https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113728
Bug ID: 113728
Summary: libasan uses incorrect prctl prototype
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: fw at gcc dot gnu.org
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org
Target Milestone: ---
Target: powerpc64le-linux-gnu
The prctl function in glibc is variadic, but the internal prototype used by
libasan has a fixed argument list.
This causes crashes on powerpc64le-linux-gnu with current glibc because the
glibc implementation is variadic as well, it uses <stdarg.h>. Older glibc uses
an assembler implementation which does not bother with variadic arguments. For
variadic function calls, it's the caller's responsibility to set up the
parameter save area, but that does not happen if function prototype is
incorrect and non-variadic.
I'll try to get this worked around in glibc, but I couldn't get my ABI
regression fix applied the first time I posted it. The libasan library isn't
the first application impacted by the prctl ABI change.
