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| author | Raoul Strackx <raoul.strackx@fortanix.com> | 2019-10-21 15:10:32 +0200 |
|---|---|---|
| committer | Raoul Strackx <raoul.strackx@fortanix.com> | 2019-10-21 15:10:32 +0200 |
| commit | fc500368485bd2ebafea6a37da30f49c8be75aac (patch) | |
| tree | 65c1cad9b6a692a9bd7f245876cb384ae7e78dbb /src | |
| parent | b7a9c285a50f3a94c44687ba9ff3ab0648243aaa (diff) | |
| download | rust-fc500368485bd2ebafea6a37da30f49c8be75aac.tar.gz rust-fc500368485bd2ebafea6a37da30f49c8be75aac.zip | |
fixed ac vulnerability
Diffstat (limited to 'src')
| -rw-r--r-- | src/libstd/sys/sgx/abi/entry.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/libstd/sys/sgx/abi/entry.S b/src/libstd/sys/sgx/abi/entry.S index c35e49b1dc6..4f8673a1907 100644 --- a/src/libstd/sys/sgx/abi/entry.S +++ b/src/libstd/sys/sgx/abi/entry.S @@ -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 |