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| author | Florian Weimer <fweimer@redhat.com> | 2024-01-24 09:34:15 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2024-01-24 09:34:15 +0100 |
| commit | 486452affbac684db739b7fcca1e84e8a7ce33d1 (patch) | |
| tree | 727f4a6a62cfa2a030e4319791e395fc34046c80 /manual | |
| parent | aeb497d1feee3b50447c4b74d6934746597783ae (diff) | |
| download | glibc-486452affbac684db739b7fcca1e84e8a7ce33d1.tar.gz glibc-486452affbac684db739b7fcca1e84e8a7ce33d1.tar.xz glibc-486452affbac684db739b7fcca1e84e8a7ce33d1.zip | |
manual, NEWS: Document malloc side effect of dynamic TLS changes
The increased malloc subsystem usage is a side effect of
commit d2123d68275acc0f061e73d5f86ca504e0d5a344 ("elf: Fix slow tls
access after dlopen [BZ #19924]").
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Diffstat (limited to 'manual')
| -rw-r--r-- | manual/memory.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/manual/memory.texi b/manual/memory.texi index 258fdbd3a0..fb875f4c3c 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -1815,6 +1815,14 @@ using shared object dependencies or @code{LD_PRELOAD}. For static linking, the @code{malloc} replacement library must be linked in before linking against @code{libc.a} (explicitly or implicitly). +Care must be taken not to use functionality from @theglibc{} that uses +@code{malloc} internally. For example, the @code{fopen}, +@code{opendir}, @code{dlopen}, and @code{pthread_setspecific} functions +currently use the @code{malloc} subsystem internally. If the +replacement @code{malloc} or its dependencies use thread-local storage +(TLS), it must use the initial-exec TLS model, and not one of the +dynamic TLS variants. + @strong{Note:} Failure to provide a complete set of replacement functions (that is, all the functions used by the application, @theglibc{}, and other linked-in libraries) can lead to static linking |