diff options
Diffstat (limited to 'drivers/misc/lkdtm/stackleak.c')
| -rw-r--r-- | drivers/misc/lkdtm/stackleak.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/misc/lkdtm/stackleak.c b/drivers/misc/lkdtm/stackleak.c index 46c60761a05e..52800583fd05 100644 --- a/drivers/misc/lkdtm/stackleak.c +++ b/drivers/misc/lkdtm/stackleak.c @@ -36,6 +36,25 @@ static void noinstr check_stackleak_irqoff(void) bool test_failed = false; /* + * Check that the current and lowest recorded stack pointer values fall + * within the expected task stack boundaries. These tests should never + * fail unless the boundaries are incorrect or we're clobbering the + * STACK_END_MAGIC, and in either casee something is seriously wrong. + */ + if (current_sp < task_stack_low || current_sp >= task_stack_high) { + pr_err("FAIL: current_stack_pointer (0x%lx) outside of task stack bounds [0x%lx..0x%lx]\n", + current_sp, task_stack_low, task_stack_high - 1); + test_failed = true; + goto out; + } + if (lowest_sp < task_stack_low || lowest_sp >= task_stack_high) { + pr_err("FAIL: current->lowest_stack (0x%lx) outside of task stack bounds [0x%lx..0x%lx]\n", + lowest_sp, task_stack_low, task_stack_high - 1); + test_failed = true; + goto out; + } + + /* * Depending on what has run prior to this test, the lowest recorded * stack pointer could be above or below the current stack pointer. * Start from the lowest of the two. @@ -87,6 +106,7 @@ static void noinstr check_stackleak_irqoff(void) poison_high - task_stack_low, task_stack_low - task_stack_base); +out: if (test_failed) { pr_err("FAIL: the thread stack is NOT properly erased!\n"); pr_expected_config(CONFIG_GCC_PLUGIN_STACKLEAK); |