diff options
| author | Kees Cook <keescook@chromium.org> | 2016-02-22 14:09:29 -0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2016-06-10 15:57:50 -0700 |
| commit | 9a49a528dcf3c2022ff89f700d5d0345b9abf288 (patch) | |
| tree | 946dc7b2e73cf54e9b349f881970d47755060c42 /drivers/misc/lkdtm_core.c | |
| parent | 426f3a53d4a1ffbe228f268e5c4af148686b7346 (diff) | |
lkdtm: add function for testing .rodata section
This adds a function that lives in the .rodata section. The section
flags are corrected using objcopy since there is no way with gcc to
declare section flags in an architecture-agnostic way.
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'drivers/misc/lkdtm_core.c')
| -rw-r--r-- | drivers/misc/lkdtm_core.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/misc/lkdtm_core.c b/drivers/misc/lkdtm_core.c index 605050c60f10..187cd9b63e9a 100644 --- a/drivers/misc/lkdtm_core.c +++ b/drivers/misc/lkdtm_core.c @@ -52,6 +52,8 @@ #include <linux/ide.h> #endif +#include "lkdtm.h" + /* * Make sure our attempts to over run the kernel stack doesn't trigger * a compiler warning when CONFIG_FRAME_WARN is set. Then make sure we @@ -103,6 +105,7 @@ enum ctype { CT_EXEC_STACK, CT_EXEC_KMALLOC, CT_EXEC_VMALLOC, + CT_EXEC_RODATA, CT_EXEC_USERSPACE, CT_ACCESS_USERSPACE, CT_WRITE_RO, @@ -145,6 +148,7 @@ static char* cp_type[] = { "EXEC_STACK", "EXEC_KMALLOC", "EXEC_VMALLOC", + "EXEC_RODATA", "EXEC_USERSPACE", "ACCESS_USERSPACE", "WRITE_RO", @@ -346,15 +350,18 @@ static noinline void corrupt_stack(void) memset((void *)data, 0, 64); } -static void noinline execute_location(void *dst) +static noinline void execute_location(void *dst, bool write) { void (*func)(void) = dst; pr_info("attempting ok execution at %p\n", do_nothing); do_nothing(); - memcpy(dst, do_nothing, EXEC_SIZE); - flush_icache_range((unsigned long)dst, (unsigned long)dst + EXEC_SIZE); + if (write) { + memcpy(dst, do_nothing, EXEC_SIZE); + flush_icache_range((unsigned long)dst, + (unsigned long)dst + EXEC_SIZE); + } pr_info("attempting bad execution at %p\n", func); func(); } @@ -551,25 +558,28 @@ static void lkdtm_do_action(enum ctype which) schedule(); break; case CT_EXEC_DATA: - execute_location(data_area); + execute_location(data_area, true); break; case CT_EXEC_STACK: { u8 stack_area[EXEC_SIZE]; - execute_location(stack_area); + execute_location(stack_area, true); break; } case CT_EXEC_KMALLOC: { u32 *kmalloc_area = kmalloc(EXEC_SIZE, GFP_KERNEL); - execute_location(kmalloc_area); + execute_location(kmalloc_area, true); kfree(kmalloc_area); break; } case CT_EXEC_VMALLOC: { u32 *vmalloc_area = vmalloc(EXEC_SIZE); - execute_location(vmalloc_area); + execute_location(vmalloc_area, true); vfree(vmalloc_area); break; } + case CT_EXEC_RODATA: + execute_location(lkdtm_rodata_do_nothing, false); + break; case CT_EXEC_USERSPACE: { unsigned long user_addr; |