mirror of
https://sourceware.org/git/glibc.git
synced 2025-01-04 00:31:09 +00:00
82d0b4a4d7
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 memset/wmemset 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/memset-avx512-no-vzeroupper.S: Use RDX_LP for length. Clear the upper 32 bits of RDX register. * sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S: Likewise. * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-wmemset. * sysdeps/x86_64/x32/tst-size_t-memset.c: New file. * sysdeps/x86_64/x32/tst-size_t-wmemset.c: Likewise.
16 lines
505 B
Makefile
16 lines
505 B
Makefile
ifeq ($(subdir),math)
|
|
# Since x32 returns 32-bit long int and 64-bit long long int in the
|
|
# same 64-bit register, we make the 32b-bit lround an alias of the
|
|
# 64-bit llround. Add -fno-builtin-lround to silence the compiler.
|
|
CFLAGS-s_llround.c += -fno-builtin-lround
|
|
endif
|
|
|
|
ifeq ($(subdir),string)
|
|
tests += tst-size_t-memchr tst-size_t-memcmp tst-size_t-memcpy \
|
|
tst-size_t-memrchr tst-size_t-memset
|
|
endif
|
|
|
|
ifeq ($(subdir),wcsmbs)
|
|
tests += tst-size_t-wmemchr tst-size_t-wmemcmp tst-size_t-wmemset
|
|
endif
|