From 9f631f4e9e409f76f8174e6c785056e9b2b89b42 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 6 Jun 2006 11:19:35 -0400 Subject: [PATCH] fs/namei.c: Call to file_permission() under a spinlock in do_lookup_path() We're presently running lock_kernel() under fs_lock via nfs's ->permission handler. That's a ranking bug and sometimes a sleep-in-spinlock bug. This problem was introduced in the openat() patchset. We should not need to hold the current->fs->lock for a codepath that doesn't use current->fs. [vsu@altlinux.ru: fix error path] Signed-off-by: Trond Myklebust Cc: Al Viro Signed-off-by: Sergey Vlasov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Chris Wright Signed-off-by: Greg Kroah-Hartman --- fs/namei.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index 366fc51a4c0b..f11c0aa22938 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1077,8 +1077,8 @@ static int fastcall do_path_lookup(int dfd, const char *name, nd->flags = flags; nd->depth = 0; - read_lock(¤t->fs->lock); if (*name=='/') { + read_lock(¤t->fs->lock); if (current->fs->altroot && !(nd->flags & LOOKUP_NOALT)) { nd->mnt = mntget(current->fs->altrootmnt); nd->dentry = dget(current->fs->altroot); @@ -1089,33 +1089,35 @@ static int fastcall do_path_lookup(int dfd, const char *name, } nd->mnt = mntget(current->fs->rootmnt); nd->dentry = dget(current->fs->root); + read_unlock(¤t->fs->lock); } else if (dfd == AT_FDCWD) { + read_lock(¤t->fs->lock); nd->mnt = mntget(current->fs->pwdmnt); nd->dentry = dget(current->fs->pwd); + read_unlock(¤t->fs->lock); } else { struct dentry *dentry; file = fget_light(dfd, &fput_needed); retval = -EBADF; if (!file) - goto unlock_fail; + goto out_fail; dentry = file->f_dentry; retval = -ENOTDIR; if (!S_ISDIR(dentry->d_inode->i_mode)) - goto fput_unlock_fail; + goto fput_fail; retval = file_permission(file, MAY_EXEC); if (retval) - goto fput_unlock_fail; + goto fput_fail; nd->mnt = mntget(file->f_vfsmnt); nd->dentry = dget(dentry); fput_light(file, fput_needed); } - read_unlock(¤t->fs->lock); current->total_link_count = 0; retval = link_path_walk(name, nd); out: @@ -1124,13 +1126,12 @@ out: nd->dentry->d_inode)) audit_inode(name, nd->dentry->d_inode, flags); } +out_fail: return retval; -fput_unlock_fail: +fput_fail: fput_light(file, fput_needed); -unlock_fail: - read_unlock(¤t->fs->lock); - return retval; + goto out_fail; } int fastcall path_lookup(const char *name, unsigned int flags, -- cgit v1.2.3