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authorAmir Goldstein <amir73il@gmail.com>2018-07-13 17:22:24 +0300
committerJ. Bruce Fields <bfields@redhat.com>2018-08-09 16:11:21 -0400
commit64bed6cbe38bc95689fb9399872d9ce250192f90 (patch)
tree6376a71e746622c32818abd785c05a09593a01a8 /fs/lockd
parent8163496e78db100a6b5cfbdaece385686ae50129 (diff)
nfsd: fix leaked file lock with nfs exported overlayfs
nfsd and lockd call vfs_lock_file() to lock/unlock the inode returned by locks_inode(file). Many places in nfsd/lockd code use the inode returned by file_inode(file) for lock manipulation. With Overlayfs, file_inode() (the underlying inode) is not the same object as locks_inode() (the overlay inode). This can result in "Leaked POSIX lock" messages and eventually to a kernel crash as reported by Eddie Horng: https://marc.info/?l=linux-unionfs&m=153086643202072&w=2 Fix all the call sites in nfsd/lockd that should use locks_inode(). This is a correctness bug that manifested when overlayfs gained NFS export support in v4.16. Reported-by: Eddie Horng <eddiehorng.tw@gmail.com> Tested-by: Eddie Horng <eddiehorng.tw@gmail.com> Cc: Jeff Layton <jlayton@kernel.org> Fixes: 8383f1748829 ("ovl: wire up NFS export operations") Cc: stable@vger.kernel.org Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/lockd')
-rw-r--r--fs/lockd/clntlock.c2
-rw-r--r--fs/lockd/clntproc.c2
-rw-r--r--fs/lockd/svclock.c16
-rw-r--r--fs/lockd/svcsubs.c4
4 files changed, 12 insertions, 12 deletions
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index 96c1d14c18f1..c2a128678e6e 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -187,7 +187,7 @@ __be32 nlmclnt_grant(const struct sockaddr *addr, const struct nlm_lock *lock)
continue;
if (!rpc_cmp_addr(nlm_addr(block->b_host), addr))
continue;
- if (nfs_compare_fh(NFS_FH(file_inode(fl_blocked->fl_file)) ,fh) != 0)
+ if (nfs_compare_fh(NFS_FH(locks_inode(fl_blocked->fl_file)), fh) != 0)
continue;
/* Alright, we found a lock. Set the return status
* and wake up the caller
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index a2c0dfc6fdc0..d20b92f271c2 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -128,7 +128,7 @@ static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl)
char *nodename = req->a_host->h_rpcclnt->cl_nodename;
nlmclnt_next_cookie(&argp->cookie);
- memcpy(&lock->fh, NFS_FH(file_inode(fl->fl_file)), sizeof(struct nfs_fh));
+ memcpy(&lock->fh, NFS_FH(locks_inode(fl->fl_file)), sizeof(struct nfs_fh));
lock->caller = nodename;
lock->oh.data = req->a_owner;
lock->oh.len = snprintf(req->a_owner, sizeof(req->a_owner), "%u@%s",
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 3701bccab478..74330daeab71 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -405,8 +405,8 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
__be32 ret;
dprintk("lockd: nlmsvc_lock(%s/%ld, ty=%d, pi=%d, %Ld-%Ld, bl=%d)\n",
- file_inode(file->f_file)->i_sb->s_id,
- file_inode(file->f_file)->i_ino,
+ locks_inode(file->f_file)->i_sb->s_id,
+ locks_inode(file->f_file)->i_ino,
lock->fl.fl_type, lock->fl.fl_pid,
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end,
@@ -511,8 +511,8 @@ nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
__be32 ret;
dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n",
- file_inode(file->f_file)->i_sb->s_id,
- file_inode(file->f_file)->i_ino,
+ locks_inode(file->f_file)->i_sb->s_id,
+ locks_inode(file->f_file)->i_ino,
lock->fl.fl_type,
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end);
@@ -566,8 +566,8 @@ nlmsvc_unlock(struct net *net, struct nlm_file *file, struct nlm_lock *lock)
int error;
dprintk("lockd: nlmsvc_unlock(%s/%ld, pi=%d, %Ld-%Ld)\n",
- file_inode(file->f_file)->i_sb->s_id,
- file_inode(file->f_file)->i_ino,
+ locks_inode(file->f_file)->i_sb->s_id,
+ locks_inode(file->f_file)->i_ino,
lock->fl.fl_pid,
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end);
@@ -595,8 +595,8 @@ nlmsvc_cancel_blocked(struct net *net, struct nlm_file *file, struct nlm_lock *l
int status = 0;
dprintk("lockd: nlmsvc_cancel(%s/%ld, pi=%d, %Ld-%Ld)\n",
- file_inode(file->f_file)->i_sb->s_id,
- file_inode(file->f_file)->i_ino,
+ locks_inode(file->f_file)->i_sb->s_id,
+ locks_inode(file->f_file)->i_ino,
lock->fl.fl_pid,
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end);
diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c
index 4ec3d6e03e76..899360ba3b84 100644
--- a/fs/lockd/svcsubs.c
+++ b/fs/lockd/svcsubs.c
@@ -44,7 +44,7 @@ static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
{
- struct inode *inode = file_inode(file->f_file);
+ struct inode *inode = locks_inode(file->f_file);
dprintk("lockd: %s %s/%ld\n",
msg, inode->i_sb->s_id, inode->i_ino);
@@ -414,7 +414,7 @@ nlmsvc_match_sb(void *datap, struct nlm_file *file)
{
struct super_block *sb = datap;
- return sb == file_inode(file->f_file)->i_sb;
+ return sb == locks_inode(file->f_file)->i_sb;
}
/**