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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-30 10:24:09 -0300 |
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| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-12-28 08:40:38 -0300 |
| commit | 063f9ba220f434c7f30dd65c4cff17c0c458a7cf (patch) | |
| tree | 00737e23f3b48e8d8dd338f16fc8cb98f0e6c051 /NEWS | |
| parent | 8c0664e2b861fd3789602cc0b0b1922b0e20cb3a (diff) | |
| download | glibc-063f9ba220f434c7f30dd65c4cff17c0c458a7cf.tar.gz glibc-063f9ba220f434c7f30dd65c4cff17c0c458a7cf.tar.xz glibc-063f9ba220f434c7f30dd65c4cff17c0c458a7cf.zip | |
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 'NEWS')
| -rw-r--r-- | NEWS | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/NEWS b/NEWS index 9294a7b953..ed8ac0d0df 100644 --- a/NEWS +++ b/NEWS @@ -230,6 +230,9 @@ Major new features: execute programs that do not have any dynamic dependency (that is, they are statically linked). This feature is Linux-specific. +* The audit libraries will avoid unnecessary slowdown if it is not required + PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks). + Deprecated and removed features, and other changes affecting compatibility: * The function pthread_mutex_consistent_np has been deprecated; programs |