lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2026-01-06 11:51:29 +03:00
Code Activity

x86: Remove ARCH_CET_LEGACY_BITMAP [BZ #25397]

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

20
sysdeps/unix/sysv/linux/x86/dl-cet.h
View File

@@ -18,26 +18,6 @@
#include <sys/prctl.h>
#include <asm/prctl.h>
static inline int __attribute__ ((always_inline))
dl_cet_allocate_legacy_bitmap (unsigned long *legacy_bitmap)
{
/* Allocate legacy bitmap. */
#ifdef __LP64__
return (int) INTERNAL_SYSCALL_CALL (arch_prctl,
ARCH_CET_LEGACY_BITMAP, legacy_bitmap);
#else
unsigned long long legacy_bitmap_u64[2];
int res = INTERNAL_SYSCALL_CALL (arch_prctl,
ARCH_CET_LEGACY_BITMAP, legacy_bitmap_u64);
if (res == 0)
{
legacy_bitmap[0] = legacy_bitmap_u64[0];
legacy_bitmap[1] = legacy_bitmap_u64[1];
}
return res;
#endif
}
static inline int __attribute__ ((always_inline))
dl_cet_disable_cet (unsigned int cet_feature)
{