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commit 6a04404521ac4119ae36827eeb288ea84eee7cf6
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Sat Feb 17 09:17:04 2024 +0100
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Linux: Switch back to assembly syscall wrapper for prctl (bug 29770)
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Commit ff026950e280bc3e9487b41b460fb31bc5b57721 ("Add a C wrapper for
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prctl [BZ #25896]") replaced the assembler wrapper with a C function.
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However, on powerpc64le-linux-gnu, the C variadic function
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implementation requires extra work in the caller to set up the
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parameter save area. Calling a function that needs a parameter save
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area without one (because the prototype used indicates the function is
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not variadic) corrupts the caller's stack. The Linux manual pages
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project documents prctl as a non-variadic function. This has resulted
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in various projects over the years using non-variadic prototypes,
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including the sanitizer libraries in LLVm and GCC (GCC PR 113728).
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This commit switches back to the assembler implementation on most
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targets and only keeps the C implementation for x86-64 x32.
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Also add the __prctl_time64 alias from commit
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b39ffab860cd743a82c91946619f1b8158b0b65e ("Linux: Add time64 alias for
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prctl") to sysdeps/unix/sysv/linux/syscalls.list; it was not yet
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present in commit ff026950e280bc3e9487b41b460fb31bc5b57721.
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This restores the old ABI on powerpc64le-linux-gnu, thus fixing
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bug 29770.
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Reviewed-By: Simon Chopin <simon.chopin@canonical.com>
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Resolved conflicts:
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sysdeps/unix/sysv/linux/syscalls.list
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sysdeps/unix/sysv/linux/x86_64/x32/prctl.c
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diff -Nrup a/sysdeps/unix/sysv/linux/prctl.c b/sysdeps/unix/sysv/linux/prctl.c
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--- a/sysdeps/unix/sysv/linux/prctl.c 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/unix/sysv/linux/prctl.c 1969-12-31 19:00:00.000000000 -0500
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@@ -1,45 +0,0 @@
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-/* prctl - Linux specific syscall.
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- Copyright (C) 2020-2021 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Lesser General Public License for more details.
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-
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- You should have received a copy of the GNU Lesser General Public
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- License along with the GNU C Library; if not, see
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- <https://www.gnu.org/licenses/>. */
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-
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-#include <sysdep.h>
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-#include <stdarg.h>
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-#include <sys/prctl.h>
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-
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-/* Unconditionally read all potential arguments. This may pass
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- garbage values to the kernel, but avoids the need for teaching
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- glibc the argument counts of individual options (including ones
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- that are added to the kernel in the future). */
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-
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-int
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-__prctl (int option, ...)
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-{
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- va_list arg;
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- va_start (arg, option);
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- unsigned long int arg2 = va_arg (arg, unsigned long int);
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- unsigned long int arg3 = va_arg (arg, unsigned long int);
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- unsigned long int arg4 = va_arg (arg, unsigned long int);
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- unsigned long int arg5 = va_arg (arg, unsigned long int);
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- va_end (arg);
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- return INLINE_SYSCALL_CALL (prctl, option, arg2, arg3, arg4, arg5);
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-}
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-
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-libc_hidden_def (__prctl)
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-weak_alias (__prctl, prctl)
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-#if __TIMESIZE != 64
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-weak_alias (__prctl, __prctl_time64)
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-#endif
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diff -Nrup a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
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--- a/sysdeps/unix/sysv/linux/syscalls.list 2021-08-01 21:33:43.000000000 -0400
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+++ b/sysdeps/unix/sysv/linux/syscalls.list 2024-02-27 14:33:01.594782897 -0500
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@@ -41,6 +41,7 @@ munlockall - munlockall i: munlockall
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nfsservctl EXTRA nfsservctl i:ipp __compat_nfsservctl nfsservctl@GLIBC_2.0:GLIBC_2.28
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pipe - pipe i:f __pipe pipe
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pipe2 - pipe2 i:fi __pipe2 pipe2
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+prctl EXTRA prctl i:iiiii __prctl prctl __prctl_time64
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pivot_root EXTRA pivot_root i:ss pivot_root
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query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
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quotactl EXTRA quotactl i:isip quotactl
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diff -Nrup a/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c b/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c
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--- a/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c 1969-12-31 19:00:00.000000000 -0500
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+++ b/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c 2024-02-27 14:35:03.388602623 -0500
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@@ -0,0 +1,42 @@
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+/* prctl - Linux specific syscall. x86-64 x32 version.
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+ Copyright (C) 2020-2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <sysdep.h>
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+#include <stdarg.h>
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+#include <sys/prctl.h>
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+
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+/* Unconditionally read all potential arguments. This may pass
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+ garbage values to the kernel, but avoids the need for teaching
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+ glibc the argument counts of individual options (including ones
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+ that are added to the kernel in the future). */
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+
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+int
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+__prctl (int option, ...)
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+{
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+ va_list arg;
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+ va_start (arg, option);
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+ unsigned long int arg2 = va_arg (arg, unsigned long int);
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+ unsigned long int arg3 = va_arg (arg, unsigned long int);
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+ unsigned long int arg4 = va_arg (arg, unsigned long int);
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+ unsigned long int arg5 = va_arg (arg, unsigned long int);
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+ va_end (arg);
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+ return INLINE_SYSCALL_CALL (prctl, option, arg2, arg3, arg4, arg5);
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+}
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+
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+libc_hidden_def (__prctl)
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+weak_alias (__prctl, prctl)
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Patsy Griffin