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glibc/glibc-RHEL-23472.patch

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commit 6a04404521ac4119ae36827eeb288ea84eee7cf6
Author: Florian Weimer <fweimer@redhat.com>
Date: Sat Feb 17 09:17:04 2024 +0100
Linux: Switch back to assembly syscall wrapper for prctl (bug 29770)
Commit ff026950e280bc3e9487b41b460fb31bc5b57721 ("Add a C wrapper for
prctl [BZ #25896]") replaced the assembler wrapper with a C function.
However, on powerpc64le-linux-gnu, the C variadic function
implementation requires extra work in the caller to set up the
parameter save area. Calling a function that needs a parameter save
area without one (because the prototype used indicates the function is
not variadic) corrupts the caller's stack. The Linux manual pages
project documents prctl as a non-variadic function. This has resulted
in various projects over the years using non-variadic prototypes,
including the sanitizer libraries in LLVm and GCC (GCC PR 113728).
This commit switches back to the assembler implementation on most
targets and only keeps the C implementation for x86-64 x32.
Also add the __prctl_time64 alias from commit
b39ffab860cd743a82c91946619f1b8158b0b65e ("Linux: Add time64 alias for
prctl") to sysdeps/unix/sysv/linux/syscalls.list; it was not yet
present in commit ff026950e280bc3e9487b41b460fb31bc5b57721.
This restores the old ABI on powerpc64le-linux-gnu, thus fixing
bug 29770.
Reviewed-By: Simon Chopin <simon.chopin@canonical.com>
Resolved conflicts:
sysdeps/unix/sysv/linux/syscalls.list
sysdeps/unix/sysv/linux/x86_64/x32/prctl.c
diff -Nrup a/sysdeps/unix/sysv/linux/prctl.c b/sysdeps/unix/sysv/linux/prctl.c
--- a/sysdeps/unix/sysv/linux/prctl.c 2021-08-01 21:33:43.000000000 -0400
+++ b/sysdeps/unix/sysv/linux/prctl.c 1969-12-31 19:00:00.000000000 -0500
@@ -1,45 +0,0 @@
-/* prctl - Linux specific syscall.
- Copyright (C) 2020-2021 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 <sysdep.h>
-#include <stdarg.h>
-#include <sys/prctl.h>
-
-/* Unconditionally read all potential arguments. This may pass
- garbage values to the kernel, but avoids the need for teaching
- glibc the argument counts of individual options (including ones
- that are added to the kernel in the future). */
-
-int
-__prctl (int option, ...)
-{
- va_list arg;
- va_start (arg, option);
- unsigned long int arg2 = va_arg (arg, unsigned long int);
- unsigned long int arg3 = va_arg (arg, unsigned long int);
- unsigned long int arg4 = va_arg (arg, unsigned long int);
- unsigned long int arg5 = va_arg (arg, unsigned long int);
- va_end (arg);
- return INLINE_SYSCALL_CALL (prctl, option, arg2, arg3, arg4, arg5);
-}
-
-libc_hidden_def (__prctl)
-weak_alias (__prctl, prctl)
-#if __TIMESIZE != 64
-weak_alias (__prctl, __prctl_time64)
-#endif
diff -Nrup a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
--- a/sysdeps/unix/sysv/linux/syscalls.list 2021-08-01 21:33:43.000000000 -0400
+++ b/sysdeps/unix/sysv/linux/syscalls.list 2024-02-27 14:33:01.594782897 -0500
@@ -41,6 +41,7 @@ munlockall - munlockall i: munlockall
nfsservctl EXTRA nfsservctl i:ipp __compat_nfsservctl nfsservctl@GLIBC_2.0:GLIBC_2.28
pipe - pipe i:f __pipe pipe
pipe2 - pipe2 i:fi __pipe2 pipe2
+prctl EXTRA prctl i:iiiii __prctl prctl __prctl_time64
pivot_root EXTRA pivot_root i:ss pivot_root
query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
quotactl EXTRA quotactl i:isip quotactl
diff -Nrup a/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c b/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c
--- a/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c 1969-12-31 19:00:00.000000000 -0500
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c 2024-02-27 14:35:03.388602623 -0500
@@ -0,0 +1,42 @@
+/* prctl - Linux specific syscall. x86-64 x32 version.
+ Copyright (C) 2020-2021 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 <sysdep.h>
+#include <stdarg.h>
+#include <sys/prctl.h>
+
+/* Unconditionally read all potential arguments. This may pass
+ garbage values to the kernel, but avoids the need for teaching
+ glibc the argument counts of individual options (including ones
+ that are added to the kernel in the future). */
+
+int
+__prctl (int option, ...)
+{
+ va_list arg;
+ va_start (arg, option);
+ unsigned long int arg2 = va_arg (arg, unsigned long int);
+ unsigned long int arg3 = va_arg (arg, unsigned long int);
+ unsigned long int arg4 = va_arg (arg, unsigned long int);
+ unsigned long int arg5 = va_arg (arg, unsigned long int);
+ va_end (arg);
+ return INLINE_SYSCALL_CALL (prctl, option, arg2, arg3, arg4, arg5);
+}
+
+libc_hidden_def (__prctl)
+weak_alias (__prctl, prctl)
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