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| author | Vivek Goyal <vgoyal@redhat.com> | 2018-05-11 11:49:31 -0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-20 09:56:12 +0200 |
| commit | 2c3d73589adc6d3450890a6f793e5e8a1ae894e0 (patch) | |
| tree | ec83c4ebcdd9f6a0885ad9a28add2cdb78ac9321 | |
| parent | 8c444d2a971fdccda670e874f12443627f028fbc (diff) | |
| download | linux-2c3d73589adc6d3450890a6f793e5e8a1ae894e0.tar.gz linux-2c3d73589adc6d3450890a6f793e5e8a1ae894e0.tar.bz2 linux-2c3d73589adc6d3450890a6f793e5e8a1ae894e0.zip | |
ovl: Do not expose metacopy only dentry from d_real()
Metacopy dentry/inode is internal to overlay and is never exposed outside
of it. Exception is metacopy upper file used for fsync(). Modify d_real()
to look for dentries/inode which have data, but also allow matching upper
inode without data for the fsync case.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
| -rw-r--r-- | fs/overlayfs/super.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 6d22bbd5f27f..2e0fc93c2c06 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -95,10 +95,13 @@ static struct dentry *ovl_d_real(struct dentry *dentry, } real = ovl_dentry_upper(dentry); - if (real && (!inode || inode == d_inode(real))) + if (real && (inode == d_inode(real))) return real; - real = ovl_dentry_lower(dentry); + if (real && !inode && ovl_has_upperdata(d_inode(dentry))) + return real; + + real = ovl_dentry_lowerdata(dentry); if (!real) goto bug; |