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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-30 10:24:09 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-12-28 08:40:38 -0300 |
| commit | 063f9ba220f434c7f30dd65c4cff17c0c458a7cf (patch) | |
| tree | 00737e23f3b48e8d8dd338f16fc8cb98f0e6c051 /elf/rtld.c | |
| parent | 8c0664e2b861fd3789602cc0b0b1922b0e20cb3a (diff) | |
| download | glibc-063f9ba220f434c7f30dd65c4cff17c0c458a7cf.zip glibc-063f9ba220f434c7f30dd65c4cff17c0c458a7cf.tar.gz glibc-063f9ba220f434c7f30dd65c4cff17c0c458a7cf.tar.bz2 | |
elf: Avoid unnecessary slowdown from profiling with audit (BZ#15533)
The rtld-audit interfaces introduces a slowdown due to enabling
profiling instrumentation (as if LD_AUDIT implied LD_PROFILE).
However, instrumenting is only necessary if one of audit libraries
provides PLT callbacks (la_pltenter or la_pltexit symbols). Otherwise,
the slowdown can be avoided.
The following patch adjusts the logic that enables profiling to iterate
over all audit modules and check if any of those provides a PLT hook.
To keep la_symbind to work even without PLT callbacks, _dl_fixup now
calls the audit callback if the modules implements it.
Co-authored-by: Alexander Monakov <amonakov@ispras.ru>
Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 8 |
1 files changed, 1 insertions, 7 deletions
@@ -1017,13 +1017,7 @@ ERROR: audit interface '%s' requires version %d (maximum supported version %d); "la_objsearch\0" "la_objopen\0" "la_preinit\0" -#if __ELF_NATIVE_CLASS == 32 - "la_symbind32\0" -#elif __ELF_NATIVE_CLASS == 64 - "la_symbind64\0" -#else -# error "__ELF_NATIVE_CLASS must be defined" -#endif + LA_SYMBIND "\0" #define STRING(s) __STRING (s) "la_" STRING (ARCH_LA_PLTENTER) "\0" "la_" STRING (ARCH_LA_PLTEXIT) "\0" |