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On x32, the size_t parameter may be passed in the lower 32 bits of a 64-bit register with the non-zero upper 32 bits. The string/memory functions written in assembly can only use the lower 32 bits of a 64-bit register as length or must clear the upper 32 bits before using the full 64-bit register for length. This pach fixes memcmp/wmemcmp for x32. Tested on x86-64 and x32. On x86-64, libc.so is the same with and withou the fix. [BZ# 24097] CVE-2019-6488 * sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S: Use RDX_LP for length. Clear the upper 32 bits of RDX register. * sysdeps/x86_64/multiarch/memcmp-sse4.S: Likewise. * sysdeps/x86_64/multiarch/memcmp-ssse3.S: Likewise. * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memcmp and tst-size_t-wmemcmp. * sysdeps/x86_64/x32/tst-size_t-memcmp.c: New file. * sysdeps/x86_64/x32/tst-size_t-wmemcmp.c: Likewise. |
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| .. | ||
| fpu | ||
| _itoa.h | ||
| divdi3.c | ||
| dl-machine.h | ||
| ffs.c | ||
| gmp-mparam.h | ||
| Implies-after | ||
| Makefile | ||
| symbol-hacks.h | ||
| sysdep.h | ||
| test-size_t.h | ||
| tst-size_t-memchr.c | ||
| tst-size_t-memcmp.c | ||
| tst-size_t-wmemchr.c | ||
| tst-size_t-wmemcmp.c | ||