From: "Kirill A. Shutemov" <[email protected]>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 461c7fa126794157484dca48e88effa4963e3af3 upstream.
Reduced testcase:
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <numaif.h>
#define SIZE 0x2000
int main()
{
int fd;
void *p;
fd = open("/dev/sg0", O_RDWR);
p = mmap(NULL, SIZE, PROT_EXEC, MAP_PRIVATE | MAP_LOCKED, fd, 0);
mbind(p, SIZE, 0, NULL, 0, MPOL_MF_MOVE);
return 0;
}
We shouldn't try to migrate pages in sg VMA as we don't have a way to
update Sg_scatter_hold::pages accordingly from mm core.
Let's mark the VMA as VM_IO to indicate to mm core that the VMA is not
migratable.
Signed-off-by: Kirill A. Shutemov <[email protected]>
Reported-by: Dmitry Vyukov <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Doug Gilbert <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Shiraz Hashim <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Sasha Levin <[email protected]>
Cc: syzkaller <[email protected]>
Cc: Kostya Serebryany <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: James Bottomley <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
---
drivers/scsi/sg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 721d839d6c54..0be16bf5f0cd 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1258,7 +1258,7 @@ sg_mmap(struct file *filp, struct vm_area_struct *vma)
}
sfp->mmap_called = 1;
- vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+ vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_private_data = sfp;
vma->vm_ops = &sg_mmap_vm_ops;
return 0;
--
2.7.1
