x86: Support shadow stack pointer in setjmp/longjmp
authorH.J. Lu <hjl.tools@gmail.com>
Sat, 14 Jul 2018 12:59:29 +0000 (05:59 -0700)
committerH.J. Lu <hjl.tools@gmail.com>
Sat, 14 Jul 2018 12:59:53 +0000 (05:59 -0700)
commitfaaee1f07ed25b2779bfd935ffb29f431b80d6d3
tree3c85f88e2312c67e0f0e54be10b0bec833c7541f
parentebff9c5cfae62e84dbd0456d564bd882818dc15f
x86: Support shadow stack pointer in setjmp/longjmp

Save and restore shadow stack pointer in setjmp and longjmp to support
shadow stack in Intel CET.  Use feature_1 in tcbhead_t to check if
shadow stack is enabled before saving and restoring shadow stack pointer.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* sysdeps/i386/__longjmp.S: Include <jmp_buf-ssp.h>.
(__longjmp): Restore shadow stack pointer if shadow stack is
enabled, SHADOW_STACK_POINTER_OFFSET is defined and __longjmp
isn't defined for __longjmp_cancel.
* sysdeps/i386/bsd-_setjmp.S: Include <jmp_buf-ssp.h>.
(_setjmp): Save shadow stack pointer if shadow stack is enabled
and SHADOW_STACK_POINTER_OFFSET is defined.
* sysdeps/i386/bsd-setjmp.S: Include <jmp_buf-ssp.h>.
(setjmp): Save shadow stack pointer if shadow stack is enabled
and SHADOW_STACK_POINTER_OFFSET is defined.
* sysdeps/i386/setjmp.S: Include <jmp_buf-ssp.h>.
(__sigsetjmp): Save shadow stack pointer if shadow stack is
enabled and SHADOW_STACK_POINTER_OFFSET is defined.
* sysdeps/unix/sysv/linux/i386/____longjmp_chk.S: Include
<jmp_buf-ssp.h>.
(____longjmp_chk): Restore shadow stack pointer if shadow stack
is enabled and SHADOW_STACK_POINTER_OFFSET is defined.
* sysdeps/unix/sysv/linux/x86/Makefile (gen-as-const-headers):
Remove jmp_buf-ssp.sym.
* sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S: Include
<jmp_buf-ssp.h>.
(____longjmp_chk): Restore shadow stack pointer if shadow stack
is enabled and SHADOW_STACK_POINTER_OFFSET is defined.
* sysdeps/x86/Makefile (gen-as-const-headers): Add
jmp_buf-ssp.sym.
* sysdeps/x86/jmp_buf-ssp.sym: New dummy file.
* sysdeps/x86_64/__longjmp.S: Include <jmp_buf-ssp.h>.
(__longjmp): Restore shadow stack pointer if shadow stack is
enabled, SHADOW_STACK_POINTER_OFFSET is defined and __longjmp
isn't defined for __longjmp_cancel.
* sysdeps/x86_64/setjmp.S: Include <jmp_buf-ssp.h>.
(__sigsetjmp): Save shadow stack pointer if shadow stack is
enabled and SHADOW_STACK_POINTER_OFFSET is defined.
12 files changed:
ChangeLog
sysdeps/i386/__longjmp.S
sysdeps/i386/bsd-_setjmp.S
sysdeps/i386/bsd-setjmp.S
sysdeps/i386/setjmp.S
sysdeps/unix/sysv/linux/i386/____longjmp_chk.S
sysdeps/unix/sysv/linux/x86/Makefile
sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S
sysdeps/x86/Makefile
sysdeps/x86/jmp_buf-ssp.sym [new file with mode: 0644]
sysdeps/x86_64/__longjmp.S
sysdeps/x86_64/setjmp.S