diff mbox series

[v2,1/6] mm/util: Assign a meaningful value to mmap_legacy_base

Message ID 20211011143150.318239-2-sxwjean@me.com (mailing list archive)
State New
Headers show
Series Use generic code for randomization of virtual address of x86 | expand

Commit Message

Xiongwei Song Oct. 11, 2021, 2:31 p.m. UTC 
From: Xiongwei Song <sxwjean@gmail.com>

Let's assign a value to mmap_legacy_base in case the mmap() of some
archs needs mmap_legacy_base, like x86.

Signed-off-by: Xiongwei Song <sxwjean@gmail.com>
---
 mm/util.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/mm/util.c b/mm/util.c
index e58151a61255..40b1a8837c0b 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -414,7 +414,8 @@  void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
 		random_factor = arch_mmap_rnd();
 
 	if (mmap_is_legacy(rlim_stack)) {
-		mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
+		mm->mmap_legacy_base = TASK_UNMAPPED_BASE + random_factor;
+		mm->mmap_base = mm->mmap_legacy_base;
 		mm->get_unmapped_area = arch_get_unmapped_area;
 	} else {
 		mm->mmap_base = mmap_base(random_factor, rlim_stack);