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authorHelge Deller <deller@gmx.de>2021-10-05 00:05:43 +0200
committerHelge Deller <deller@gmx.de>2021-10-30 23:11:01 +0200
commit9cc2fa4f4a92ccc6760d764e7341be46ee8aaaa1 (patch)
treecb3368f6307e23dfeff358ea3188da6db19b35ab /include/linux/sched
parentf06d6e92c879f0e3b1577d02cfaeeb8c7d4ed37a (diff)
task_stack: Fix end_of_stack() for architectures with upwards-growing stack
The function end_of_stack() returns a pointer to the last entry of a stack. For architectures like parisc where the stack grows upwards return the pointer to the highest address in the stack. Without this change I faced a crash on parisc, because the stackleak functionality wrote STACKLEAK_POISON to the lowest address and thus overwrote the first 4 bytes of the task_struct which included the TIF_FLAGS. Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'include/linux/sched')
-rw-r--r--include/linux/sched/task_stack.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched/task_stack.h b/include/linux/sched/task_stack.h
index 2413427e439c..d10150587d81 100644
--- a/include/linux/sched/task_stack.h
+++ b/include/linux/sched/task_stack.h
@@ -25,7 +25,11 @@ static inline void *task_stack_page(const struct task_struct *task)
static inline unsigned long *end_of_stack(const struct task_struct *task)
{
+#ifdef CONFIG_STACK_GROWSUP
+ return (unsigned long *)((unsigned long)task->stack + THREAD_SIZE) - 1;
+#else
return task->stack;
+#endif
}
#elif !defined(__HAVE_THREAD_FUNCTIONS)