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-rw-r--r--fs/exec.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 5ee2545c3e..f11cfd7bce 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -67,6 +67,7 @@
#include <linux/time_namespace.h>
#include <linux/user_events.h>
#include <linux/rseq.h>
+#include <linux/ksm.h>
#include <linux/uaccess.h>
#include <asm/mmu_context.h>
@@ -268,6 +269,14 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
}
/*
+ * Need to be called with mmap write lock
+ * held, to avoid race with ksmd.
+ */
+ err = ksm_execve(mm);
+ if (err)
+ goto err_ksm;
+
+ /*
* Place the stack at the largest stack address the architecture
* supports. Later, we'll move this to an appropriate place. We don't
* use STACK_TOP because that can depend on attributes which aren't
@@ -288,6 +297,8 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
bprm->p = vma->vm_end - sizeof(void *);
return 0;
err:
+ ksm_exit(mm);
+err_ksm:
mmap_write_unlock(mm);
err_free:
bprm->vma = NULL;