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Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/uprobes.c2
-rw-r--r--kernel/fork.c4
-rw-r--r--kernel/sysctl.c2
3 files changed, 6 insertions, 2 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index c74761004ee5..ece7e13f6e4a 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1457,7 +1457,7 @@ static int xol_add_vma(struct mm_struct *mm, struct xol_area *area)
/* Try to map as high as possible, this is only a hint. */
area->vaddr = get_unmapped_area(NULL, TASK_SIZE - PAGE_SIZE,
PAGE_SIZE, 0, 0);
- if (area->vaddr & ~PAGE_MASK) {
+ if (IS_ERR_VALUE(area->vaddr)) {
ret = area->vaddr;
goto fail;
}
diff --git a/kernel/fork.c b/kernel/fork.c
index 0f0bac8318dd..21c6c1e29b98 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -93,6 +93,7 @@
#include <linux/livepatch.h>
#include <linux/thread_info.h>
#include <linux/stackleak.h>
+#include <linux/kasan.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@@ -223,6 +224,9 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
if (!s)
continue;
+ /* Clear the KASAN shadow of the stack. */
+ kasan_unpoison_shadow(s->addr, THREAD_SIZE);
+
/* Clear stale pointers from reused stack. */
memset(s->addr, 0, THREAD_SIZE);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index b6f2f35d0bcf..70665934d53e 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1466,7 +1466,7 @@ static struct ctl_table vm_table[] = {
.procname = "drop_caches",
.data = &sysctl_drop_caches,
.maxlen = sizeof(int),
- .mode = 0644,
+ .mode = 0200,
.proc_handler = drop_caches_sysctl_handler,
.extra1 = SYSCTL_ONE,
.extra2 = &four,