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SGX: Clear additional flag on enclave entry #65810

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merged 4 commits into from
Oct 25, 2019
Merged

SGX: Clear additional flag on enclave entry #65810

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fc50036
fixed ac vulnerability
raoulstrackx Oct 21, 2019
d257c20
removed unnecessary push
raoulstrackx Oct 25, 2019
34f5d59
cleaning up code
raoulstrackx Oct 25, 2019
5aafa98
forgot pushfq/popqfq: fixed
raoulstrackx Oct 25, 2019
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8 changes: 7 additions & 1 deletion src/libstd/sys/sgx/abi/entry.S
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Original file line number Diff line number Diff line change
Expand Up @@ -119,8 +119,14 @@ sgx_entry:
mov %rbx,%gs:tcsls_tcs_addr
stmxcsr %gs:tcsls_user_mxcsr
fnstcw %gs:tcsls_user_fcw

/* reset user state */
cld /* x86-64 ABI requires DF to be unset at function entry/exit */
/* - DF flag: x86-64 ABI requires DF to be unset at function entry/exit */
/* - AC flag: AEX on misaligned memory accesses leaks side channel info */
pushfq
andq $~0x40400, (%rsp)
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Still need pushfq/popfq

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Of course!

popfq

/* check for debug buffer pointer */
testb $0xff,DEBUG(%rip)
jz .Lskip_debug_init
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