26 lines
1.0 KiB
Diff
26 lines
1.0 KiB
Diff
commit 947388eb043ea1c44b37df94046e1eee790ad776
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Author: Mike Crowe <mac@mcrowe.com>
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Date: Mon Sep 9 14:16:16 2019 +0100
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Intercept strncmp for glibc ld.so v2.28+
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In glibc 5aad5f617892e75d91d4c8fb7594ff35b610c042 (first released in
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v2.28) a call to strncmp was added to dl-load.c:is_dst. This causes
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valgrind to complain about glibc's highly-optimised strncmp performing
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sixteen-byte reads on short strings in ld.so. Let's intercept strncmp in
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ld.so too so we use valgrind's simple version to avoid this problem.
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diff --git a/shared/vg_replace_strmem.c b/shared/vg_replace_strmem.c
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index 3b42b3a87..5396e83be 100644
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--- a/shared/vg_replace_strmem.c
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+++ b/shared/vg_replace_strmem.c
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@@ -710,6 +710,8 @@ static inline void my_exit ( int x )
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STRNCMP(VG_Z_LIBC_SONAME, __GI_strncmp)
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STRNCMP(VG_Z_LIBC_SONAME, __strncmp_sse2)
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STRNCMP(VG_Z_LIBC_SONAME, __strncmp_sse42)
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+ STRNCMP(VG_Z_LD_LINUX_SO_2, strncmp)
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+ STRNCMP(VG_Z_LD_LINUX_X86_64_SO_2, strncmp)
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#elif defined(VGO_freebsd)
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STRNCMP(VG_Z_LIBC_SONAME, strncmp)
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