diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2013-03-26 18:25:57 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-04-10 03:20:03 +0100 |
| commit | a0a551fcc3199a6e9fb6c0236daff99bbe278905 (patch) | |
| tree | 97b3159b14cfa14400549672f7501f00340414ba /fs | |
| parent | 509d8d1dcefb35111b3f1e24f56be7d956cef439 (diff) | |
Nest rename_lock inside vfsmount_lock
commit 7ea600b5314529f9d1b9d6d3c41cb26fce6a7a4a upstream.
... lest we get livelocks between path_is_under() and d_path() and friends.
The thing is, wrt fairness lglocks are more similar to rwsems than to rwlocks;
it is possible to have thread B spin on attempt to take lock shared while thread
A is already holding it shared, if B is on lower-numbered CPU than A and there's
a thread C spinning on attempt to take the same lock exclusive.
As the result, we need consistent ordering between vfsmount_lock (lglock) and
rename_lock (seq_lock), even though everything that takes both is going to take
vfsmount_lock only shared.
Spotted-by: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[bwh: Backported to 3.2:
- Adjust context
- s/&vfsmount_lock/vfsmount_lock/]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/dcache.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index bb7f4ccdfbd..e923bf4a84a 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -2445,7 +2445,6 @@ static int prepend_path(const struct path *path, bool slash = false; int error = 0; - br_read_lock(vfsmount_lock); while (dentry != root->dentry || vfsmnt != root->mnt) { struct dentry * parent; @@ -2475,8 +2474,6 @@ static int prepend_path(const struct path *path, if (!error && !slash) error = prepend(buffer, buflen, "/", 1); -out: - br_read_unlock(vfsmount_lock); return error; global_root: @@ -2493,7 +2490,7 @@ global_root: error = prepend(buffer, buflen, "/", 1); if (!error) error = vfsmnt->mnt_ns ? 1 : 2; - goto out; + return error; } /** @@ -2520,9 +2517,11 @@ char *__d_path(const struct path *path, int error; prepend(&res, &buflen, "\0", 1); + br_read_lock(vfsmount_lock); write_seqlock(&rename_lock); error = prepend_path(path, root, &res, &buflen); write_sequnlock(&rename_lock); + br_read_unlock(vfsmount_lock); if (error < 0) return ERR_PTR(error); @@ -2539,9 +2538,11 @@ char *d_absolute_path(const struct path *path, int error; prepend(&res, &buflen, "\0", 1); + br_read_lock(vfsmount_lock); write_seqlock(&rename_lock); error = prepend_path(path, &root, &res, &buflen); write_sequnlock(&rename_lock); + br_read_unlock(vfsmount_lock); if (error > 1) error = -EINVAL; @@ -2605,11 +2606,13 @@ char *d_path(const struct path *path, char *buf, int buflen) return path->dentry->d_op->d_dname(path->dentry, buf, buflen); get_fs_root(current->fs, &root); + br_read_lock(vfsmount_lock); write_seqlock(&rename_lock); error = path_with_deleted(path, &root, &res, &buflen); + write_sequnlock(&rename_lock); + br_read_unlock(vfsmount_lock); if (error < 0) res = ERR_PTR(error); - write_sequnlock(&rename_lock); path_put(&root); return res; } @@ -2764,6 +2767,7 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size) get_fs_root_and_pwd(current->fs, &root, &pwd); error = -ENOENT; + br_read_lock(vfsmount_lock); write_seqlock(&rename_lock); if (!d_unlinked(pwd.dentry)) { unsigned long len; @@ -2773,6 +2777,7 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size) prepend(&cwd, &buflen, "\0", 1); error = prepend_path(&pwd, &root, &cwd, &buflen); write_sequnlock(&rename_lock); + br_read_unlock(vfsmount_lock); if (error < 0) goto out; @@ -2793,6 +2798,7 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size) } } else { write_sequnlock(&rename_lock); + br_read_unlock(vfsmount_lock); } out: |