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4407de74df
linux_dsm_epyc7002/fs
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Sebastian Andrzej Siewior 4407de74df pstore/ramoops: fixup driver removal 
A basic rmmod ramoops segfaults. Let's see why.

Since commit 34f0ec82e0 ("pstore: Correct the max_dump_cnt clearing of
ramoops") sets ->max_dump_cnt to zero before looping over ->przs but we
didn't use it before that either.

And since commit ee1d267423 ("pstore: add pstore unregister") we free
that memory on rmmod.

But even then, we looped until a NULL pointer or ERR. I don't see where
it is ensured that the last member is NULL. Let's try this instead:
simply error recovery and free. Clean up in error case where resources
were allocated. And then, in the free path, rely on ->max_dump_cnt in
the free path.

Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org # 4.4.x-
2016-09-08 14:58:00 -07:00
..
9p Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-07 10:01:14 -04:00
adfs Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-07 10:01:14 -04:00
affs get rid of 'parent' argument of ->d_compare() 2016-07-31 16:37:25 -04:00
afs rxrpc: Fix races between skb free, ACK generation and replying 2016-08-06 00:08:40 -04:00
autofs4 Merge branch 'work.const-qstr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-06 09:49:02 -04:00
befs fs/befs/io.c:befs_bread(): remove unneeded initialization to NULL 2016-05-23 17:04:14 -07:00
bfs more trivial ->iterate_shared conversions 2016-05-09 11:41:14 -04:00
btrfs Merge branch 'for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2016-09-03 12:40:45 -07:00
cachefiles cachefiles: Fix race between inactivating and culling a cache object 2016-08-03 13:33:26 -04:00
ceph ceph: initialize pathbase in the !dentry case in encode_caps_cb() 2016-08-09 17:26:56 +02:00
cifs get rid of 'parent' argument of ->d_compare() 2016-07-31 16:37:25 -04:00
coda drop redundant ->owner initializations 2016-05-29 19:08:00 -04:00
configfs configfs: don't set buffer_needs_fill to zero if show() returns error 2016-07-10 21:02:18 +09:00
cramfs more trivial ->iterate_shared conversions 2016-05-09 11:41:14 -04:00
crypto block, fs, mm, drivers: use bio set/get op accessors 2016-06-07 13:41:38 -06:00
debugfs Merge branch 'd_real' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs into work.misc 2016-06-30 23:34:49 -04:00
devpts devpts: return NULL pts 'priv' entry for non-devpts nodes 2016-09-03 11:02:50 -07:00
dlm dlm: fix malfunction of dlm_tool caused by debugfs changes 2016-08-26 13:22:14 -05:00
ecryptfs ecryptfs: don't allow mmap when the lower fs doesn't support it 2016-07-08 10:35:28 -05:00
efivarfs get rid of 'parent' argument of ->d_compare() 2016-07-31 16:37:25 -04:00
efs fs/efs/super.c: fix return value 2016-05-20 17:58:30 -07:00
exofs block, fs, mm, drivers: use bio set/get op accessors 2016-06-07 13:41:38 -06:00
exportfs introduce a parallel variant of ->iterate() 2016-05-02 19:49:29 -04:00
ext2 Merge branch 'work.const-qstr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-06 09:49:02 -04:00
ext4 Fix bugs that could cause kernel deadlocks or file system corruption 2016-08-29 12:37:11 -07:00
f2fs f2fs: avoid potential deadlock in f2fs_move_file_range 2016-08-19 11:15:08 +09:00
fat Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-07 10:01:14 -04:00
freevxfs freevxfs: update Kconfig information 2016-06-13 10:20:39 +02:00
fscache Merge branch 'd_real' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs into work.misc 2016-06-30 23:34:49 -04:00
fuse Merge branch 'work.const-qstr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-06 09:49:02 -04:00
gfs2 fs: return EPERM on immutable inode 2016-08-07 10:03:31 -04:00
hfs Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-07 10:01:14 -04:00
hfsplus Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-07 10:01:14 -04:00
hostfs hostfs: Freeing an ERR_PTR in hostfs_fill_sb_common() 2016-08-04 00:18:10 +02:00
hpfs get rid of 'parent' argument of ->d_compare() 2016-07-31 16:37:25 -04:00
hugetlbfs mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage 2016-04-04 10:41:08 -07:00
isofs get rid of 'parent' argument of ->d_compare() 2016-07-31 16:37:25 -04:00
jbd2 The major change this cycle is deleting ext4's copy of the file system 2016-07-26 18:35:55 -07:00
jffs2 vfs: make the string hashes salt the hash 2016-06-10 20:21:46 -07:00
jfs get rid of 'parent' argument of ->d_compare() 2016-07-31 16:37:25 -04:00
kernfs kernfs: don't depend on d_find_any_alias() when generating notifications 2016-08-31 14:48:52 +02:00
lockd Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-07-28 12:59:05 -07:00
logfs Merge branch 'work.const-qstr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-06 09:49:02 -04:00
minix simple local filesystems: switch to ->iterate_shared() 2016-05-02 19:49:32 -04:00
ncpfs get rid of 'parent' argument of ->d_compare() 2016-07-31 16:37:25 -04:00
nfs NFSv4.x: Fix a refcount leak in nfs_callback_up_net 2016-08-30 09:26:57 -04:00
nfs_common
nfsd nfsd: don't return an unhashed lock stateid after taking mutex 2016-08-12 16:10:25 -04:00
nilfs2 nilfs2: move ioctl interface and disk layout to uapi separately 2016-08-02 19:35:21 -04:00
nls
notify fsnotify: avoid spurious EMFILE errors from inotify_init() 2016-05-19 19:12:14 -07:00
ntfs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-07-28 12:59:05 -07:00
ocfs2 Merge branch 'work.const-qstr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-06 09:49:02 -04:00
omfs more trivial ->iterate_shared conversions 2016-05-09 11:41:14 -04:00
openpromfs more trivial ->iterate_shared conversions 2016-05-09 11:41:14 -04:00
orangefs orangefs: Account for jiffies wraparound. 2016-08-02 15:39:13 -04:00
overlayfs ovl: listxattr: use strnlen() 2016-09-01 11:12:00 +02:00
proc Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit 2016-09-01 15:55:56 -07:00
pstore pstore/ramoops: fixup driver removal 2016-09-08 14:58:00 -07:00
qnx4 more trivial ->iterate_shared conversions 2016-05-09 11:41:14 -04:00
qnx6 more trivial ->iterate_shared conversions 2016-05-09 11:41:14 -04:00
quota Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2016-07-29 15:54:19 -07:00
ramfs tmpfs/ramfs: fix VM_MAYSHARE mappings for NOMMU 2016-05-20 17:58:30 -07:00
reiserfs reiserfs: fix "new_insert_key may be used uninitialized ..." 2016-08-02 19:35:22 -04:00
romfs romfs, squashfs: switch to ->iterate_shared() 2016-05-09 11:41:15 -04:00
squashfs fs: have ll_rw_block users pass in op and flags separately 2016-06-07 13:41:38 -06:00
sysfs sysfs: correctly handle read offset on PREALLOC attrs 2016-08-31 15:14:44 +02:00
sysv vfs: make the string hashes salt the hash 2016-06-10 20:21:46 -07:00
tracefs tracefs: ->d_parent is never NULL or negative... 2016-05-29 16:22:07 -04:00
ubifs ubifs: Fix xattr generic handler usage 2016-08-23 23:02:52 +02:00
udf Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block 2016-07-26 15:37:51 -07:00
ufs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-07-28 12:59:05 -07:00
xfs xfs: track log done items directly in the deferred pending work item 2016-08-30 13:51:39 +10:00
aio.c aio: make aio_setup_ring killable 2016-05-23 17:04:14 -07:00
anon_inodes.c
attr.c vfs: Don't modify inodes with a uid or gid unknown to the vfs 2016-07-05 15:06:46 -05:00
bad_inode.c switch ->setxattr() to passing dentry and inode separately 2016-05-27 20:09:16 -04:00
binfmt_aout.c fs: fix binfmt_aout.c build error 2016-05-28 16:34:59 -07:00
binfmt_elf_fdpic.c elf_fdpic_transfer_args_to_stack(): make it generic 2016-07-25 16:51:49 +10:00
binfmt_elf.c binfmt_elf: switch to new creds when switching to new mm 2016-08-31 09:13:56 -07:00
binfmt_em86.c fs/binfmt_em86.c: fix incompatible pointer type 2016-08-02 19:35:15 -04:00
binfmt_flat.c binfmt_flat: allow compressed flat binary format to work on MMU systems 2016-07-28 13:29:12 +10:00
binfmt_misc.c binfmt_misc for-linus on 20160727 2016-08-07 10:13:14 -04:00
binfmt_script.c
block_dev.c fs/block_dev: fix potential NULL ptr deref in freeze_bdev() 2016-08-25 08:38:26 -06:00
buffer.c xfs: update for 4.8-rc1 2016-07-27 09:53:35 -07:00
char_dev.c chardev: add missing line break in pr_warn 2016-07-14 16:21:53 +09:00
compat_binfmt_elf.c
compat_ioctl.c [media] cec: add compat32 ioctl support 2016-06-28 10:00:13 -03:00
compat.c Fix a number of bugs, most notably a potential stale data exposure 2016-05-24 12:55:26 -07:00
coredump.c coredump: fix dumping through pipes 2016-06-07 22:07:09 -04:00
dax.c libnvdimm for 4.8 2016-07-28 17:38:16 -07:00
dcache.c Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-07 10:01:14 -04:00
dcookies.c
direct-io.c direct-io: use bio set/get op accessors 2016-06-07 13:41:38 -06:00
drop_caches.c
eventfd.c eventfd: document lockless access in eventfd_poll 2016-03-22 15:36:02 -07:00
eventpoll.c fs: poll/select/recvmmsg: use timespec64 for timeout events 2016-05-19 19:12:14 -07:00
exec.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2016-08-04 18:04:44 -04:00
fcntl.c fcntl: allow to set O_DIRECT flag on pipe 2016-01-09 02:55:37 -05:00
fhandle.c fs/coredump: prevent fsuid=0 dumps into user-controlled directories 2016-03-22 15:36:02 -07:00
file_table.c
file.c give readdir(2)/getdents(2)/etc. uniform exclusion with lseek() 2016-05-02 19:49:28 -04:00
filesystems.c find_filesystem(): simplify comparison 2016-01-19 12:02:23 -05:00
fs_pin.c
fs_struct.c
fs-writeback.c mm, writeback: flush plugged IO in wakeup_flusher_threads() 2016-08-09 19:58:06 -06:00
inode.c Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-08-07 10:01:14 -04:00
internal.h binfmt_misc for-linus on 20160727 2016-08-07 10:13:14 -04:00
ioctl.c vfs: ioctl: prevent double-fetch in dedupe ioctl 2016-07-28 15:23:12 -07:00
iomap.c iomap: don't set FIEMAP_EXTENT_MERGED for extent based filesystems 2016-08-29 11:33:58 +10:00
Kconfig Highlights: 2016-08-04 19:59:06 -04:00
Kconfig.binfmt m68k: enable binfmt_flat on systems with an MMU 2016-07-28 13:29:13 +10:00
libfs.c lockless next_positive() 2016-06-20 17:11:29 -04:00
locks.c locks: use file_inode() 2016-07-01 10:24:18 -04:00
Makefile fs: introduce iomap infrastructure 2016-06-21 09:23:11 +10:00
mbcache.c mbcache: add reusable flag to cache entries 2016-02-22 22:44:04 -05:00
mount.h
mpage.c block/mm: make bdev_ops->rw_page() take a bool for read/write 2016-08-07 14:41:02 -06:00
namei.c fs: return EPERM on immutable inode 2016-08-07 10:03:31 -04:00
namespace.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2016-07-29 15:54:19 -07:00
no-block.c
nsfs.c
open.c binfmt_misc for-linus on 20160727 2016-08-07 10:13:14 -04:00
pipe.c mm: memcontrol: only mark charged pages with PageKmemcg 2016-08-09 10:14:10 -07:00
pnode.c propogate_mnt: Handle the first propogated copy being a slave 2016-05-05 09:54:45 -05:00
pnode.h
posix_acl.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2016-07-29 15:54:19 -07:00
proc_namespace.c vfs: show_vfsstat: do not ignore errors from show_devname method 2016-03-16 13:09:08 -04:00
read_write.c x86/syscalls: Add compat_sys_preadv64v2/compat_sys_pwritev64v2 2016-07-15 10:30:26 +02:00
readdir.c restore killability of old mutex_lock_killable(&inode->i_mutex) users 2016-05-26 00:13:25 -04:00
select.c fs: poll/select/recvmmsg: use timespec64 for timeout events 2016-05-19 19:12:14 -07:00
seq_file.c fs/seq_file: fix out-of-bounds read 2016-08-26 17:39:35 -07:00
signalfd.c
splice.c Merge branch 'ovl-fixes' into for-linus 2016-05-11 00:00:29 -04:00
stack.c
stat.c fs/stat.c: drop the last new_valid_dev check 2016-01-16 11:17:23 -08:00
statfs.c
super.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2016-07-29 15:54:19 -07:00
sync.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
timerfd.c timerfd: Reject ALARM timerfds without CAP_WAKE_ALARM 2016-06-09 23:42:38 +02:00
userfaultfd.c mm: introduce fault_env 2016-07-26 16:19:19 -07:00
utimes.c fs: return EPERM on immutable inode 2016-08-07 10:03:31 -04:00
xattr.c vfs: Don't modify inodes with a uid or gid unknown to the vfs 2016-07-05 15:06:46 -05:00