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10f307e525
When open(2) is called with O_CREAT on a path that already exists as a
symlink, over an NFSv3 mount with a cold dcache, the kernel returns
ENXIO instead of following the symlink to its target.
Reproducer script (MNT is an NFSv3 mount, kernel is 7.1-rc6):
MNT=/mnt/export
ln -sf /tmp/target $MNT/mylink
echo 3 | sudo tee /proc/sys/vm/drop_caches # cold dcache
python3 - <<'EOF'
import os
fd = os.open('/mnt/export/mylink', os.O_WRONLY | os.O_CREAT | os.O_APPEND, 0o666)
os.close(fd)
EOF
Expected: success (follow symlink, open target)
Actual: OSError: [Errno 6] No such device or address
The bug does not trigger when the dcache is warm (e.g. after a prior
stat(2)), because lookup_open() then finds a positive dentry and skips
atomic_open entirely, leaving symlink resolution to the VFS.
Root cause:
nfs_atomic_open_v23(), registered as inode->i_op->atomic_open for
NFSv3, handles O_CREAT by sending a CREATE UNCHECKED RPC. As
implemented in nfsd3_create_file() (fs/nfsd/nfs3proc.c) and as required
by RFC 1813 (3.3.8), when the name already exists as a non-regular file
the server returns NFS3_OK with the existing object's file handle rather
than NFS3ERR_EXIST causing nfs_do_create() to return 0 with the
dentry now pointing to a symlink.
The code then unconditionally calls finish_open(), which dispatches
through inode->i_fop->open(). Symlink inodes never have i_fop set — the
VFS initialises it to &no_open_fops because POSIX requires open(2) to
follow symlinks, never open them directly. no_open() returns -ENXIO.
Fix:
After nfs_do_create() succeeds, verify the returned inode is a regular
file before calling finish_open(). If the object is not regular, return
finish_no_open(file, NULL) so the VFS follows the symlink through the
normal open path. NULL is passed because nfs_do_create() instantiates
the inode on the dentry already owned by the caller; passing dentry back
would cause atomic_open() to dput() it a second time.
!S_ISREG() is used rather than S_ISLNK() to cover any other non-regular
types a server might return.
Changes in v2:
- Pass NULL to finish_no_open() per Trond's feedback.
Fixes:
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History
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