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8880fa32c5
linux/fs
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Kees Cook 8880fa32c5 pstore/ram: Run without kernel crash dump region 
The ram pstore backend has always had the crash dumper frontend enabled
unconditionally. However, it was possible to effectively disable it
by setting a record_size=0. All the machinery would run (storing dumps
to the temporary crash buffer), but 0 bytes would ultimately get stored
due to there being no przs allocated for dumps. Commit 89d328f637
("pstore/ram: Correctly calculate usable PRZ bytes"), however, assumed
that there would always be at least one allocated dprz for calculating
the size of the temporary crash buffer. This was, of course, not the
case when record_size=0, and would lead to a NULL deref trying to find
the dprz buffer size:

BUG: unable to handle kernel NULL pointer dereference at (null)
...
IP: ramoops_probe+0x285/0x37e (fs/pstore/ram.c:808)

        cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size;

Instead, we need to only enable the frontends based on the success of the
prz initialization and only take the needed actions when those zones are
available. (This also fixes a possible error in detecting if the ftrace
frontend should be enabled.)

Reported-and-tested-by: Yaro Slav <yaro330@gmail.com>
Fixes: 89d328f637 ("pstore/ram: Correctly calculate usable PRZ bytes")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
2019-05-31 01:19:06 -07:00
..
9p 9p: switch to ->free_inode() 2019-05-01 22:43:23 -04:00
adfs Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
affs Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
afs afs: Fix application of the results of a inline bulk status fetch 2019-05-16 22:23:21 +01:00
autofs autofs: fix use-after-free in lockless ->d_manage() 2019-04-09 19:18:19 -04:00
befs befs: switch to ->free_inode() 2019-05-01 22:43:23 -04:00
bfs bfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
btrfs for-5.2/block-20190507 2019-05-07 18:14:36 -07:00
cachefiles fs/cachefiles/namei.c: remove duplicate header 2019-05-14 19:52:52 -07:00
ceph On the filesystem side we have: 2019-05-16 16:24:01 -07:00
cifs minor cleanup and fixes, one for stable, also adds SEEK_HOLE support 2019-05-19 11:38:18 -07:00
coda fs/coda/psdev.c: remove duplicate header 2019-05-14 19:52:52 -07:00
configfs configs updates for Linux 5.2: 2019-05-16 11:46:58 -07:00
cramfs
crypto Clean up fscrypt's dcache revalidation support, and other 2019-05-07 21:28:04 -07:00
debugfs Merge branch 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:03:32 -07:00
devpts
dlm genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
ecryptfs Merge branch 'work.icache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 10:57:05 -07:00
efivarfs
efs efs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
exportfs
ext2 \n 2019-05-13 14:59:55 -07:00
ext4 Some bug fixes, and an update to the URL's for the final version of 2019-05-19 11:43:16 -07:00
f2fs f2fs-for-5.2-rc1 2019-05-14 08:55:43 -07:00
fat fs/fat/file.c: issue flush after the writeback of FAT 2019-05-14 19:52:50 -07:00
freevxfs freevxfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
fscache
fuse fuse update for 5.2 2019-05-14 08:59:14 -07:00
gfs2 gfs2: Fix error path kobject memory leak 2019-05-13 15:43:01 -07:00
hfs hfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
hfsplus hfsplus: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
hostfs This pull request contains the following changes for UML: 2019-05-12 17:52:13 -04:00
hpfs hpfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
hugetlbfs hugetlbfs: always use address space in inode for resv_map pointer 2019-05-14 09:47:50 -07:00
isofs isofs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
jbd2 jbd2: fix potential double free 2019-05-10 21:15:47 -04:00
jffs2 Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
jfs Several minor jfs fixes 2019-05-07 11:37:27 -07:00
kernfs Merge branch 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:03:32 -07:00
lockd This pull consists mostly of nfsd container work: 2019-05-15 18:21:43 -07:00
minix minix: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
nfs AFS fixes 2019-05-16 17:00:13 -07:00
nfs_common
nfsd This pull consists mostly of nfsd container work: 2019-05-15 18:21:43 -07:00
nilfs2 nilfs2: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
nls
notify \n 2019-05-13 15:08:16 -07:00
ntfs ntfs: switch to ->free_inode() 2019-05-01 22:43:26 -04:00
ocfs2 treewide: prefix header search paths with $(srctree)/ 2019-05-18 11:49:57 +09:00
omfs
openpromfs openpromfs: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
orangefs mm/gup: change GUP fast to use flags rather than a write 'bool' 2019-05-14 09:47:46 -07:00
overlayfs overlayfs update for 5.2 2019-05-14 09:02:14 -07:00
proc kernel/latencytop.c: rename clear_all_latency_tracing to clear_tsk_latency_tracing 2019-05-14 19:52:49 -07:00
pstore pstore/ram: Run without kernel crash dump region 2019-05-31 01:19:06 -07:00
qnx4 qnx4: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
qnx6 qnx6: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
quota quota: check time limit when back out space/inode change 2019-04-30 18:05:55 +02:00
ramfs
reiserfs reiserfs: add comment to explain endianness issue in xattr_hash 2019-05-14 19:52:50 -07:00
romfs romfs: convert to ->free_inode() 2019-05-01 22:43:25 -04:00
squashfs squashfs: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
sysfs Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-03-16 10:31:02 -07:00
sysv Merge branch 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:03:32 -07:00
tracefs
ubifs ubifs: Convert xattr inum to host order 2019-05-15 21:56:48 +02:00
udf \n 2019-05-13 14:59:55 -07:00
ufs Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
unicode unicode: update to Unicode 12.1.0 final 2019-05-12 13:26:08 -04:00
xfs treewide: prefix header search paths with $(srctree)/ 2019-05-18 11:49:57 +09:00
aio.c aio: use kmem_cache_free() instead of kfree() 2019-04-04 20:13:59 -04:00
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c a.out: remove core dumping support 2019-03-05 10:00:35 -08:00
binfmt_elf_fdpic.c
binfmt_elf.c binfmt_elf: move brk out of mmap when doing direct loader exec 2019-05-14 19:52:50 -07:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c exec: load_script: Do not exec truncated interpreter path 2019-02-18 16:49:36 -08:00
block_dev.c fs/block_dev.c: Remove duplicate header 2019-05-14 19:52:52 -07:00
buffer.c iomap: Fix use-after-free error in page_done callback 2019-05-01 07:47:37 -07:00
char_dev.c chardev: update comment based on the code 2019-04-02 17:49:58 +02:00
compat_binfmt_elf.c
compat_ioctl.c
compat.c
coredump.c
d_path.c
dax.c mm: page_mkclean vs MADV_DONTNEED race 2019-05-14 09:47:48 -07:00
dcache.c Clean up fscrypt's dcache revalidation support, and other 2019-05-07 21:28:04 -07:00
dcookies.c
direct-io.c block: remove the i argument to bio_for_each_segment_all 2019-04-30 09:26:13 -06:00
drop_caches.c
eventfd.c fs/eventfd.c: make eventfd_ida static 2019-05-14 19:52:51 -07:00
eventpoll.c epoll: use rwlock in order to reduce ep_poll_callback() contention 2019-03-07 18:32:01 -08:00
exec.c fs/exec.c: move ->recursion_depth out of critical sections 2019-05-14 19:52:50 -07:00
fcntl.c fs: mark expected switch fall-throughs 2019-04-08 18:21:02 -05:00
fhandle.c
file_table.c vfs: syscall: Add open_tree(2) to reference or clone a mount 2019-03-20 18:49:06 -04:00
file.c io_uring-2019-03-06 2019-03-08 14:48:40 -08:00
filesystems.c vfs: Implement a filesystem superblock creation/configuration context 2019-02-28 03:29:26 -05:00
fs_context.c vfs: syscall: Add fsconfig() for configuring and managing a context 2019-03-20 18:49:06 -04:00
fs_parser.c fs: fs_parser: fix printk format warning 2019-03-29 10:01:38 -07:00
fs_pin.c
fs_struct.c
fs_types.c
fs-writeback.c fs/writeback.c: use rcu_barrier() to wait for inflight wb switches going into workqueue when umount 2019-05-18 15:52:26 -07:00
fsopen.c uapi, fsopen: use square brackets around "fscontext" [ver #2] 2019-05-16 12:23:45 -04:00
inode.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:50:27 -07:00
internal.h Merge branch 'work.mount-syscalls' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:17:51 -07:00
io_uring.c for-linus-20190516 2019-05-16 19:10:37 -07:00
ioctl.c
iomap.c for-5.2/block-20190507 2019-05-07 18:14:36 -07:00
Kconfig unicode: introduce UTF-8 character database 2019-04-25 13:38:44 -04:00
Kconfig.binfmt
libfs.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:50:27 -07:00
locks.c This pull consists mostly of nfsd container work: 2019-05-15 18:21:43 -07:00
Makefile Add as a feature case-insensitive directories (the casefold feature) 2019-05-07 21:12:44 -07:00
mbcache.c
mount.h
mpage.c block: remove the i argument to bio_for_each_segment_all 2019-04-30 09:26:13 -06:00
namei.c Clean up fscrypt's dcache revalidation support, and other 2019-05-07 21:28:04 -07:00
namespace.c do_move_mount(): fix an unsafe use of is_anon_ns() 2019-05-09 02:32:50 -04:00
no-block.c
nsfs.c nsfs: unobfuscate 2019-04-09 19:20:57 -04:00
open.c vfs: pass ppos=NULL to .read()/.write() of FMODE_STREAM files 2019-05-06 17:46:52 +03:00
pipe.c Merge branch 'page-refs' (page ref overflow) 2019-04-14 15:09:40 -07:00
pnode.c
pnode.h
posix_acl.c
proc_namespace.c
read_write.c vfs: pass ppos=NULL to .read()/.write() of FMODE_STREAM files 2019-05-06 17:46:52 +03:00
readdir.c
select.c
seq_file.c fs: mark expected switch fall-throughs 2019-04-08 18:21:02 -05:00
signalfd.c fs: mark expected switch fall-throughs 2019-04-08 18:21:02 -05:00
splice.c There tracing fixes: 2019-04-26 11:09:55 -07:00
stack.c block: remove CONFIG_LBDAF 2019-04-06 10:48:35 -06:00
stat.c
statfs.c
super.c [fix] get rid of checking for absent device name in vfs_get_tree() 2019-04-28 21:34:21 -04:00
sync.c fs/sync.c: sync_file_range(2) may use WB_SYNC_ALL writeback 2019-05-14 09:47:50 -07:00
timerfd.c
userfaultfd.c userfaultfd/sysctl: add vm.unprivileged_userfaultfd 2019-05-14 09:47:45 -07:00
utimes.c
xattr.c