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i386: Remove CET support

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CET is only support for x86_64, this patch reverts:

  - faaee1f07e x86: Support shadow stack pointer in setjmp/longjmp.
  - be9ccd27c0 i386: Add _CET_ENDBR to indirect jump targets in
    add_n.S/sub_n.S
  - c02695d776 x86/CET: Update vfork to prevent child return
  - 5d844e1b72 i386: Enable CET support in ucontext functions
  - 124bcde683 x86: Add _CET_ENDBR to functions in crti.S
  - 562837c002 x86: Add _CET_ENDBR to functions in dl-tlsdesc.S
  - f753fa7dea x86: Support IBT and SHSTK in Intel CET [BZ #21598]
  - 825b58f3fb i386-mcount.S: Add _CET_ENDBR to _mcount and __fentry__
  - 7e119cd582 i386: Use _CET_NOTRACK in i686/memcmp.S
  - 177824e232 i386: Use _CET_NOTRACK in memcmp-sse4.S
  - 0a899af097 i386: Use _CET_NOTRACK in memcpy-ssse3-rep.S
  - 7fb613361c i386: Use _CET_NOTRACK in memcpy-ssse3.S
  - 77a8ae0948 i386: Use _CET_NOTRACK in memset-sse2-rep.S
  - 00e7b76a8f i386: Use _CET_NOTRACK in memset-sse2.S
  - 90d15dc577 i386: Use _CET_NOTRACK in strcat-sse2.S
  - f1574581c7 i386: Use _CET_NOTRACK in strcpy-sse2.S
  - 4031d7484a i386/sub_n.S: Add a missing _CET_ENDBR to indirect jump
  - target
  -
Checked on i686-linux-gnu.
This commit is contained in:
Adhemerval Zanella
2024-01-05 10:36:40 -03:00
parent b7fc4a07f2
commit 25f1e16ef0
31 changed files with 75 additions and 770 deletions
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24
sysdeps/unix/sysv/linux/i386/vfork.S
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@@ -20,6 +20,7 @@
#include <bits/errno.h>
#include <tcb-offsets.h>
/* Clone the calling process, but without copying the whole address space.
The calling process is suspended until the new process exits or is
replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
@@ -46,29 +47,6 @@ ENTRY (__vfork)
/* Branch forward if it failed. */
jae SYSCALL_ERROR_LABEL
#if SHSTK_ENABLED
/* Check if shadow stack is in use. */
xorl %edx, %edx
rdsspd %edx
testl %edx, %edx
/* Normal return if shadow stack isn't in use. */
je L(no_shstk)
testl %eax, %eax
/* In parent, normal return. */
jnz L(no_shstk)
/* NB: In child, jump back to caller via indirect branch without
popping shadow stack which is shared with parent. Keep shadow
stack mismatched so that child returns in the vfork-calling
function will trigger SIGSEGV. */
popl %ecx
cfi_adjust_cfa_offset (-4)
jmp *%ecx
L(no_shstk):
#endif
ret
PSEUDO_END (__vfork)