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| author | Carlos O'Donell <carlos@redhat.com> | 2013-09-23 00:52:09 -0400 |
|---|---|---|
| committer | Carlos O'Donell <carlos@redhat.com> | 2013-09-23 00:52:09 -0400 |
| commit | c61b4d41c9647a54a329aa021341c0eb032b793e (patch) | |
| tree | c4a665c232a7d37786a6f3b5e3f56d0ae11480e8 /sysdeps/powerpc/powerpc32/stackguard-macros.h | |
| parent | 58a96064d193317236b740998e134b652d3d62ad (diff) | |
| download | glibc-c61b4d41c9647a54a329aa021341c0eb032b793e.tar.gz glibc-c61b4d41c9647a54a329aa021341c0eb032b793e.tar.xz glibc-c61b4d41c9647a54a329aa021341c0eb032b793e.zip | |
BZ #15754: CVE-2013-4788
The pointer guard used for pointer mangling was not initialized for static applications resulting in the security feature being disabled. The pointer guard is now correctly initialized to a random value for static applications. Existing static applications need to be recompiled to take advantage of the fix. The test tst-ptrguard1-static and tst-ptrguard1 add regression coverage to ensure the pointer guards are sufficiently random and initialized to a default value.
Diffstat (limited to 'sysdeps/powerpc/powerpc32/stackguard-macros.h')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/stackguard-macros.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc32/stackguard-macros.h b/sysdeps/powerpc/powerpc32/stackguard-macros.h index 839f6a4b9b..b3d0af830f 100644 --- a/sysdeps/powerpc/powerpc32/stackguard-macros.h +++ b/sysdeps/powerpc/powerpc32/stackguard-macros.h @@ -2,3 +2,13 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("lwz %0,-28680(2)" : "=r" (x)); x; }) + +#define POINTER_CHK_GUARD \ + ({ \ + uintptr_t x; \ + asm ("lwz %0,%1(2)" \ + : "=r" (x) \ + : "i" (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t)) \ + ); \ + x; \ + }) |