Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-09-20 06:53:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

mm/damon/vaddr: protect vma traversal in __damon_va_thre_regions() with rcu read lock

Browse Source 
Traversing VMAs of a given maple tree should be protected by rcu read
lock.  However, __damon_va_three_regions() is not doing the protection. 
Hold the lock.

Link: https://lkml.kernel.org/r/20240905001204.1481-1-sj@kernel.org
Fixes: d0cf3dd47f ("damon: convert __damon_va_three_regions to use the VMA iterator")
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Closes: https://lore.kernel.org/b83651a0-5b24-4206-b860-cb54ffdf209b@roeck-us.net
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2024-09-04 17:12:04 -07:00 committed by Andrew Morton
parent 0885ef4705
commit fb497d6db7
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
mm/damon/vaddr.c
View File

@ -126,6 +126,7 @@ static int __damon_va_three_regions(struct mm_struct *mm,
* If this is too slow, it can be optimised to examine the maple
* tree gaps.
*/
rcu_read_lock();
for_each_vma(vmi, vma) {
unsigned long gap;
@ -146,6 +147,7 @@ static int __damon_va_three_regions(struct mm_struct *mm,
next:
prev = vma;
}
rcu_read_unlock();
if (!sz_range(&second_gap) || !sz_range(&first_gap))
return -EINVAL;