ARM: move signal handlers into a vdso-like page
Move the signal handlers into a VDSO page rather than keeping them in
the vectors page. This allows us to place them randomly within this
page, and also map the page at a random location within userspace
further protecting these code fragments from ROP attacks. The new
VDSO page is also poisoned in the same way as the vector page.
Change-Id: Ic45bb26efb1f00de0a025d36fc15dbd6580dc7de
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Git-commit: 48be69a026b2c17350a5ef18a1959a919f60be7d
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[joonwoop@codeaurora.org: fixed merge conflict]
CRs-fixed: 561044
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
diff --git a/arch/arm/include/asm/mmu.h b/arch/arm/include/asm/mmu.h
index b8e580a..cf0c81f 100644
--- a/arch/arm/include/asm/mmu.h
+++ b/arch/arm/include/asm/mmu.h
@@ -9,6 +9,7 @@
raw_spinlock_t id_lock;
#endif
unsigned int kvm_seq;
+ unsigned long sigpage;
} mm_context_t;
#ifdef CONFIG_CPU_HAS_ASID