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x86: Remove ARCH_CET_LEGACY_BITMAP [BZ #25397]

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Since legacy bitmap doesn't cover jitted code generated by legacy JIT
engine, it isn't very useful.  This patch removes ARCH_CET_LEGACY_BITMAP
and treats indirect branch tracking similar to shadow stack by removing
legacy bitmap support.

Tested on CET Linux/x86-64 and non-CET Linux/x86-64.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
H.J. Lu
2020-03-18 04:35:54 -07:00
parent 49348beafe
commit 1fabdb9908
10 changed files with 165 additions and 208 deletions
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5
sysdeps/unix/sysv/linux/x86/include/asm/prctl.h
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@@ -24,9 +24,4 @@
OUT: allocated shadow stack address: *addr.
*/
# define ARCH_CET_ALLOC_SHSTK 0x3004
/* Return legacy region bitmap info in unsigned long long *addr:
address: addr[0].
size: addr[1].
*/
# define ARCH_CET_LEGACY_BITMAP 0x3005
#endif /* ARCH_CET_STATUS */