockopt
 shutdown	-	shutdown	2	__shutdown	shutdown
 socketpair	-	socketpair	4	__socketpair	socketpair