[as posted on Feb 4, with accumulated acked-by/reviewed-by added; the original
branch is also tagged (pull-fixes.pathwalk-rcu), the only difference is in the
added lines in commit messages and resulting update of commit dates]
The following changes since commit 6613476e225e090cc9aad49be7fa504e290dd33d:
Linux 6.8-rc1 (2024-01-21 14:11:32 -0800)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git tags/pull-fixes.pathwalk-rcu-2
for you to fetch changes up to 9fa8e282c2bfe93338e81a620a49f5903a745231:
ext4_get_link(): fix breakage in RCU mode (2024-02-25 02:10:32 -0500)
----------------------------------------------------------------
We still have some races in filesystem methods when exposed to RCU
pathwalk. This series is a result of code audit (the second round
of it) and it should deal with most of that stuff. Exceptions: ntfs3
->d_hash()/->d_compare() and ceph_d_revalidate(). Up to maintainers (a
note for NTFS folks - when documentation says that a method may not block,
it *does* imply that blocking allocations are to be avoided. Really).
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
----------------------------------------------------------------
Al Viro (13):
fs/super.c: don't drop ->s_user_ns until we free struct super_block itself
rcu pathwalk: prevent bogus hard errors from may_lookup()
affs: free affs_sb_info with kfree_rcu()
exfat: move freeing sbi, upcase table and dropping nls into rcu-delayed helper
hfsplus: switch to rcu-delayed unloading of nls and freeing ->s_fs_info
afs: fix __afs_break_callback() / afs_drop_open_mmap() race
nfs: make nfs_set_verifier() safe for use in RCU pathwalk
nfs: fix UAF on pathwalk running into umount
procfs: move dropping pde and pid from ->evict_inode() to ->free_inode()
procfs: make freeing proc_fs_info rcu-delayed
fuse: fix UAF in rcu pathwalks
cifs_get_link(): bail out in unsafe case
ext4_get_link(): fix breakage in RCU mode
fs/affs/affs.h | 1 +
fs/affs/super.c | 2 +-
fs/afs/file.c | 8 ++++++--
fs/exfat/exfat_fs.h | 1 +
fs/exfat/nls.c | 14 ++++----------
fs/exfat/super.c | 20 +++++++++++---------
fs/ext4/symlink.c | 8 +++++---
fs/fuse/cuse.c | 3 +--
fs/fuse/fuse_i.h | 1 +
fs/fuse/inode.c | 15 +++++++++++----
fs/hfsplus/hfsplus_fs.h | 1 +
fs/hfsplus/super.c | 12 +++++++++---
fs/namei.c | 6 +++++-
fs/nfs/client.c | 13 ++++++++++---
fs/nfs/dir.c | 4 ++--
fs/proc/base.c | 2 --
fs/proc/inode.c | 19 ++++++++-----------
fs/proc/root.c | 2 +-
fs/smb/client/cifsfs.c | 3 +++
fs/super.c | 13 ++++---------
include/linux/nfs_fs_sb.h | 2 ++
include/linux/proc_fs.h | 1 +
22 files changed, 88 insertions(+), 63 deletions(-)
