smb/server: deny overwriting targets with non-POSIX opens

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Reproducer:

  1. server: systemctl start ksmbd
  2. client: mount without `posix` option
     mount -t cifs //${server_ip}/export /mnt
  3. client: touch /mnt/file1 /mnt/file2
  4. client: C program: int fd = open("/mnt/file2", O_RDONLY);
  5. client: C program: rename("/mnt/file1", "/mnt/file2");
  6. client: C program: struct stat stbuf; fstat(fd, &stbuf);
                        stbuf.st_nlink is 1, should be 0

This patch fixes xfstests generic/035 when mounted without `posix` option.

Suggested-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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This commit is contained in:

ChenXiaoSong 2026-08-05 05:11:11 +00:00 • committed by Namjae Jeon

parent 1e3b4b4f77

commit 6a8292d379

3 changed files with 41 additions and 0 deletions

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13

fs/smb/server/vfs.c

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27

fs/smb/server/vfs_cache.c

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1

fs/smb/server/vfs_cache.h

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