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From: Florian Weimer <fw@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] Linux: Switch back to assembly syscall wrapper for prctl (bug 29770) Date: Sat, 17 Feb 2024 08:17:18 +0000 (GMT) [thread overview] Message-ID: <20240217081718.3E621385AC20@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6a04404521ac4119ae36827eeb288ea84eee7cf6 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> Diff: --- sysdeps/unix/sysv/linux/syscalls.list | 1 + sysdeps/unix/sysv/linux/{ => x86_64/x32}/prctl.c | 5 +---- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list index 73e941ef89..9ac42c3436 100644 --- a/sysdeps/unix/sysv/linux/syscalls.list +++ b/sysdeps/unix/sysv/linux/syscalls.list @@ -46,6 +46,7 @@ open_tree EXTRA open_tree i:isU open_tree pipe2 - pipe2 i:fi __pipe2 pipe2 pidfd_open EXTRA pidfd_open i:iU pidfd_open pidfd_getfd EXTRA pidfd_getfd i:iiU pidfd_getfd +prctl EXTRA prctl i:iiiii __prctl prctl __prctl_time64 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:iPniU process_madvise diff --git a/sysdeps/unix/sysv/linux/prctl.c b/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c similarity index 93% rename from sysdeps/unix/sysv/linux/prctl.c rename to sysdeps/unix/sysv/linux/x86_64/x32/prctl.c index 52d234ea0d..4bf1b479a0 100644 --- a/sysdeps/unix/sysv/linux/prctl.c +++ b/sysdeps/unix/sysv/linux/x86_64/x32/prctl.c @@ -1,4 +1,4 @@ -/* prctl - Linux specific syscall. +/* prctl - Linux specific syscall. x86-64 x32 version. Copyright (C) 2020-2024 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -40,6 +40,3 @@ __prctl (int option, ...) libc_hidden_def (__prctl) weak_alias (__prctl, prctl) -#if __TIMESIZE != 64 -weak_alias (__prctl, __prctl_time64) -#endif
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