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ntfs: fix mmap_prepare writable check for shared mappings

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Linus pointed out that checking only VMA_WRITE_BIT is incorrect.
Private writable mappings (MAP_PRIVATE) set VM_WRITE but do not
write back to the filesystem. Also, mappings that can become
writable via mprotect() (VM_MAYWRITE) must be handled.

Use vma_desc_test_all(VMA_SHARED_BIT, VMA_MAYWRITE_BIT) instead,
which matches what other filesystems do.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Namjae Jeon 2026-04-21 08:13:57 +09:00
parent 660b982305
commit 6e0152c75d
1 changed files with 1 additions and 1 deletions
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2
fs/ntfs/file.c
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@ -644,7 +644,7 @@ static int ntfs_file_mmap_prepare(struct vm_area_desc *desc)
if (NInoCompressed(NTFS_I(inode)))
return -EOPNOTSUPP;
if (vma_desc_test(desc, VMA_WRITE_BIT)) {
if (vma_desc_test_all(desc, VMA_SHARED_BIT, VMA_MAYWRITE_BIT)) {
struct inode *inode = file_inode(file);
loff_t from, to;
int err;