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Ben Hutchings d8bfd2f23b nfsd: auth: Fix gid sorting when rootsquash enabled 
commit 1995266727fa8143897e89b55f5d3c79aa828420 upstream.

Commit bdcf0a423ea1 ("kernel: make groups_sort calling a responsibility
group_info allocators") appears to break nfsd rootsquash in a pretty
major way.

It adds a call to groups_sort() inside the loop that copies/squashes
gids, which means the valid gids are sorted along with the following
garbage.  The net result is that the highest numbered valid gids are
replaced with any lower-valued garbage gids, possibly including 0.

We should sort only once, after filling in all the gids.

Fixes: bdcf0a423ea1 ("kernel: make groups_sort calling a responsibility ...")
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
2019-07-27 21:46:18 +02:00
..
9p Merge tag 'LA.BR.1.3.6-03910-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2017-05-26 13:28:48 +02:00
adfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
affs This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
afs
autofs4 move d_rcu from overlapping d_child to overlapping d_alias 2015-04-29 10:34:00 +02:00
befs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
bfs
btrfs Merge tag 'LA.BR.1.3.6-03910-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2017-05-26 13:28:48 +02:00
cachefiles
ceph move d_rcu from overlapping d_child to overlapping d_alias 2015-04-29 10:34:00 +02:00
cifs This is the 3.10.102 stable release 2017-04-18 17:22:08 +02:00
coda This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
configfs configfs: fix race between dentry put and lookup 2013-11-29 11:11:53 -08:00
cramfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
crypto fscrypt: catch up to v4.11-rc1 2017-03-09 11:48:12 -08:00
debugfs BACKPORT: dentry name snapshots 2017-12-22 20:25:56 +00:00
devpts This is the 3.10.98 stable release 2017-04-18 17:17:24 +02:00
dlm
ecryptfs fs: ecryptfs: Checkout to LA.BR.1.3.6-04510-8976.0 2018-02-06 13:12:17 +01:00
efivarfs efi: Make efivarfs entries immutable by default 2016-03-16 08:41:37 -07:00
efs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
exfat Import latest Samsung release 2017-04-18 03:43:52 +02:00
exofs ore: Fix wrong math in allocation of per device BIO 2014-02-13 13:48:00 -08:00
exportfs This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
ext2 it's still short a few helpers, but infrastructure should be OK now... 2018-12-03 11:52:03 +01:00
ext3 posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
ext4 ext4: fix crash when a directory's i_size is too small 2019-07-27 21:46:17 +02:00
f2fs UPSTREAM: f2fs: sanity check segment count 2017-09-08 18:49:20 +00:00
fat fat: fix using uninitialized fields of fat_inode/fsinfo_inode 2019-07-27 21:43:58 +02:00
freevxfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
fscache FS-Cache: fix dereference of NULL user_key_payload 2019-07-27 21:44:20 +02:00
fuse fuse: initialize the flock flag in fuse_file on allocation 2019-07-27 21:44:16 +02:00
gfs2 posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
hfs Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
hfsplus Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
hostfs uml: fix hostfs mknod() 2016-03-03 15:06:23 -08:00
hpfs Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
hppfs
hugetlbfs mm: larger stack guard gap, between vmas 2017-07-11 00:00:39 +00:00
isofs isofs: fix timestamps beyond 2027 2019-07-27 21:46:04 +02:00
jbd
jbd2 This is the 3.10.102 stable release 2017-04-18 17:22:08 +02:00
jffs2 Merge tag 'LA.BR.1.3.6-03910-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2017-05-26 13:28:48 +02:00
jfs posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
lockd lockd: create NSM handles per net namespace 2016-03-03 15:06:20 -08:00
logfs
minix it's still short a few helpers, but infrastructure should be OK now... 2018-12-03 11:52:03 +01:00
ncpfs This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
nfs This is the 3.10.99 stable release 2017-04-18 17:17:46 +02:00
nfs_common
nfsd nfsd: auth: Fix gid sorting when rootsquash enabled 2019-07-27 21:46:18 +02:00
nilfs2 This is the 3.10.84 stable release 2015-09-30 13:25:40 +05:30
nls
notify vfs: Add permission2 for filesystems with per mount permissions 2018-02-06 13:12:19 +01:00
ntfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
ocfs2 posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
omfs fs, omfs: add NULL terminator in the end up the token list 2015-06-05 23:19:54 -07:00
openpromfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
proc UPSTREAM: capabilities: ambient capabilities 2018-02-06 13:12:16 +01:00
pstore pstore/ram: Use memcpy_fromio() to save old buffer 2019-07-27 21:42:50 +02:00
qnx4 fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
qnx6 fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
quota quota: provide interface for readding allocated space into reserved space 2015-01-29 17:40:57 -08:00
ramfs
reiserfs posix_acl: Clear SGID bit when setting file permissions 2017-04-28 00:00:11 -07:00
romfs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
sdcardfs ANDROID: sdcardfs: Protect set_top 2018-08-15 14:40:15 +02:00
sdfat Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
squashfs Squashfs: Add LZ4 compression configuration option 2015-09-16 18:20:12 +05:30
sysfs Import latest Samsung release 2017-04-18 03:43:52 +02:00
sysv This is the 3.10.97 stable release 2017-04-18 17:17:20 +02:00
ubifs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
udf This is the 3.10.98 stable release 2017-04-18 17:17:24 +02:00
ufs fs: push sync_filesystem() down to the file system's remount_fs() 2015-09-16 18:20:11 +05:30
xfs posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
yaffs2 fs: yaffs2: initialize delayed workqueue before using it 2013-11-26 23:29:26 -08:00
aio.c Merge tag 'LA.BR.1.3.6-03510-8976.0' into HEAD 2017-04-18 12:11:50 +02:00
anon_inodes.c
attr.c vfs: Add setattr2 for filesystems with per mount permissions 2018-02-06 13:12:20 +01:00
bad_inode.c
binfmt_aout.c mm: remove free_area_cache 2014-02-07 13:49:41 -08:00
binfmt_elf.c This is the 3.10.97 stable release 2017-04-18 17:17:20 +02:00
binfmt_elf_fdpic.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c bio-integrity: Fix bio_integrity_verify segment start bug 2014-03-23 21:38:21 -07:00
bio.c more bio_map_user_iov() leak fixes 2019-07-27 21:45:37 +02:00
block_dev.c block: protect iterate_bdevs() against concurrent close 2019-07-27 21:42:54 +02:00
buffer.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
char_dev.c
compat.c constify ->actor 2015-09-16 18:20:09 +05:30
compat_binfmt_elf.c binfmt_elf: add ELF_HWCAP2 to compat auxv entries 2015-03-19 14:52:32 -07:00
compat_ioctl.c fs: Add TTY PM IOCTLs to compat table 2014-07-30 10:25:00 -06:00
coredump.c coredump: fix unfreezable coredumping task 2019-07-27 21:42:15 +02:00
coredump.h
dcache.c fs: take_dentry_name_snapshot: avoid kfree under spinlock fixup 2019-07-27 21:45:27 +02:00
dcookies.c fs/compat: fix lookup_dcookie() parameter handling 2014-02-13 13:48:00 -08:00
direct-io.c direct-io: Prevent NULL pointer access in submit_page_section 2019-07-27 21:44:19 +02:00
drop_caches.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
eventfd.c
eventpoll.c epoll: fix race between ep_poll_callback(POLLFREE) and ep_free()/ep_remove() 2019-07-27 21:45:14 +02:00
exec.c fs: exec: apply CLOEXEC before changing dumpable task flags 2019-07-27 21:43:25 +02:00
fcntl.c vfs: add missing check for __O_TMPFILE in fcntl_init() 2018-12-03 11:52:41 +01:00
fhandle.c vfs: read file_handle only once in handle_to_path. 2015-07-22 07:25:30 -07:00
file.c Merge upstream linux-stable v3.10.36 into msm-3.10 2014-04-23 16:23:49 -07:00
file_table.c get rid of s_files and files_lock 2015-07-03 19:48:08 -07:00
filesystems.c
fs-writeback.c sync: don't block the flusher thread waiting on IO 2015-09-16 18:20:20 +05:30
fs_struct.c sdcardfs: override umask on mkdir and create 2018-02-06 13:12:18 +01:00
generic_acl.c tmpfs: clear S_ISGID when setting posix ACLs 2017-04-22 23:02:57 +02:00
inode.c allow the temp files created by open() to be linked to 2018-12-03 11:52:08 +01:00
internal.h vfs: Allow filesystems to access their private mount data 2018-02-06 13:12:19 +01:00
ioctl.c
ioprio.c block: fix use-after-free in sys_ioprio_get() 2016-11-19 20:01:20 -08:00
Kconfig Initial port of sdcardfs 2018-02-06 13:12:17 +01:00
Kconfig.binfmt
libfs.c move d_rcu from overlapping d_child to overlapping d_alias 2015-04-29 10:34:00 +02:00
locks.c locks: fix unlock when fcntl_setlk races with a close 2016-03-09 15:31:53 -08:00
Makefile Initial port of sdcardfs 2018-02-06 13:12:17 +01:00
mbcache.c
mount.h vfs: Is mounted should be testing mnt_ns for NULL or error. 2014-02-06 11:08:16 -08:00
mpage.c
namei.c VFS: Properly free dentry name snapshots in vfs_rename2 2019-07-27 21:46:08 +02:00
namespace.c vfs: Allow filesystems to access their private mount data 2018-02-06 13:12:19 +01:00
no-block.c
open.c fs: Fix file mode for O_TMPFILE 2018-12-03 11:52:40 +01:00
pipe.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
pnode.c ANDROID: mnt: remount should propagate to slaves of slaves 2018-02-06 13:12:20 +01:00
pnode.h ANDROID: mnt: remount should propagate to slaves of slaves 2018-02-06 13:12:20 +01:00
posix_acl.c posix_acl: Clear SGID bit when setting file permissions 2019-07-27 21:42:52 +02:00
proc_namespace.c vfs: Allow filesystems to access their private mount data 2018-02-06 13:12:19 +01:00
read_write.c fs: Workaround the compiler's bad optimization 2016-02-04 13:23:34 +05:30
readdir.c fs: readdir: Fix su hide patch for non-iterate filesystems 2017-07-14 21:04:43 +02:00
select.c select: use freezable blocking call 2013-07-01 15:45:28 -07:00
seq_file.c fs/seq_file: fix out-of-bounds read 2019-07-27 21:42:21 +02:00
signalfd.c signalfd: fix information leak in signalfd_copyinfo 2015-08-16 20:51:42 -07:00
splice.c vfs: fix uninitialized flags in splice_to_pipe() 2019-07-27 21:43:53 +02:00
stack.c
stat.c quota: provide interface for readding allocated space into reserved space 2015-01-29 17:40:57 -08:00
statfs.c vfs: allow O_PATH file descriptors for fstatfs() 2013-10-18 07:45:44 -07:00
super.c vfs: Allow filesystems to access their private mount data 2018-02-06 13:12:19 +01:00
sync.c Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
timerfd.c timerfd: Protect the might cancel mechanism proper 2017-11-08 05:33:07 -08:00
utimes.c vfs: Add setattr2 for filesystems with per mount permissions 2018-02-06 13:12:20 +01:00
xattr.c ANDROID: xattr: Pass EOPNOTSUPP to permission2 2018-08-15 14:40:12 +02:00
xattr_acl.c