https://bugs.kde.org/show_bug.cgi?id=444278
Bug ID: 444278
Summary: SIGSEGV in musl freelocale
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: shininggat...@outlook.com
Target Milestone: ---
Created attachment 142798
--> https://bugs.kde.org/attachment.cgi?id=142798&action=edit
minimal test case
SUMMARY
When running the program `min.c` under valgrind and musl libc, the process is
terminated with SIGSEGV in `freelocale`.
STEPS TO REPRODUCE
1. Compile and run `min.c` with valgrind using musl libc.
OBSERVED RESULT
Program crashes with SIGSEGV.
EXPECTED RESULT
No crashes.
SOFTWARE/OS VERSIONS
Linux 5.10.75, Alpine Linux, musl 1.2.2
ADDITIONAL INFORMATION
The issue seems to be that musl calls `__libc_free` in freelocale, which
valgrind does not replace, leading to musl trying to read metadata that is not
present, instead getting garbage. In glibc, freelocale calls the normal `free`
function, which is correctly replaced by valgrind.
Attached is a (semi-)tested patch which replaces `__libc_free`, making the test
case and the original application run fine.
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