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author | Florian Weimer <fweimer@redhat.com> | 2024-02-17 09:17:04 +0100 |
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committer | Florian Weimer <fweimer@redhat.com> | 2024-02-17 09:17:04 +0100 |
commit | 6a04404521ac4119ae36827eeb288ea84eee7cf6 (patch) | |
tree | 6f61723edc556c027ca4434dd3773cdae9cb1c08 /config.h.in | |
parent | 0d9166c2245cad4ac520b337dee40c9a583872b6 (diff) | |
download | glibc-6a04404521ac4119ae36827eeb288ea84eee7cf6.tar.gz glibc-6a04404521ac4119ae36827eeb288ea84eee7cf6.tar.xz glibc-6a04404521ac4119ae36827eeb288ea84eee7cf6.zip |
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>
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