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restorer: shstk: implement shadow stack restore

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The restore of a task with shadow stack enabled adds these steps:

* switch from the default shadow stack to a temporary shadow stack
  allocated in the premmaped area
* unmap CRIU mappings; nothing changed here, but it's important that
  CRIU mappings can be removed only after switching to a temporary
  shadow stack
* create shadow stack VMA with map_shadow_stack()
* restore shadow stack contents with wrss
* switch to "real" shadow stack
* lock shadow stack features

Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
This commit is contained in:
Mike Rapoport (IBM)
2022-05-25 12:30:04 +03:00
committed by Andrei Vagin
parent 7dd5830023
commit a48aa33eaa
6 changed files with 271 additions and 7 deletions
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compel/arch/x86/plugins/std/syscalls/syscall_64.tbl
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@@ -118,3 +118,4 @@ __NR_openat2 437 sys_openat2 (int dirfd, char *pathname, struct open_how *how
__NR_pidfd_getfd 438 sys_pidfd_getfd (int pidfd, int targetfd, unsigned int flags)
__NR_rseq 334 sys_rseq (void *rseq, uint32_t rseq_len, int flags, uint32_t sig)
__NR_membarrier 324 sys_membarrier (int cmd, unsigned int flags, int cpu_id)
__NR_map_shadow_stack 453 sys_map_shadow_stack (unsigned long addr, unsigned long size, unsigned int flags)