From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Jianhong Yin <jiyin@redhat.com>,
Stefano Brivio <sbrivio@redhat.com>,
Steve French <stfrench@microsoft.com>
Subject: [PATCH 4.14 12/53] cifs: Fix slab-out-of-bounds in send_set_info() on SMB2 ACE setting
Date: Tue, 10 Jul 2018 20:24:48 +0200 [thread overview]
Message-ID: <20180710182459.628491182@linuxfoundation.org> (raw)
In-Reply-To: <20180710182458.736721865@linuxfoundation.org>
4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefano Brivio <sbrivio@redhat.com>
commit f46ecbd97f508e68a7806291a139499794874f3d upstream.
A "small" CIFS buffer is not big enough in general to hold a
setacl request for SMB2, and we end up overflowing the buffer in
send_set_info(). For instance:
# mount.cifs //127.0.0.1/test /mnt/test -o username=test,password=test,nounix,cifsacl
# touch /mnt/test/acltest
# getcifsacl /mnt/test/acltest
REVISION:0x1
CONTROL:0x9004
OWNER:S-1-5-21-2926364953-924364008-418108241-1000
GROUP:S-1-22-2-1001
ACL:S-1-5-21-2926364953-924364008-418108241-1000:ALLOWED/0x0/0x1e01ff
ACL:S-1-22-2-1001:ALLOWED/0x0/R
ACL:S-1-22-2-1001:ALLOWED/0x0/R
ACL:S-1-5-21-2926364953-924364008-418108241-1000:ALLOWED/0x0/0x1e01ff
ACL:S-1-1-0:ALLOWED/0x0/R
# setcifsacl -a "ACL:S-1-22-2-1004:ALLOWED/0x0/R" /mnt/test/acltest
this setacl will cause the following KASAN splat:
[ 330.777927] BUG: KASAN: slab-out-of-bounds in send_set_info+0x4dd/0xc20 [cifs]
[ 330.779696] Write of size 696 at addr ffff88010d5e2860 by task setcifsacl/1012
[ 330.781882] CPU: 1 PID: 1012 Comm: setcifsacl Not tainted 4.18.0-rc2+ #2
[ 330.783140] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 330.784395] Call Trace:
[ 330.784789] dump_stack+0xc2/0x16b
[ 330.786777] print_address_description+0x6a/0x270
[ 330.787520] kasan_report+0x258/0x380
[ 330.788845] memcpy+0x34/0x50
[ 330.789369] send_set_info+0x4dd/0xc20 [cifs]
[ 330.799511] SMB2_set_acl+0x76/0xa0 [cifs]
[ 330.801395] set_smb2_acl+0x7ac/0xf30 [cifs]
[ 330.830888] cifs_xattr_set+0x963/0xe40 [cifs]
[ 330.840367] __vfs_setxattr+0x84/0xb0
[ 330.842060] __vfs_setxattr_noperm+0xe6/0x370
[ 330.843848] vfs_setxattr+0xc2/0xd0
[ 330.845519] setxattr+0x258/0x320
[ 330.859211] path_setxattr+0x15b/0x1b0
[ 330.864392] __x64_sys_setxattr+0xc0/0x160
[ 330.866133] do_syscall_64+0x14e/0x4b0
[ 330.876631] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 330.878503] RIP: 0033:0x7ff2e507db0a
[ 330.880151] Code: 48 8b 0d 89 93 2c 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 bc 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 56 93 2c 00 f7 d8 64 89 01 48
[ 330.885358] RSP: 002b:00007ffdc4903c18 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
[ 330.887733] RAX: ffffffffffffffda RBX: 000055d1170de140 RCX: 00007ff2e507db0a
[ 330.890067] RDX: 000055d1170de7d0 RSI: 000055d115b39184 RDI: 00007ffdc4904818
[ 330.892410] RBP: 0000000000000001 R08: 0000000000000000 R09: 000055d1170de7e4
[ 330.894785] R10: 00000000000002b8 R11: 0000000000000246 R12: 0000000000000007
[ 330.897148] R13: 000055d1170de0c0 R14: 0000000000000008 R15: 000055d1170de550
[ 330.901057] Allocated by task 1012:
[ 330.902888] kasan_kmalloc+0xa0/0xd0
[ 330.904714] kmem_cache_alloc+0xc8/0x1d0
[ 330.906615] mempool_alloc+0x11e/0x380
[ 330.908496] cifs_small_buf_get+0x35/0x60 [cifs]
[ 330.910510] smb2_plain_req_init+0x4a/0xd60 [cifs]
[ 330.912551] send_set_info+0x198/0xc20 [cifs]
[ 330.914535] SMB2_set_acl+0x76/0xa0 [cifs]
[ 330.916465] set_smb2_acl+0x7ac/0xf30 [cifs]
[ 330.918453] cifs_xattr_set+0x963/0xe40 [cifs]
[ 330.920426] __vfs_setxattr+0x84/0xb0
[ 330.922284] __vfs_setxattr_noperm+0xe6/0x370
[ 330.924213] vfs_setxattr+0xc2/0xd0
[ 330.926008] setxattr+0x258/0x320
[ 330.927762] path_setxattr+0x15b/0x1b0
[ 330.929592] __x64_sys_setxattr+0xc0/0x160
[ 330.931459] do_syscall_64+0x14e/0x4b0
[ 330.933314] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 330.936843] Freed by task 0:
[ 330.938588] (stack is not available)
[ 330.941886] The buggy address belongs to the object at ffff88010d5e2800
which belongs to the cache cifs_small_rq of size 448
[ 330.946362] The buggy address is located 96 bytes inside of
448-byte region [ffff88010d5e2800, ffff88010d5e29c0)
[ 330.950722] The buggy address belongs to the page:
[ 330.952789] page:ffffea0004357880 count:1 mapcount:0 mapping:ffff880108fdca80 index:0x0 compound_mapcount: 0
[ 330.955665] flags: 0x17ffffc0008100(slab|head)
[ 330.957760] raw: 0017ffffc0008100 dead000000000100 dead000000000200 ffff880108fdca80
[ 330.960356] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[ 330.963005] page dumped because: kasan: bad access detected
[ 330.967039] Memory state around the buggy address:
[ 330.969255] ffff88010d5e2880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 330.971833] ffff88010d5e2900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 330.974397] >ffff88010d5e2980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
[ 330.976956] ^
[ 330.979226] ffff88010d5e2a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 330.981755] ffff88010d5e2a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 330.984225] ==================================================================
Fix this by allocating a regular CIFS buffer in
smb2_plain_req_init() if the request command is SMB2_SET_INFO.
Reported-by: Jianhong Yin <jiyin@redhat.com>
Fixes: 366ed846df60 ("cifs: Use smb 2 - 3 and cifsacl mount options setacl function")
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-and-tested-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/cifs/smb2pdu.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -338,7 +338,10 @@ smb2_plain_req_init(__le16 smb2_command,
return rc;
/* BB eventually switch this to SMB2 specific small buf size */
- *request_buf = cifs_small_buf_get();
+ if (smb2_command == SMB2_SET_INFO)
+ *request_buf = cifs_buf_get();
+ else
+ *request_buf = cifs_small_buf_get();
if (*request_buf == NULL) {
/* BB should we add a retry in here if not a writepage? */
return -ENOMEM;
@@ -3168,7 +3171,7 @@ send_set_info(const unsigned int xid, st
}
rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
- cifs_small_buf_release(req);
+ cifs_buf_release(req);
rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
if (rc != 0)
next prev parent reply other threads:[~2018-07-10 18:32 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-10 18:24 [PATCH 4.14 00/53] 4.14.55-stable review Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 01/53] userfaultfd: hugetlbfs: fix userfaultfd_huge_must_wait() pte access Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 02/53] mm: hugetlb: yield when prepping struct pages Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 03/53] tracing: Fix missing return symbol in function_graph output Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 04/53] scsi: sg: mitigate read/write abuse Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 05/53] scsi: target: Fix truncated PR-in ReadKeys response Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 06/53] s390: Correct register corruption in critical section cleanup Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 07/53] drbd: fix access after free Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 08/53] vfio: Use get_user_pages_longterm correctly Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 09/53] cifs: Fix use after free of a mid_q_entry Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 10/53] cifs: Fix memory leak in smb2_set_ea() Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 11/53] cifs: Fix infinite loop when using hard mount option Greg Kroah-Hartman
2018-07-10 18:24 ` Greg Kroah-Hartman [this message]
2018-07-10 18:24 ` [PATCH 4.14 13/53] drm: Use kvzalloc for allocating blob property memory Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 14/53] drm/udl: fix display corruption of the last line Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 15/53] jbd2: dont mark block as modified if the handle is out of credits Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 16/53] ext4: add corruption check in ext4_xattr_set_entry() Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 17/53] ext4: always verify the magic number in xattr blocks Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 18/53] ext4: make sure bitmaps and the inode table dont overlap with bg descriptors Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 19/53] ext4: always check block group bounds in ext4_init_block_bitmap() Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 20/53] ext4: only look at the bg_flags field if it is valid Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 21/53] ext4: verify the depth of extent tree in ext4_find_extent() Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 22/53] ext4: include the illegal physical block in the bad map ext4_error msg Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 4.14 23/53] ext4: clear i_data in ext4_inode_info when removing inline data Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 24/53] ext4: never move the system.data xattr out of the inode body Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 25/53] ext4: avoid running out of journal credits when appending to an inline file Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 26/53] ext4: add more inode number paranoia checks Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 27/53] ext4: add more mount time checks of the superblock Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 28/53] ext4: check superblock mapped prior to committing Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 29/53] block: factor out __blkdev_issue_zero_pages() Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 30/53] block: cope with WRITE ZEROES failing in blkdev_issue_zeroout() Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 31/53] HID: i2c-hid: Fix "incomplete report" noise Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 32/53] HID: hiddev: fix potential Spectre v1 Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 33/53] HID: debug: check length before copy_to_user() Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 34/53] irq/core: Fix boot crash when the irqaffinity= boot parameter is passed on CPUMASK_OFFSTACK=y kernels(v1) Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 35/53] mm: hwpoison: disable memory error handling on 1GB hugepage Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 36/53] media: vb2: core: Finish buffers at the end of the stream Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 37/53] f2fs: truncate preallocated blocks in error case Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 38/53] [PATCH] Revert "dpaa_eth: fix error in dpaa_remove()" Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 39/53] Kbuild: fix # escaping in .cmd files for future Make Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 40/53] media: cx25840: Use subdev host data for PLL override Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 41/53] mtd: rawnand: mxc: set spare area size register explicitly Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 42/53] fs: allow per-device dax status checking for filesystems Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 43/53] dax: change bdev_dax_supported() to support boolean returns Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 44/53] dax: check for QUEUE_FLAG_DAX in bdev_dax_supported() Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 45/53] dm: set QUEUE_FLAG_DAX accordingly in dm_table_set_restrictions() Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 46/53] dm: prevent DAX mounts if not supported Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 47/53] mtd: cfi_cmdset_0002: Change definition naming to retry write operation Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 48/53] mtd: cfi_cmdset_0002: Change erase functions to retry for error Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 49/53] mtd: cfi_cmdset_0002: Change erase functions to check chip good only Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 50/53] netfilter: nf_log: dont hold nf_log_mutex during user access Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 51/53] staging: comedi: quatech_daqp_cs: fix no-op loop daqp_ao_insn_write() Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 52/53] sched, tracing: Fix trace_sched_pi_setprio() for deboosting Greg Kroah-Hartman
2018-07-10 18:25 ` [PATCH 4.14 53/53] Revert mm/vmstat.c: fix vmstat_update() preemption BUG Greg Kroah-Hartman
2018-07-11 13:05 ` [PATCH 4.14 00/53] 4.14.55-stable review Naresh Kamboju
2018-07-11 13:41 ` Guenter Roeck
2018-07-11 15:20 ` Shuah Khan
-- strict thread matches above, loose matches on Subject: below --
2018-07-25 16:06 [PATCH 4.14 12/53] cifs: Fix slab-out-of-bounds in send_set_info() on SMB2 ACE setting Philip Müller
2018-07-25 22:12 ` Stefano Brivio
2018-07-26 10:22 ` Greg Kroah-Hartman
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