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Subject[PATCH] fs: call security_d_instantiate in d_obtain_alias
Date
While trying to track down some NFS problems with BTRFS, I kept noticing I was
getting -EACCESS for no apparent reason. Eric Paris and printk() helped me
figure out that it was SELinux that was giving me grief, with the following
denial

type=AVC msg=audit(1290013638.413:95): avc: denied { 0x800000 } for pid=1772
comm="nfsd" name="" dev=sda1 ino=256 scontext=system_u:system_r:kernel_t:s0
tcontext=system_u:object_r:unlabeled_t:s0 tclass=file
Turns out this is because in d_obtain_alias if we can't find an alias we create
one and do all the normal instantiation stuff, but we don't do the
security_d_instantiate. With this patch I'm no longer seeing these errant
-EACCESS return values. Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
---
fs/dcache.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index 23702a9..890a59e 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1201,6 +1201,7 @@ struct dentry *d_obtain_alias(struct inode *inode)
spin_unlock(&tmp->d_lock);

spin_unlock(&dcache_lock);
+ security_d_instantiate(tmp, inode);
return tmp;

out_iput:
--
1.6.6.1


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