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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-09 15:40:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-09 15:40:50 -0700 |
| commit | 52435c86bf0f5c892804912481af7f1a5b95ff2d (patch) | |
| tree | be58d19dbe6e7b1416de613b4a8b9e3cf5efe225 /fs/overlayfs/export.c | |
| parent | 4964dd29140a44e26474dbdca559b7393aba6c39 (diff) | |
| parent | 2068cf7dfbc69c4097c95af3a0bd943ced155a76 (diff) | |
Merge tag 'ovl-update-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull overlayfs updates from Miklos Szeredi:
"Fixes:
- Resolve mount option conflicts consistently
- Sync before remount R/O
- Fix file handle encoding corner cases
- Fix metacopy related issues
- Fix an unintialized return value
- Add missing permission checks for underlying layers
Optimizations:
- Allow multipe whiteouts to share an inode
- Optimize small writes by inheriting SB_NOSEC from upper layer
- Do not call ->syncfs() multiple times for sync(2)
- Do not cache negative lookups on upper layer
- Make private internal mounts longterm"
* tag 'ovl-update-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: (27 commits)
ovl: remove unnecessary lock check
ovl: make oip->index bool
ovl: only pass ->ki_flags to ovl_iocb_to_rwf()
ovl: make private mounts longterm
ovl: get rid of redundant members in struct ovl_fs
ovl: add accessor for ofs->upper_mnt
ovl: initialize error in ovl_copy_xattr
ovl: drop negative dentry in upper layer
ovl: check permission to open real file
ovl: call secutiry hook in ovl_real_ioctl()
ovl: verify permissions in ovl_path_open()
ovl: switch to mounter creds in readdir
ovl: pass correct flags for opening real directory
ovl: fix redirect traversal on metacopy dentries
ovl: initialize OVL_UPPERDATA in ovl_lookup()
ovl: use only uppermetacopy state in ovl_lookup()
ovl: simplify setting of origin for index lookup
ovl: fix out of bounds access warning in ovl_check_fb_len()
ovl: return required buffer size for file handles
ovl: sync dirty data when remounting to ro mode
...
Diffstat (limited to 'fs/overlayfs/export.c')
| -rw-r--r-- | fs/overlayfs/export.c | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c index ed5c1078919c..8f4286450f92 100644 --- a/fs/overlayfs/export.c +++ b/fs/overlayfs/export.c @@ -204,7 +204,7 @@ static int ovl_check_encode_origin(struct dentry *dentry) * ovl_connect_layer() will try to make origin's layer "connected" by * copying up a "connectable" ancestor. */ - if (d_is_dir(dentry) && ofs->upper_mnt) + if (d_is_dir(dentry) && ovl_upper_mnt(ofs)) return ovl_connect_layer(dentry); /* Lower file handle for indexed and non-upper dir/non-dir */ @@ -231,12 +231,9 @@ static int ovl_dentry_to_fid(struct dentry *dentry, u32 *fid, int buflen) if (IS_ERR(fh)) return PTR_ERR(fh); - err = -EOVERFLOW; len = OVL_FH_LEN(fh); - if (len > buflen) - goto fail; - - memcpy(fid, fh, len); + if (len <= buflen) + memcpy(fid, fh, len); err = len; out: @@ -244,9 +241,8 @@ out: return err; fail: - pr_warn_ratelimited("failed to encode file handle (%pd2, err=%i, buflen=%d, len=%d, type=%d)\n", - dentry, err, buflen, fh ? (int)fh->fb.len : 0, - fh ? fh->fb.type : 0); + pr_warn_ratelimited("failed to encode file handle (%pd2, err=%i)\n", + dentry, err); goto out; } @@ -254,7 +250,7 @@ static int ovl_encode_fh(struct inode *inode, u32 *fid, int *max_len, struct inode *parent) { struct dentry *dentry; - int bytes = *max_len << 2; + int bytes, buflen = *max_len << 2; /* TODO: encode connectable file handles */ if (parent) @@ -264,12 +260,14 @@ static int ovl_encode_fh(struct inode *inode, u32 *fid, int *max_len, if (WARN_ON(!dentry)) return FILEID_INVALID; - bytes = ovl_dentry_to_fid(dentry, fid, bytes); + bytes = ovl_dentry_to_fid(dentry, fid, buflen); dput(dentry); if (bytes <= 0) return FILEID_INVALID; *max_len = bytes >> 2; + if (bytes > buflen) + return FILEID_INVALID; return OVL_FILEID_V1; } @@ -679,10 +677,10 @@ static struct dentry *ovl_upper_fh_to_d(struct super_block *sb, struct dentry *dentry; struct dentry *upper; - if (!ofs->upper_mnt) + if (!ovl_upper_mnt(ofs)) return ERR_PTR(-EACCES); - upper = ovl_decode_real_fh(fh, ofs->upper_mnt, true); + upper = ovl_decode_real_fh(fh, ovl_upper_mnt(ofs), true); if (IS_ERR_OR_NULL(upper)) return upper; |