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fixed ac vulnerability

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This commit is contained in:
Raoul Strackx 2019-10-21 15:10:32 +02:00
parent b7a9c285a5
commit fc50036848
1 changed files with 10 additions and 0 deletions
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10
src/libstd/sys/sgx/abi/entry.S
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@ -121,6 +121,16 @@ sgx_entry:
fnstcw %gs:tcsls_user_fcw
/* reset user state */
cld /* x86-64 ABI requires DF to be unset at function entry/exit */
/* making sure AC flag is not set in rflags */
/* avoid using the 'clac' instruction to be compatible with older compilers */
push %rcx
pushfq
popq %rcx
and $0xFFFFFFFFFFFBFFFF, %rcx
push %rcx
popfq
/* check for debug buffer pointer */
testb $0xff,DEBUG(%rip)
jz .Lskip_debug_init