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| author | Max Filippov | 2017-03-27 11:44:47 +0200 |
|---|---|---|
| committer | Max Filippov | 2017-12-17 07:37:07 +0100 |
| commit | 40d1a07b333ef1f7fce11ee20b8f4281d1a75fb9 (patch) | |
| tree | 4855103872087025010742caa2ec0818f91f10ee /arch/xtensa/kernel | |
| parent | xtensa: print hardware config ID on startup (diff) | |
| download | kernel-qcow2-linux-40d1a07b333ef1f7fce11ee20b8f4281d1a75fb9.tar.gz kernel-qcow2-linux-40d1a07b333ef1f7fce11ee20b8f4281d1a75fb9.tar.xz kernel-qcow2-linux-40d1a07b333ef1f7fce11ee20b8f4281d1a75fb9.zip | |
xtensa: enable stack protector
The implementation is adopted from the ARM arch. GCC 7.3, 8 or newer is
required for building the xtensa kernel with SSP.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel')
| -rw-r--r-- | arch/xtensa/kernel/asm-offsets.c | 3 | ||||
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 6 | ||||
| -rw-r--r-- | arch/xtensa/kernel/process.c | 6 |
3 files changed, 15 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/asm-offsets.c b/arch/xtensa/kernel/asm-offsets.c index bcb5beb81177..3b119b372efd 100644 --- a/arch/xtensa/kernel/asm-offsets.c +++ b/arch/xtensa/kernel/asm-offsets.c @@ -76,6 +76,9 @@ int main(void) DEFINE(TASK_PID, offsetof (struct task_struct, pid)); DEFINE(TASK_THREAD, offsetof (struct task_struct, thread)); DEFINE(TASK_THREAD_INFO, offsetof (struct task_struct, stack)); +#ifdef CONFIG_CC_STACKPROTECTOR + DEFINE(TASK_STACK_CANARY, offsetof(struct task_struct, stack_canary)); +#endif DEFINE(TASK_STRUCT_SIZE, sizeof (struct task_struct)); /* offsets in thread_info struct */ diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index a27a9a65635b..5caff0744f3c 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -1971,6 +1971,12 @@ ENTRY(_switch_to) s32i a1, a2, THREAD_SP # save stack pointer #endif +#if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP) + movi a6, __stack_chk_guard + l32i a8, a3, TASK_STACK_CANARY + s32i a8, a6, 0 +#endif + /* Disable ints while we manipulate the stack pointer. */ irq_save a14, a3 diff --git a/arch/xtensa/kernel/process.c b/arch/xtensa/kernel/process.c index ff4f0ecb03dd..8dd0593fb2c4 100644 --- a/arch/xtensa/kernel/process.c +++ b/arch/xtensa/kernel/process.c @@ -58,6 +58,12 @@ void (*pm_power_off)(void) = NULL; EXPORT_SYMBOL(pm_power_off); +#ifdef CONFIG_CC_STACKPROTECTOR +#include <linux/stackprotector.h> +unsigned long __stack_chk_guard __read_mostly; +EXPORT_SYMBOL(__stack_chk_guard); +#endif + #if XTENSA_HAVE_COPROCESSORS void coprocessor_release_all(struct thread_info *ti) |