The patch titled
r/o bind mounts: elevate write count for do_sys_utime() and touch_atime()
has been added to the -mm tree. Its filename is
ro-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: r/o bind mounts: elevate write count for do_sys_utime() and touch_atime()
From: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx>
Cc: Serge Hallyn <serue@xxxxxxxxxx>
Cc: Herbert Poetzl <herbert@xxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/inode.c | 9 +++++++--
fs/open.c | 16 +++++++++++-----
2 files changed, 18 insertions(+), 7 deletions(-)
diff -puN fs/inode.c~ro-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime fs/inode.c
--- a/fs/inode.c~ro-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime
+++ a/fs/inode.c
@@ -1187,10 +1187,13 @@ void touch_atime(struct vfsmount *mnt, s
if (IS_RDONLY(inode))
return;
+ if (!mnt_want_write(mnt))
+ return;
+
if ((inode->i_flags & S_NOATIME) ||
(inode->i_sb->s_flags & MS_NOATIME) ||
((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
- return;
+ goto out;
/*
* We may have a NULL vfsmount when coming from NFSD
@@ -1198,13 +1201,15 @@ void touch_atime(struct vfsmount *mnt, s
if (mnt &&
((mnt->mnt_flags & MNT_NOATIME) ||
((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))))
- return;
+ goto out;
now = current_fs_time(inode->i_sb);
if (!timespec_equal(&inode->i_atime, &now)) {
inode->i_atime = now;
mark_inode_dirty_sync(inode);
}
+out:
+ mnt_drop_write(mnt);
}
EXPORT_SYMBOL(touch_atime);
diff -puN fs/open.c~ro-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime fs/open.c
--- a/fs/open.c~ro-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime
+++ a/fs/open.c
@@ -384,16 +384,20 @@ asmlinkage long sys_utime(char __user *
goto out;
inode = nd.dentry->d_inode;
+ error = mnt_want_write(nd.mnt);
+ if (error)
+ goto dput_and_out;
+
error = -EROFS;
if (IS_RDONLY(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
/* Don't worry, the checks are done in inode_change_ok() */
newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
if (times) {
error = -EPERM;
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
error = get_user(newattrs.ia_atime.tv_sec, ×->actime);
newattrs.ia_atime.tv_nsec = 0;
@@ -401,21 +405,23 @@ asmlinkage long sys_utime(char __user *
error = get_user(newattrs.ia_mtime.tv_sec, ×->modtime);
newattrs.ia_mtime.tv_nsec = 0;
if (error)
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
} else {
error = -EACCES;
if (IS_IMMUTABLE(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
if (current->fsuid != inode->i_uid &&
(error = vfs_permission(&nd, MAY_WRITE)) != 0)
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
}
mutex_lock(&inode->i_mutex);
error = notify_change(nd.dentry, &newattrs);
mutex_unlock(&inode->i_mutex);
+mnt_drop_write_and_out:
+ mnt_drop_write(nd.mnt);
dput_and_out:
path_release(&nd);
out:
_
Patches currently in -mm which might be from haveblue@xxxxxxxxxx are
origin.patch
catch-notification-of-memory-add-event-of-acpi-via-container-driver-register-start-func-for-memory-device.patch
catch-notification-of-memory-add-event-of-acpi-via-container-driveravoid-redundant-call-add_memory.patch
pgdat-allocation-for-new-node-add-specify-node-id.patch
pgdat-allocation-for-new-node-add-get-node-id-by-acpi.patch
pgdat-allocation-for-new-node-add-generic-alloc-node_data.patch
pgdat-allocation-for-new-node-add-refresh-node_data.patch
pgdat-allocation-for-new-node-add-export-kswapd-start-func.patch
pgdat-allocation-for-new-node-add-call-pgdat-allocation.patch
node-hotplug-register-cpu-remove-node-struct.patch
acpi-dock-driver.patch
ro-bind-mounts-prepare-for-write-access-checks-collapse-if.patch
ro-bind-mounts-r-o-bind-mount-prepwork-move-open_nameis-vfs_create.patch
ro-bind-mounts-add-vfsmount-writer-count.patch
ro-bind-mounts-elevate-mnt-writers-for-callers-of-vfs_mkdir.patch
ro-bind-mounts-elevate-write-count-during-entire-ncp_ioctl.patch
ro-bind-mounts-sys_symlinkat-elevate-write-count-around-vfs_symlink.patch
ro-bind-mounts-elevate-mount-count-for-extended-attributes.patch
ro-bind-mounts-sys_linkat-elevate-write-count-around-vfs_link.patch
ro-bind-mounts-mount_is_safe-add-comment.patch
ro-bind-mounts-unix_find_other-elevate-write-count-for-touch_atime.patch
ro-bind-mounts-elevate-write-count-over-calls-to-vfs_rename.patch
ro-bind-mounts-tricky-elevate-write-count-files-are-opened.patch
ro-bind-mounts-elevate-writer-count-for-do_sys_truncate.patch
ro-bind-mounts-elevate-write-count-for-do_utimes.patch
ro-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime.patch
ro-bind-mounts-sys_mknodat-elevate-write-count-for-vfs_mknod-create.patch
ro-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers.patch
ro-bind-mounts-do_rmdir-elevate-write-count.patch
ro-bind-mounts-elevate-writer-count-for-custom-struct-file.patch
ro-bind-mounts-honor-r-w-changes-at-do_remount-time.patch
page-owner-tracking-leak-detector.patch
x86-e820-debugging.patch
-
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