diff options
Diffstat (limited to 'source4/ntvfs/posix/pvfs_resolve.c')
| -rw-r--r-- | source4/ntvfs/posix/pvfs_resolve.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/source4/ntvfs/posix/pvfs_resolve.c b/source4/ntvfs/posix/pvfs_resolve.c index 97068c3d03..5b86cd3a73 100644 --- a/source4/ntvfs/posix/pvfs_resolve.c +++ b/source4/ntvfs/posix/pvfs_resolve.c @@ -364,10 +364,29 @@ NTSTATUS pvfs_resolve_partial(struct pvfs_state *pvfs, TALLOC_CTX *mem_ctx, NTSTATUS pvfs_resolve_name_fd(struct pvfs_state *pvfs, int fd, struct pvfs_filename *name) { + dev_t device; + ino_t inode; + + if (name->exists) { + device = name->st.st_dev; + inode = name->st.st_ino; + } + if (fstat(fd, &name->st) == -1) { return NT_STATUS_INVALID_HANDLE; } + if (name->exists && + (device != name->st.st_dev || inode != name->st.st_ino)) { + /* the file we are looking at has changed! this could + be someone trying to exploit a race + condition. Certainly we don't want to continue + operating on this file */ + DEBUG(0,("pvfs: WARNING: file '%s' changed during resole - failing\n", + name->full_name)); + return NT_STATUS_UNEXPECTED_IO_ERROR; + } + name->exists = True; return pvfs_fill_dos_info(pvfs, name); |