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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-07-24 00:29:18 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-08-01 14:31:56 +0100 |
| commit | 48be69a026b2c17350a5ef18a1959a919f60be7d (patch) | |
| tree | 684261ce66ecd1e3f53ec1346dfa675a62477d1f /arch/arm/kernel/traps.c | |
| parent | f6f91b0d9fd971c630cef908dde8fe8795aefbf8 (diff) | |
| download | linux-48be69a026b2c17350a5ef18a1959a919f60be7d.tar.gz linux-48be69a026b2c17350a5ef18a1959a919f60be7d.tar.bz2 linux-48be69a026b2c17350a5ef18a1959a919f60be7d.zip | |
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.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/traps.c')
| -rw-r--r-- | arch/arm/kernel/traps.c | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index e3ca35ccd38e..ab517fcce21b 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -35,8 +35,6 @@ #include <asm/tls.h> #include <asm/system_misc.h> -#include "signal.h" - static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" }; void *vectors_page; @@ -850,13 +848,6 @@ void __init early_trap_init(void *vectors_base) kuser_init(vectors_base); - /* - * Copy signal return handlers into the vector page, and - * set sigreturn to be a pointer to these. - */ - memcpy((void *)(vectors + KERN_SIGRETURN_CODE - CONFIG_VECTORS_BASE), - sigreturn_codes, sizeof(sigreturn_codes)); - flush_icache_range(vectors, vectors + PAGE_SIZE * 2); modify_domain(DOMAIN_USER, DOMAIN_CLIENT); #else /* ifndef CONFIG_CPU_V7M */ |