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authorDmitry Vyukov <dvyukov@google.com>2015-09-21 09:43:06 +0200
committerJeff Layton <jeff.layton@primarydata.com>2015-09-21 07:27:35 -0400
commit128a37852234c1bd68eee4e7447f5362778009b8 (patch)
tree8f03feb85b58f1de45dff01387ac2736fc971585 /fs/locks.c
parentd11797a0a7acc1fe6a51b1605e166adad04da29b (diff)
downloadlinux-128a37852234c1bd68eee4e7447f5362778009b8.tar.bz2
fs: fix data races on inode->i_flctx
locks_get_lock_context() uses cmpxchg() to install i_flctx. cmpxchg() is a release operation which is correct. But it uses a plain load to load i_flctx. This is incorrect. Subsequent loads from i_flctx can hoist above the load of i_flctx pointer itself and observe uninitialized garbage there. This in turn can lead to corruption of ctx->flc_lock and other members. Documentation/memory-barriers.txt explicitly requires to use a barrier in such context: "A load-load control dependency requires a full read memory barrier". Use smp_load_acquire() in locks_get_lock_context() and in bunch of other functions that can proceed concurrently with locks_get_lock_context(). The data race was found with KernelThreadSanitizer (KTSAN). Signed-off-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c63
1 files changed, 36 insertions, 27 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 2a54c800a223..316e474c5fdb 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -205,28 +205,32 @@ static struct kmem_cache *filelock_cache __read_mostly;
static struct file_lock_context *
locks_get_lock_context(struct inode *inode, int type)
{
- struct file_lock_context *new;
+ struct file_lock_context *ctx;
- if (likely(inode->i_flctx) || type == F_UNLCK)
+ /* paired with cmpxchg() below */
+ ctx = smp_load_acquire(&inode->i_flctx);
+ if (likely(ctx) || type == F_UNLCK)
goto out;
- new = kmem_cache_alloc(flctx_cache, GFP_KERNEL);
- if (!new)
+ ctx = kmem_cache_alloc(flctx_cache, GFP_KERNEL);
+ if (!ctx)
goto out;
- spin_lock_init(&new->flc_lock);
- INIT_LIST_HEAD(&new->flc_flock);
- INIT_LIST_HEAD(&new->flc_posix);
- INIT_LIST_HEAD(&new->flc_lease);
+ spin_lock_init(&ctx->flc_lock);
+ INIT_LIST_HEAD(&ctx->flc_flock);
+ INIT_LIST_HEAD(&ctx->flc_posix);
+ INIT_LIST_HEAD(&ctx->flc_lease);
/*
* Assign the pointer if it's not already assigned. If it is, then
* free the context we just allocated.
*/
- if (cmpxchg(&inode->i_flctx, NULL, new))
- kmem_cache_free(flctx_cache, new);
+ if (cmpxchg(&inode->i_flctx, NULL, ctx)) {
+ kmem_cache_free(flctx_cache, ctx);
+ ctx = smp_load_acquire(&inode->i_flctx);
+ }
out:
- return inode->i_flctx;
+ return ctx;
}
void
@@ -762,7 +766,7 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
struct file_lock_context *ctx;
struct inode *inode = file_inode(filp);
- ctx = inode->i_flctx;
+ ctx = smp_load_acquire(&inode->i_flctx);
if (!ctx || list_empty_careful(&ctx->flc_posix)) {
fl->fl_type = F_UNLCK;
return;
@@ -1203,7 +1207,7 @@ int locks_mandatory_locked(struct file *file)
struct file_lock_context *ctx;
struct file_lock *fl;
- ctx = inode->i_flctx;
+ ctx = smp_load_acquire(&inode->i_flctx);
if (!ctx || list_empty_careful(&ctx->flc_posix))
return 0;
@@ -1388,7 +1392,7 @@ any_leases_conflict(struct inode *inode, struct file_lock *breaker)
int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
{
int error = 0;
- struct file_lock_context *ctx = inode->i_flctx;
+ struct file_lock_context *ctx;
struct file_lock *new_fl, *fl, *tmp;
unsigned long break_time;
int want_write = (mode & O_ACCMODE) != O_RDONLY;
@@ -1400,6 +1404,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
new_fl->fl_flags = type;
/* typically we will check that ctx is non-NULL before calling */
+ ctx = smp_load_acquire(&inode->i_flctx);
if (!ctx) {
WARN_ON_ONCE(1);
return error;
@@ -1494,9 +1499,10 @@ EXPORT_SYMBOL(__break_lease);
void lease_get_mtime(struct inode *inode, struct timespec *time)
{
bool has_lease = false;
- struct file_lock_context *ctx = inode->i_flctx;
+ struct file_lock_context *ctx;
struct file_lock *fl;
+ ctx = smp_load_acquire(&inode->i_flctx);
if (ctx && !list_empty_careful(&ctx->flc_lease)) {
spin_lock(&ctx->flc_lock);
if (!list_empty(&ctx->flc_lease)) {
@@ -1543,10 +1549,11 @@ int fcntl_getlease(struct file *filp)
{
struct file_lock *fl;
struct inode *inode = file_inode(filp);
- struct file_lock_context *ctx = inode->i_flctx;
+ struct file_lock_context *ctx;
int type = F_UNLCK;
LIST_HEAD(dispose);
+ ctx = smp_load_acquire(&inode->i_flctx);
if (ctx && !list_empty_careful(&ctx->flc_lease)) {
spin_lock(&ctx->flc_lock);
time_out_leases(file_inode(filp), &dispose);
@@ -1713,9 +1720,10 @@ static int generic_delete_lease(struct file *filp, void *owner)
struct file_lock *fl, *victim = NULL;
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
- struct file_lock_context *ctx = inode->i_flctx;
+ struct file_lock_context *ctx;
LIST_HEAD(dispose);
+ ctx = smp_load_acquire(&inode->i_flctx);
if (!ctx) {
trace_generic_delete_lease(inode, NULL);
return error;
@@ -2359,13 +2367,14 @@ out:
void locks_remove_posix(struct file *filp, fl_owner_t owner)
{
struct file_lock lock;
- struct file_lock_context *ctx = file_inode(filp)->i_flctx;
+ struct file_lock_context *ctx;
/*
* If there are no locks held on this file, we don't need to call
* posix_lock_file(). Another process could be setting a lock on this
* file at the same time, but we wouldn't remove that lock anyway.
*/
+ ctx = smp_load_acquire(&file_inode(filp)->i_flctx);
if (!ctx || list_empty(&ctx->flc_posix))
return;
@@ -2389,7 +2398,7 @@ EXPORT_SYMBOL(locks_remove_posix);
/* The i_flctx must be valid when calling into here */
static void
-locks_remove_flock(struct file *filp)
+locks_remove_flock(struct file *filp, struct file_lock_context *flctx)
{
struct file_lock fl = {
.fl_owner = filp,
@@ -2400,7 +2409,6 @@ locks_remove_flock(struct file *filp)
.fl_end = OFFSET_MAX,
};
struct inode *inode = file_inode(filp);
- struct file_lock_context *flctx = inode->i_flctx;
if (list_empty(&flctx->flc_flock))
return;
@@ -2416,10 +2424,8 @@ locks_remove_flock(struct file *filp)
/* The i_flctx must be valid when calling into here */
static void
-locks_remove_lease(struct file *filp)
+locks_remove_lease(struct file *filp, struct file_lock_context *ctx)
{
- struct inode *inode = file_inode(filp);
- struct file_lock_context *ctx = inode->i_flctx;
struct file_lock *fl, *tmp;
LIST_HEAD(dispose);
@@ -2439,17 +2445,20 @@ locks_remove_lease(struct file *filp)
*/
void locks_remove_file(struct file *filp)
{
- if (!file_inode(filp)->i_flctx)
+ struct file_lock_context *ctx;
+
+ ctx = smp_load_acquire(&file_inode(filp)->i_flctx);
+ if (!ctx)
return;
/* remove any OFD locks */
locks_remove_posix(filp, filp);
/* remove flock locks */
- locks_remove_flock(filp);
+ locks_remove_flock(filp, ctx);
/* remove any leases */
- locks_remove_lease(filp);
+ locks_remove_lease(filp, ctx);
}
/**
@@ -2616,7 +2625,7 @@ void show_fd_locks(struct seq_file *f,
struct file_lock_context *ctx;
int id = 0;
- ctx = inode->i_flctx;
+ ctx = smp_load_acquire(&inode->i_flctx);
if (!ctx)
return;