diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86/tst-cet-setcontext-1.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86/tst-cet-setcontext-1.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/sysdeps/unix/sysv/linux/x86/tst-cet-setcontext-1.c b/sysdeps/unix/sysv/linux/x86/tst-cet-setcontext-1.c index 837a9fd0eb..2ea66c803b 100644 --- a/sysdeps/unix/sysv/linux/x86/tst-cet-setcontext-1.c +++ b/sysdeps/unix/sysv/linux/x86/tst-cet-setcontext-1.c @@ -87,15 +87,14 @@ do_test (void) ctx[4].uc_link = &ctx[0]; makecontext (&ctx[4], (void (*) (void)) f1, 0); - /* NB: When shadow stack is enabled, makecontext calls arch_prctl - with ARCH_CET_ALLOC_SHSTK to allocate a new shadow stack which - can be unmapped. The base address and size of the new shadow - stack are returned in __ssp[1] and __ssp[2]. makecontext is - called for CTX1, CTX3 and CTX4. But only CTX1 is used. New - shadow stacks are allocated in the order of CTX3, CTX1, CTX4. - It is very likely that CTX1's shadow stack is placed between - CTX3 and CTX4. We munmap CTX3's and CTX4's shadow stacks to - create gaps above and below CTX1's shadow stack. We check + /* NB: When shadow stack is enabled, makecontext calls map_shadow_stack + to allocate a new shadow stack which can be unmapped. The base + address and size of the new shadow stack are returned in __ssp[1] + and __ssp[2]. makecontext is called for CTX1, CTX3 and CTX4. But + only CTX1 is used. New shadow stacks are allocated in the order + of CTX3, CTX1, CTX4. It is very likely that CTX1's shadow stack is + placed between CTX3 and CTX4. We munmap CTX3's and CTX4's shadow + stacks to create gaps above and below CTX1's shadow stack. We check that setcontext CTX1 works correctly in this case. */ if (_get_ssp () != 0) { |