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i386: Add GLIBC_ABI_GNU_TLS version [BZ #33221] 

On i386, programs and shared libraries with __thread usage may fail
silently at run-time against glibc without the TLS run-time fix for:

https://sourceware.org/bugzilla/show_bug.cgi?id=32996

Add GLIBC_ABI_GNU_TLS version to indicate that glibc has the working
GNU TLS run-time.  Linker can add the GLIBC_ABI_GNU_TLS version to
binaries which depend on the working TLS run-time so that such programs
and shared libraries will fail to load and run at run-time against
libc.so without the GLIBC_ABI_GNU_TLS version, instead of fail silently
at random.

This fixes BZ #33221.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>
This commit is contained in:
H.J. Lu 2025-07-28 12:16:11 -07:00
parent 9df8fa397d
commit ed1b7a5a48
2 changed files with 14 additions and 0 deletions
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9
sysdeps/i386/Makefile
View File

@ -51,6 +51,15 @@ $(objpfx)tst-ld-sse-use.out: ../sysdeps/i386/tst-ld-sse-use.sh $(objpfx)ld.so
@echo "Checking ld.so for SSE register use. This will take a few seconds..."
$(BASH) $< $(objpfx) '$(NM)' '$(OBJDUMP)' '$(READELF)' > $@; \
$(evaluate-test)
tests-special += $(objpfx)check-gnu-tls.out
$(objpfx)check-gnu-tls.out: $(common-objpfx)libc.so
LC_ALL=C $(READELF) -V -W $< \
| sed -ne '/.gnu.version_d/, /.gnu.version_r/ p' \
| grep GLIBC_ABI_GNU_TLS > $@; \
$(evaluate-test)
generated += check-gnu-tls.out
else
CFLAGS-.os += $(if $(filter rtld-%.os,$(@F)), $(rtld-CFLAGS))
endif

5
sysdeps/i386/Versions
View File

@ -28,6 +28,11 @@ libc {
GLIBC_2.13 {
__fentry__;
}
GLIBC_ABI_GNU_TLS {
# This symbol is used only for empty version map and will be removed
# by scripts/versions.awk.
__placeholder_only_for_empty_version_map;
}
}
libm {
GLIBC_2.1 {