4.19-stable patches

added patches:
	btrfs-correctly-validate-compression-type.patch

diff --git a/queue-4.19/btrfs-correctly-validate-compression-type.patch b/queue-4.19/btrfs-correctly-validate-compression-type.patch
new file mode 100644 (file)
index 0000000..a87a77d
--- /dev/null
+++ b/queue-4.19/btrfs-correctly-validate-compression-type.patch
@@ -0,0 +1,163 @@
+From aa53e3bfac7205fb3a8815ac1c937fd6ed01b41e Mon Sep 17 00:00:00 2001
+From: Johannes Thumshirn <jthumshirn@suse.de>
+Date: Thu, 6 Jun 2019 12:07:15 +0200
+Subject: btrfs: correctly validate compression type
+
+From: Johannes Thumshirn <jthumshirn@suse.de>
+
+commit aa53e3bfac7205fb3a8815ac1c937fd6ed01b41e upstream.
+
+Nikolay reported the following KASAN splat when running btrfs/048:
+
+[ 1843.470920] ==================================================================
+[ 1843.471971] BUG: KASAN: slab-out-of-bounds in strncmp+0x66/0xb0
+[ 1843.472775] Read of size 1 at addr ffff888111e369e2 by task btrfs/3979
+
+[ 1843.473904] CPU: 3 PID: 3979 Comm: btrfs Not tainted 5.2.0-rc3-default #536
+[ 1843.475009] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
+[ 1843.476322] Call Trace:
+[ 1843.476674]  dump_stack+0x7c/0xbb
+[ 1843.477132]  ? strncmp+0x66/0xb0
+[ 1843.477587]  print_address_description+0x114/0x320
+[ 1843.478256]  ? strncmp+0x66/0xb0
+[ 1843.478740]  ? strncmp+0x66/0xb0
+[ 1843.479185]  __kasan_report+0x14e/0x192
+[ 1843.479759]  ? strncmp+0x66/0xb0
+[ 1843.480209]  kasan_report+0xe/0x20
+[ 1843.480679]  strncmp+0x66/0xb0
+[ 1843.481105]  prop_compression_validate+0x24/0x70
+[ 1843.481798]  btrfs_xattr_handler_set_prop+0x65/0x160
+[ 1843.482509]  __vfs_setxattr+0x71/0x90
+[ 1843.483012]  __vfs_setxattr_noperm+0x84/0x130
+[ 1843.483606]  vfs_setxattr+0xac/0xb0
+[ 1843.484085]  setxattr+0x18c/0x230
+[ 1843.484546]  ? vfs_setxattr+0xb0/0xb0
+[ 1843.485048]  ? __mod_node_page_state+0x1f/0xa0
+[ 1843.485672]  ? _raw_spin_unlock+0x24/0x40
+[ 1843.486233]  ? __handle_mm_fault+0x988/0x1290
+[ 1843.486823]  ? lock_acquire+0xb4/0x1e0
+[ 1843.487330]  ? lock_acquire+0xb4/0x1e0
+[ 1843.487842]  ? mnt_want_write_file+0x3c/0x80
+[ 1843.488442]  ? debug_lockdep_rcu_enabled+0x22/0x40
+[ 1843.489089]  ? rcu_sync_lockdep_assert+0xe/0x70
+[ 1843.489707]  ? __sb_start_write+0x158/0x200
+[ 1843.490278]  ? mnt_want_write_file+0x3c/0x80
+[ 1843.490855]  ? __mnt_want_write+0x98/0xe0
+[ 1843.491397]  __x64_sys_fsetxattr+0xba/0xe0
+[ 1843.492201]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[ 1843.493201]  do_syscall_64+0x6c/0x230
+[ 1843.493988]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 1843.495041] RIP: 0033:0x7fa7a8a7707a
+[ 1843.495819] Code: 48 8b 0d 21 de 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 be 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ee dd 2b 00 f7 d8 64 89 01 48
+[ 1843.499203] RSP: 002b:00007ffcb73bca38 EFLAGS: 00000202 ORIG_RAX: 00000000000000be
+[ 1843.500210] RAX: ffffffffffffffda RBX: 00007ffcb73bda9d RCX: 00007fa7a8a7707a
+[ 1843.501170] RDX: 00007ffcb73bda9d RSI: 00000000006dc050 RDI: 0000000000000003
+[ 1843.502152] RBP: 00000000006dc050 R08: 0000000000000000 R09: 0000000000000000
+[ 1843.503109] R10: 0000000000000002 R11: 0000000000000202 R12: 00007ffcb73bda91
+[ 1843.504055] R13: 0000000000000003 R14: 00007ffcb73bda82 R15: ffffffffffffffff
+
+[ 1843.505268] Allocated by task 3979:
+[ 1843.505771]  save_stack+0x19/0x80
+[ 1843.506211]  __kasan_kmalloc.constprop.5+0xa0/0xd0
+[ 1843.506836]  setxattr+0xeb/0x230
+[ 1843.507264]  __x64_sys_fsetxattr+0xba/0xe0
+[ 1843.507886]  do_syscall_64+0x6c/0x230
+[ 1843.508429]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+
+[ 1843.509558] Freed by task 0:
+[ 1843.510188] (stack is not available)
+
+[ 1843.511309] The buggy address belongs to the object at ffff888111e369e0
+                which belongs to the cache kmalloc-8 of size 8
+[ 1843.514095] The buggy address is located 2 bytes inside of
+                8-byte region [ffff888111e369e0, ffff888111e369e8)
+[ 1843.516524] The buggy address belongs to the page:
+[ 1843.517561] page:ffff88813f478d80 refcount:1 mapcount:0 mapping:ffff88811940c300 index:0xffff888111e373b8 compound_mapcount: 0
+[ 1843.519993] flags: 0x4404000010200(slab|head)
+[ 1843.520951] raw: 0004404000010200 ffff88813f48b008 ffff888119403d50 ffff88811940c300
+[ 1843.522616] raw: ffff888111e373b8 000000000016000f 00000001ffffffff 0000000000000000
+[ 1843.524281] page dumped because: kasan: bad access detected
+
+[ 1843.525936] Memory state around the buggy address:
+[ 1843.526975]  ffff888111e36880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
+[ 1843.528479]  ffff888111e36900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
+[ 1843.530138] >ffff888111e36980: fc fc fc fc fc fc fc fc fc fc fc fc 02 fc fc fc
+[ 1843.531877]                                                        ^
+[ 1843.533287]  ffff888111e36a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
+[ 1843.534874]  ffff888111e36a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
+[ 1843.536468] ==================================================================
+
+This is caused by supplying a too short compression value ('lz') in the
+test-case and comparing it to 'lzo' with strncmp() and a length of 3.
+strncmp() read past the 'lz' when looking for the 'o' and thus caused an
+out-of-bounds read.
+
+Introduce a new check 'btrfs_compress_is_valid_type()' which not only
+checks the user-supplied value against known compression types, but also
+employs checks for too short values.
+
+Reported-by: Nikolay Borisov <nborisov@suse.com>
+Fixes: 272e5326c783 ("btrfs: prop: fix vanished compression property after failed set")
+CC: stable@vger.kernel.org # 5.1+
+Reviewed-by: Nikolay Borisov <nborisov@suse.com>
+Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
+Reviewed-by: David Sterba <dsterba@suse.com>
+Signed-off-by: David Sterba <dsterba@suse.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ fs/btrfs/compression.c |   16 ++++++++++++++++
+ fs/btrfs/compression.h |    1 +
+ fs/btrfs/props.c       |    6 +-----
+ 3 files changed, 18 insertions(+), 5 deletions(-)
+
+--- a/fs/btrfs/compression.c
++++ b/fs/btrfs/compression.c
+@@ -42,6 +42,22 @@ const char* btrfs_compress_type2str(enum
+       return NULL;
+ }
+ 
++bool btrfs_compress_is_valid_type(const char *str, size_t len)
++{
++      int i;
++
++      for (i = 1; i < ARRAY_SIZE(btrfs_compress_types); i++) {
++              size_t comp_len = strlen(btrfs_compress_types[i]);
++
++              if (len < comp_len)
++                      continue;
++
++              if (!strncmp(btrfs_compress_types[i], str, comp_len))
++                      return true;
++      }
++      return false;
++}
++
+ static int btrfs_decompress_bio(struct compressed_bio *cb);
+ 
+ static inline int compressed_bio_size(struct btrfs_fs_info *fs_info,
+--- a/fs/btrfs/compression.h
++++ b/fs/btrfs/compression.h
+@@ -127,6 +127,7 @@ extern const struct btrfs_compress_op bt
+ extern const struct btrfs_compress_op btrfs_zstd_compress;
+ 
+ const char* btrfs_compress_type2str(enum btrfs_compression_type type);
++bool btrfs_compress_is_valid_type(const char *str, size_t len);
+ 
+ int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end);
+ 
+--- a/fs/btrfs/props.c
++++ b/fs/btrfs/props.c
+@@ -366,11 +366,7 @@ int btrfs_subvol_inherit_props(struct bt
+ 
+ static int prop_compression_validate(const char *value, size_t len)
+ {
+-      if (!strncmp("lzo", value, 3))
+-              return 0;
+-      else if (!strncmp("zlib", value, 4))
+-              return 0;
+-      else if (!strncmp("zstd", value, 4))
++      if (btrfs_compression_is_valid_type(value, len))
+               return 0;
+ 
+       return -EINVAL;

diff --git a/queue-4.19/series b/queue-4.19/series
index 027b1d06262eb81d94f1b2bc516b61d4e69a7aad..4506eb49e0b3d593e6473d4c1ee3a1a5d1a0f033 100644 (file)
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -239,3 +239,4 @@ hid-wacom-correct-touch-resolution-x-y-typo.patch
 libnvdimm-pfn-fix-fsdax-mode-namespace-info-block-zero-fields.patch
 coda-pass-the-host-file-in-vma-vm_file-on-mmap.patch
 include-asm-generic-bug.h-fix-cut-here-for-warn_on-for-__warn_taint-architectures.patch
+btrfs-correctly-validate-compression-type.patch