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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-01-17 04:31:51 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-01-17 04:32:04 -0800 |
| commit | 207a72e2988c6d6343f50fe0128eb4fc4edfdd15 (patch) | |
| tree | b11cfa7687fa75d2a003a36d9e0e6ed6548b0ea9 /sysdeps/x86_64 | |
| parent | 4942c4ea48099b4ba9dfecf7cfbc452ae74811b5 (diff) | |
| download | glibc-207a72e2988c6d6343f50fe0128eb4fc4edfdd15.tar.gz glibc-207a72e2988c6d6343f50fe0128eb4fc4edfdd15.tar.xz glibc-207a72e2988c6d6343f50fe0128eb4fc4edfdd15.zip | |
x86-64: Properly align La_x86_64_retval to VEC_SIZE [BZ #22715]
_dl_runtime_profile calls _dl_call_pltexit, passing a pointer to La_x86_64_retval which is allocated on stack. The lrv_vector0 field in La_x86_64_retval must be aligned to size of vector register. When allocating stack space for La_x86_64_retval, we need to make sure that the address of La_x86_64_retval + RV_VECTOR0_OFFSET is aligned to VEC_SIZE. This patch checks the alignment of the lrv_vector0 field and pads the stack space if needed. Tested with x32 and x86-64 on SSE4, AVX and AVX512 machines. It fixed FAIL: elf/tst-audit10 FAIL: elf/tst-audit4 FAIL: elf/tst-audit5 FAIL: elf/tst-audit6 FAIL: elf/tst-audit7 on x32 AVX512 machine. [BZ #22715] * sysdeps/x86_64/dl-trampoline.h (_dl_runtime_profile): Properly align La_x86_64_retval to VEC_SIZE.
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/dl-trampoline.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/sysdeps/x86_64/dl-trampoline.h b/sysdeps/x86_64/dl-trampoline.h index 15edf49674..298cfb3d99 100644 --- a/sysdeps/x86_64/dl-trampoline.h +++ b/sysdeps/x86_64/dl-trampoline.h @@ -440,8 +440,16 @@ _dl_runtime_profile: # ifdef RESTORE_AVX /* sizeof(La_x86_64_retval). Need extra space for 2 SSE registers to detect if xmm0/xmm1 registers are changed - by audit module. */ - sub $(LRV_SIZE + XMM_SIZE*2), %RSP_LP + by audit module. Since rsp is aligned to VEC_SIZE, we + need to make sure that the address of La_x86_64_retval + + LRV_VECTOR0_OFFSET is aligned to VEC_SIZE. */ +# define LRV_SPACE (LRV_SIZE + XMM_SIZE*2) +# define LRV_MISALIGNED ((LRV_SIZE + LRV_VECTOR0_OFFSET) & (VEC_SIZE - 1)) +# if LRV_MISALIGNED == 0 + sub $LRV_SPACE, %RSP_LP +# else + sub $(LRV_SPACE + VEC_SIZE - LRV_MISALIGNED), %RSP_LP +# endif # else sub $LRV_SIZE, %RSP_LP # sizeof(La_x86_64_retval) # endif |