| CVE |
Vendors |
Products |
Updated |
CVSS v3.1 |
| In the Linux kernel, the following vulnerability has been resolved:
firewire: core: fix race condition against transaction list
The list of transaction is enumerated without acquiring card lock when
processing AR response event. This causes a race condition bug when
processing AT request completion event concurrently.
This commit fixes the bug by put timer start for split transaction
expiration into the scope of lock. The value of jiffies in card structure
is referred before acquiring the lock. |
| In the Linux kernel, the following vulnerability has been resolved:
btrfs: do not strictly require dirty metadata threshold for metadata writepages
[BUG]
There is an internal report that over 1000 processes are
waiting at the io_schedule_timeout() of balance_dirty_pages(), causing
a system hang and trigger a kernel coredump.
The kernel is v6.4 kernel based, but the root problem still applies to
any upstream kernel before v6.18.
[CAUSE]
From Jan Kara for his wisdom on the dirty page balance behavior first.
This cgroup dirty limit was what was actually playing the role here
because the cgroup had only a small amount of memory and so the dirty
limit for it was something like 16MB.
Dirty throttling is responsible for enforcing that nobody can dirty
(significantly) more dirty memory than there's dirty limit. Thus when
a task is dirtying pages it periodically enters into balance_dirty_pages()
and we let it sleep there to slow down the dirtying.
When the system is over dirty limit already (either globally or within
a cgroup of the running task), we will not let the task exit from
balance_dirty_pages() until the number of dirty pages drops below the
limit.
So in this particular case, as I already mentioned, there was a cgroup
with relatively small amount of memory and as a result with dirty limit
set at 16MB. A task from that cgroup has dirtied about 28MB worth of
pages in btrfs btree inode and these were practically the only dirty
pages in that cgroup.
So that means the only way to reduce the dirty pages of that cgroup is
to writeback the dirty pages of btrfs btree inode, and only after that
those processes can exit balance_dirty_pages().
Now back to the btrfs part, btree_writepages() is responsible for
writing back dirty btree inode pages.
The problem here is, there is a btrfs internal threshold that if the
btree inode's dirty bytes are below the 32M threshold, it will not
do any writeback.
This behavior is to batch as much metadata as possible so we won't write
back those tree blocks and then later re-COW them again for another
modification.
This internal 32MiB is higher than the existing dirty page size (28MiB),
meaning no writeback will happen, causing a deadlock between btrfs and
cgroup:
- Btrfs doesn't want to write back btree inode until more dirty pages
- Cgroup/MM doesn't want more dirty pages for btrfs btree inode
Thus any process touching that btree inode is put into sleep until
the number of dirty pages is reduced.
Thanks Jan Kara a lot for the analysis of the root cause.
[ENHANCEMENT]
Since kernel commit b55102826d7d ("btrfs: set AS_KERNEL_FILE on the
btree_inode"), btrfs btree inode pages will only be charged to the root
cgroup which should have a much larger limit than btrfs' 32MiB
threshold.
So it should not affect newer kernels.
But for all current LTS kernels, they are all affected by this problem,
and backporting the whole AS_KERNEL_FILE may not be a good idea.
Even for newer kernels I still think it's a good idea to get
rid of the internal threshold at btree_writepages(), since for most cases
cgroup/MM has a better view of full system memory usage than btrfs' fixed
threshold.
For internal callers using btrfs_btree_balance_dirty() since that
function is already doing internal threshold check, we don't need to
bother them.
But for external callers of btree_writepages(), just respect their
requests and write back whatever they want, ignoring the internal
btrfs threshold to avoid such deadlock on btree inode dirty page
balancing. |
| In the Linux kernel, the following vulnerability has been resolved:
arm64: Set __nocfi on swsusp_arch_resume()
A DABT is reported[1] on an android based system when resume from hiberate.
This happens because swsusp_arch_suspend_exit() is marked with SYM_CODE_*()
and does not have a CFI hash, but swsusp_arch_resume() will attempt to
verify the CFI hash when calling a copy of swsusp_arch_suspend_exit().
Given that there's an existing requirement that the entrypoint to
swsusp_arch_suspend_exit() is the first byte of the .hibernate_exit.text
section, we cannot fix this by marking swsusp_arch_suspend_exit() with
SYM_FUNC_*(). The simplest fix for now is to disable the CFI check in
swsusp_arch_resume().
Mark swsusp_arch_resume() as __nocfi to disable the CFI check.
[1]
[ 22.991934][ T1] Unable to handle kernel paging request at virtual address 0000000109170ffc
[ 22.991934][ T1] Mem abort info:
[ 22.991934][ T1] ESR = 0x0000000096000007
[ 22.991934][ T1] EC = 0x25: DABT (current EL), IL = 32 bits
[ 22.991934][ T1] SET = 0, FnV = 0
[ 22.991934][ T1] EA = 0, S1PTW = 0
[ 22.991934][ T1] FSC = 0x07: level 3 translation fault
[ 22.991934][ T1] Data abort info:
[ 22.991934][ T1] ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000
[ 22.991934][ T1] CM = 0, WnR = 0, TnD = 0, TagAccess = 0
[ 22.991934][ T1] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[ 22.991934][ T1] [0000000109170ffc] user address but active_mm is swapper
[ 22.991934][ T1] Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP
[ 22.991934][ T1] Dumping ftrace buffer:
[ 22.991934][ T1] (ftrace buffer empty)
[ 22.991934][ T1] Modules linked in:
[ 22.991934][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.98-android15-8-g0b1d2aee7fc3-dirty-4k #1 688c7060a825a3ac418fe53881730b355915a419
[ 22.991934][ T1] Hardware name: Unisoc UMS9360-base Board (DT)
[ 22.991934][ T1] pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 22.991934][ T1] pc : swsusp_arch_resume+0x2ac/0x344
[ 22.991934][ T1] lr : swsusp_arch_resume+0x294/0x344
[ 22.991934][ T1] sp : ffffffc08006b960
[ 22.991934][ T1] x29: ffffffc08006b9c0 x28: 0000000000000000 x27: 0000000000000000
[ 22.991934][ T1] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000820
[ 22.991934][ T1] x23: ffffffd0817e3000 x22: ffffffd0817e3000 x21: 0000000000000000
[ 22.991934][ T1] x20: ffffff8089171000 x19: ffffffd08252c8c8 x18: ffffffc080061058
[ 22.991934][ T1] x17: 00000000529c6ef0 x16: 00000000529c6ef0 x15: 0000000000000004
[ 22.991934][ T1] x14: ffffff8178c88000 x13: 0000000000000006 x12: 0000000000000000
[ 22.991934][ T1] x11: 0000000000000015 x10: 0000000000000001 x9 : ffffffd082533000
[ 22.991934][ T1] x8 : 0000000109171000 x7 : 205b5d3433393139 x6 : 392e32322020205b
[ 22.991934][ T1] x5 : 000000010916f000 x4 : 000000008164b000 x3 : ffffff808a4e0530
[ 22.991934][ T1] x2 : ffffffd08058e784 x1 : 0000000082326000 x0 : 000000010a283000
[ 22.991934][ T1] Call trace:
[ 22.991934][ T1] swsusp_arch_resume+0x2ac/0x344
[ 22.991934][ T1] hibernation_restore+0x158/0x18c
[ 22.991934][ T1] load_image_and_restore+0xb0/0xec
[ 22.991934][ T1] software_resume+0xf4/0x19c
[ 22.991934][ T1] software_resume_initcall+0x34/0x78
[ 22.991934][ T1] do_one_initcall+0xe8/0x370
[ 22.991934][ T1] do_initcall_level+0xc8/0x19c
[ 22.991934][ T1] do_initcalls+0x70/0xc0
[ 22.991934][ T1] do_basic_setup+0x1c/0x28
[ 22.991934][ T1] kernel_init_freeable+0xe0/0x148
[ 22.991934][ T1] kernel_init+0x20/0x1a8
[ 22.991934][ T1] ret_from_fork+0x10/0x20
[ 22.991934][ T1] Code: a9400a61 f94013e0 f9438923 f9400a64 (b85fc110)
[catalin.marinas@arm.com: commit log updated by Mark Rutland] |
| In the Linux kernel, the following vulnerability has been resolved:
rxrpc: Fix data-race warning and potential load/store tearing
Fix the following:
BUG: KCSAN: data-race in rxrpc_peer_keepalive_worker / rxrpc_send_data_packet
which is reporting an issue with the reads and writes to ->last_tx_at in:
conn->peer->last_tx_at = ktime_get_seconds();
and:
keepalive_at = peer->last_tx_at + RXRPC_KEEPALIVE_TIME;
The lockless accesses to these to values aren't actually a problem as the
read only needs an approximate time of last transmission for the purposes
of deciding whether or not the transmission of a keepalive packet is
warranted yet.
Also, as ->last_tx_at is a 64-bit value, tearing can occur on a 32-bit
arch.
Fix both of these by switching to an unsigned int for ->last_tx_at and only
storing the LSW of the time64_t. It can then be reconstructed at need
provided no more than 68 years has elapsed since the last transmission. |
| In the Linux kernel, the following vulnerability has been resolved:
nfc: llcp: Fix memleak in nfc_llcp_send_ui_frame().
syzbot reported various memory leaks related to NFC, struct
nfc_llcp_sock, sk_buff, nfc_dev, etc. [0]
The leading log hinted that nfc_llcp_send_ui_frame() failed
to allocate skb due to sock_error(sk) being -ENXIO.
ENXIO is set by nfc_llcp_socket_release() when struct
nfc_llcp_local is destroyed by local_cleanup().
The problem is that there is no synchronisation between
nfc_llcp_send_ui_frame() and local_cleanup(), and skb
could be put into local->tx_queue after it was purged in
local_cleanup():
CPU1 CPU2
---- ----
nfc_llcp_send_ui_frame() local_cleanup()
|- do { '
|- pdu = nfc_alloc_send_skb(..., &err)
| .
| |- nfc_llcp_socket_release(local, false, ENXIO);
| |- skb_queue_purge(&local->tx_queue); |
| ' |
|- skb_queue_tail(&local->tx_queue, pdu); |
... |
|- pdu = nfc_alloc_send_skb(..., &err) |
^._________________________________.'
local_cleanup() is called for struct nfc_llcp_local only
after nfc_llcp_remove_local() unlinks it from llcp_devices.
If we hold local->tx_queue.lock then, we can synchronise
the thread and nfc_llcp_send_ui_frame().
Let's do that and check list_empty(&local->list) before
queuing skb to local->tx_queue in nfc_llcp_send_ui_frame().
[0]:
[ 56.074943][ T6096] llcp: nfc_llcp_send_ui_frame: Could not allocate PDU (error=-6)
[ 64.318868][ T5813] kmemleak: 6 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
BUG: memory leak
unreferenced object 0xffff8881272f6800 (size 1024):
comm "syz.0.17", pid 6096, jiffies 4294942766
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
27 00 03 40 00 00 00 00 00 00 00 00 00 00 00 00 '..@............
backtrace (crc da58d84d):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4979 [inline]
slab_alloc_node mm/slub.c:5284 [inline]
__do_kmalloc_node mm/slub.c:5645 [inline]
__kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5658
kmalloc_noprof include/linux/slab.h:961 [inline]
sk_prot_alloc+0x11a/0x1b0 net/core/sock.c:2239
sk_alloc+0x36/0x360 net/core/sock.c:2295
nfc_llcp_sock_alloc+0x37/0x130 net/nfc/llcp_sock.c:979
llcp_sock_create+0x71/0xd0 net/nfc/llcp_sock.c:1044
nfc_sock_create+0xc9/0xf0 net/nfc/af_nfc.c:31
__sock_create+0x1a9/0x340 net/socket.c:1605
sock_create net/socket.c:1663 [inline]
__sys_socket_create net/socket.c:1700 [inline]
__sys_socket+0xb9/0x1a0 net/socket.c:1747
__do_sys_socket net/socket.c:1761 [inline]
__se_sys_socket net/socket.c:1759 [inline]
__x64_sys_socket+0x1b/0x30 net/socket.c:1759
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
BUG: memory leak
unreferenced object 0xffff88810fbd9800 (size 240):
comm "syz.0.17", pid 6096, jiffies 4294942850
hex dump (first 32 bytes):
68 f0 ff 08 81 88 ff ff 68 f0 ff 08 81 88 ff ff h.......h.......
00 00 00 00 00 00 00 00 00 68 2f 27 81 88 ff ff .........h/'....
backtrace (crc 6cc652b1):
kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
slab_post_alloc_hook mm/slub.c:4979 [inline]
slab_alloc_node mm/slub.c:5284 [inline]
kmem_cache_alloc_node_noprof+0x36f/0x5e0 mm/slub.c:5336
__alloc_skb+0x203/0x240 net/core/skbuff.c:660
alloc_skb include/linux/skbuff.h:1383 [inline]
alloc_skb_with_frags+0x69/0x3f0 net/core/sk
---truncated--- |
| In the Linux kernel, the following vulnerability has been resolved:
drm/imx/tve: fix probe device leak
Make sure to drop the reference taken to the DDC device during probe on
probe failure (e.g. probe deferral) and on driver unbind. |
| In the Linux kernel, the following vulnerability has been resolved:
bonding: fix use-after-free due to enslave fail after slave array update
Fix a use-after-free which happens due to enslave failure after the new
slave has been added to the array. Since the new slave can be used for Tx
immediately, we can use it after it has been freed by the enslave error
cleanup path which frees the allocated slave memory. Slave update array is
supposed to be called last when further enslave failures are not expected.
Move it after xdp setup to avoid any problems.
It is very easy to reproduce the problem with a simple xdp_pass prog:
ip l add bond1 type bond mode balance-xor
ip l set bond1 up
ip l set dev bond1 xdp object xdp_pass.o sec xdp_pass
ip l add dumdum type dummy
Then run in parallel:
while :; do ip l set dumdum master bond1 1>/dev/null 2>&1; done;
mausezahn bond1 -a own -b rand -A rand -B 1.1.1.1 -c 0 -t tcp "dp=1-1023, flags=syn"
The crash happens almost immediately:
[ 605.602850] Oops: general protection fault, probably for non-canonical address 0xe0e6fc2460000137: 0000 [#1] SMP KASAN NOPTI
[ 605.602916] KASAN: maybe wild-memory-access in range [0x07380123000009b8-0x07380123000009bf]
[ 605.602946] CPU: 0 UID: 0 PID: 2445 Comm: mausezahn Kdump: loaded Tainted: G B 6.19.0-rc6+ #21 PREEMPT(voluntary)
[ 605.602979] Tainted: [B]=BAD_PAGE
[ 605.602998] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 605.603032] RIP: 0010:netdev_core_pick_tx+0xcd/0x210
[ 605.603063] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 3e 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6b 08 49 8d 7d 30 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 25 01 00 00 49 8b 45 30 4c 89 e2 48 89 ee 48 89
[ 605.603111] RSP: 0018:ffff88817b9af348 EFLAGS: 00010213
[ 605.603145] RAX: dffffc0000000000 RBX: ffff88817d28b420 RCX: 0000000000000000
[ 605.603172] RDX: 00e7002460000137 RSI: 0000000000000008 RDI: 07380123000009be
[ 605.603199] RBP: ffff88817b541a00 R08: 0000000000000001 R09: fffffbfff3ed8c0c
[ 605.603226] R10: ffffffff9f6c6067 R11: 0000000000000001 R12: 0000000000000000
[ 605.603253] R13: 073801230000098e R14: ffff88817d28b448 R15: ffff88817b541a84
[ 605.603286] FS: 00007f6570ef67c0(0000) GS:ffff888221dfa000(0000) knlGS:0000000000000000
[ 605.603319] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 605.603343] CR2: 00007f65712fae40 CR3: 000000011371b000 CR4: 0000000000350ef0
[ 605.603373] Call Trace:
[ 605.603392] <TASK>
[ 605.603410] __dev_queue_xmit+0x448/0x32a0
[ 605.603434] ? __pfx_vprintk_emit+0x10/0x10
[ 605.603461] ? __pfx_vprintk_emit+0x10/0x10
[ 605.603484] ? __pfx___dev_queue_xmit+0x10/0x10
[ 605.603507] ? bond_start_xmit+0xbfb/0xc20 [bonding]
[ 605.603546] ? _printk+0xcb/0x100
[ 605.603566] ? __pfx__printk+0x10/0x10
[ 605.603589] ? bond_start_xmit+0xbfb/0xc20 [bonding]
[ 605.603627] ? add_taint+0x5e/0x70
[ 605.603648] ? add_taint+0x2a/0x70
[ 605.603670] ? end_report.cold+0x51/0x75
[ 605.603693] ? bond_start_xmit+0xbfb/0xc20 [bonding]
[ 605.603731] bond_start_xmit+0x623/0xc20 [bonding] |
| In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: TC, delete flows only for existing peers
When deleting TC steering flows, iterate only over actual devcom
peers instead of assuming all possible ports exist. This avoids
touching non-existent peers and ensures cleanup is limited to
devices the driver is currently connected to.
BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 133c8a067 P4D 0
Oops: Oops: 0002 [#1] SMP
CPU: 19 UID: 0 PID: 2169 Comm: tc Not tainted 6.18.0+ #156 NONE
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
RIP: 0010:mlx5e_tc_del_fdb_peers_flow+0xbe/0x200 [mlx5_core]
Code: 00 00 a8 08 74 a8 49 8b 46 18 f6 c4 02 74 9f 4c 8d bf a0 12 00 00 4c 89 ff e8 0e e7 96 e1 49 8b 44 24 08 49 8b 0c 24 4c 89 ff <48> 89 41 08 48 89 08 49 89 2c 24 49 89 5c 24 08 e8 7d ce 96 e1 49
RSP: 0018:ff11000143867528 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dead000000000122 RCX: 0000000000000000
RDX: ff11000143691580 RSI: ff110001026e5000 RDI: ff11000106f3d2a0
RBP: dead000000000100 R08: 00000000000003fd R09: 0000000000000002
R10: ff11000101c75690 R11: ff1100085faea178 R12: ff11000115f0ae78
R13: 0000000000000000 R14: ff11000115f0a800 R15: ff11000106f3d2a0
FS: 00007f35236bf740(0000) GS:ff110008dc809000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000157a01001 CR4: 0000000000373eb0
Call Trace:
<TASK>
mlx5e_tc_del_flow+0x46/0x270 [mlx5_core]
mlx5e_flow_put+0x25/0x50 [mlx5_core]
mlx5e_delete_flower+0x2a6/0x3e0 [mlx5_core]
tc_setup_cb_reoffload+0x20/0x80
fl_reoffload+0x26f/0x2f0 [cls_flower]
? mlx5e_tc_reoffload_flows_work+0xc0/0xc0 [mlx5_core]
? mlx5e_tc_reoffload_flows_work+0xc0/0xc0 [mlx5_core]
tcf_block_playback_offloads+0x9e/0x1c0
tcf_block_unbind+0x7b/0xd0
tcf_block_setup+0x186/0x1d0
tcf_block_offload_cmd.isra.0+0xef/0x130
tcf_block_offload_unbind+0x43/0x70
__tcf_block_put+0x85/0x160
ingress_destroy+0x32/0x110 [sch_ingress]
__qdisc_destroy+0x44/0x100
qdisc_graft+0x22b/0x610
tc_get_qdisc+0x183/0x4d0
rtnetlink_rcv_msg+0x2d7/0x3d0
? rtnl_calcit.isra.0+0x100/0x100
netlink_rcv_skb+0x53/0x100
netlink_unicast+0x249/0x320
? __alloc_skb+0x102/0x1f0
netlink_sendmsg+0x1e3/0x420
__sock_sendmsg+0x38/0x60
____sys_sendmsg+0x1ef/0x230
? copy_msghdr_from_user+0x6c/0xa0
___sys_sendmsg+0x7f/0xc0
? ___sys_recvmsg+0x8a/0xc0
? __sys_sendto+0x119/0x180
__sys_sendmsg+0x61/0xb0
do_syscall_64+0x55/0x640
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7f35238bb764
Code: 15 b9 86 0c 00 f7 d8 64 89 02 b8 ff ff ff ff eb bf 0f 1f 44 00 00 f3 0f 1e fa 80 3d e5 08 0d 00 00 74 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 4c c3 0f 1f 00 55 48 89 e5 48 83 ec 20 89 55
RSP: 002b:00007ffed4c35638 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000055a2efcc75e0 RCX: 00007f35238bb764
RDX: 0000000000000000 RSI: 00007ffed4c356a0 RDI: 0000000000000003
RBP: 00007ffed4c35710 R08: 0000000000000010 R09: 00007f3523984b20
R10: 0000000000000004 R11: 0000000000000202 R12: 00007ffed4c35790
R13: 000000006947df8f R14: 000055a2efcc75e0 R15: 00007ffed4c35780 |
| In the Linux kernel, the following vulnerability has been resolved:
wifi: ath10k: fix dma_free_coherent() pointer
dma_alloc_coherent() allocates a DMA mapped buffer and stores the
addresses in XXX_unaligned fields. Those should be reused when freeing
the buffer rather than the aligned addresses. |
| In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix early read unlock of page with EOF in middle
The read result collection for buffered reads seems to run ahead of the
completion of subrequests under some circumstances, as can be seen in the
following log snippet:
9p_client_res: client 18446612686390831168 response P9_TREAD tag 0 err 0
...
netfs_sreq: R=00001b55[1] DOWN TERM f=192 s=0 5fb2/5fb2 s=5 e=0
...
netfs_collect_folio: R=00001b55 ix=00004 r=4000-5000 t=4000/5fb2
netfs_folio: i=157f3 ix=00004-00004 read-done
netfs_folio: i=157f3 ix=00004-00004 read-unlock
netfs_collect_folio: R=00001b55 ix=00005 r=5000-5fb2 t=5000/5fb2
netfs_folio: i=157f3 ix=00005-00005 read-done
netfs_folio: i=157f3 ix=00005-00005 read-unlock
...
netfs_collect_stream: R=00001b55[0:] cto=5fb2 frn=ffffffff
netfs_collect_state: R=00001b55 col=5fb2 cln=6000 n=c
netfs_collect_stream: R=00001b55[0:] cto=5fb2 frn=ffffffff
netfs_collect_state: R=00001b55 col=5fb2 cln=6000 n=8
...
netfs_sreq: R=00001b55[2] ZERO SUBMT f=000 s=5fb2 0/4e s=0 e=0
netfs_sreq: R=00001b55[2] ZERO TERM f=102 s=5fb2 4e/4e s=5 e=0
The 'cto=5fb2' indicates the collected file pos we've collected results to
so far - but we still have 0x4e more bytes to go - so we shouldn't have
collected folio ix=00005 yet. The 'ZERO' subreq that clears the tail
happens after we unlock the folio, allowing the application to see the
uncleared tail through mmap.
The problem is that netfs_read_unlock_folios() will unlock a folio in which
the amount of read results collected hits EOF position - but the ZERO
subreq lies beyond that and so happens after.
Fix this by changing the end check to always be the end of the folio and
never the end of the file.
In the future, I should look at clearing to the end of the folio here rather
than adding a ZERO subreq to do this. On the other hand, the ZERO subreq can
run in parallel with an async READ subreq. Further, the ZERO subreq may still
be necessary to, say, handle extents in a ceph file that don't have any
backing store and are thus implicitly all zeros.
This can be reproduced by creating a file, the size of which doesn't align
to a page boundary, e.g. 24998 (0x5fb2) bytes and then doing something
like:
xfs_io -c "mmap -r 0 0x6000" -c "madvise -d 0 0x6000" \
-c "mread -v 0 0x6000" /xfstest.test/x
The last 0x4e bytes should all be 00, but if the tail hasn't been cleared
yet, you may see rubbish there. This can be reproduced with kafs by
modifying the kernel to disable the call to netfs_read_subreq_progress()
and to stop afs_issue_read() from doing the async call for NETFS_READAHEAD.
Reproduction can be made easier by inserting an mdelay(100) in
netfs_issue_read() for the ZERO-subreq case.
AFS and CIFS are normally unlikely to show this as they dispatch READ ops
asynchronously, which allows the ZERO-subreq to finish first. 9P's READ op is
completely synchronous, so the ZERO-subreq will always happen after. It isn't
seen all the time, though, because the collection may be done in a worker
thread. |
| In the Linux kernel, the following vulnerability has been resolved:
mISDN: annotate data-race around dev->work
dev->work can re read locklessly in mISDN_read()
and mISDN_poll(). Add READ_ONCE()/WRITE_ONCE() annotations.
BUG: KCSAN: data-race in mISDN_ioctl / mISDN_read
write to 0xffff88812d848280 of 4 bytes by task 10864 on cpu 1:
misdn_add_timer drivers/isdn/mISDN/timerdev.c:175 [inline]
mISDN_ioctl+0x2fb/0x550 drivers/isdn/mISDN/timerdev.c:233
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xce/0x140 fs/ioctl.c:583
__x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583
x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
read to 0xffff88812d848280 of 4 bytes by task 10857 on cpu 0:
mISDN_read+0x1f2/0x470 drivers/isdn/mISDN/timerdev.c:112
do_loop_readv_writev fs/read_write.c:847 [inline]
vfs_readv+0x3fb/0x690 fs/read_write.c:1020
do_readv+0xe7/0x210 fs/read_write.c:1080
__do_sys_readv fs/read_write.c:1165 [inline]
__se_sys_readv fs/read_write.c:1162 [inline]
__x64_sys_readv+0x45/0x50 fs/read_write.c:1162
x64_sys_call+0x2831/0x3000 arch/x86/include/generated/asm/syscalls_64.h:20
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
value changed: 0x00000000 -> 0x00000001 |
| In the Linux kernel, the following vulnerability has been resolved:
netdevsim: fix a race issue related to the operation on bpf_bound_progs list
The netdevsim driver lacks a protection mechanism for operations on the
bpf_bound_progs list. When the nsim_bpf_create_prog() performs
list_add_tail, it is possible that nsim_bpf_destroy_prog() is
simultaneously performs list_del. Concurrent operations on the list may
lead to list corruption and trigger a kernel crash as follows:
[ 417.290971] kernel BUG at lib/list_debug.c:62!
[ 417.290983] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[ 417.290992] CPU: 10 PID: 168 Comm: kworker/10:1 Kdump: loaded Not tainted 6.19.0-rc5 #1
[ 417.291003] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 417.291007] Workqueue: events bpf_prog_free_deferred
[ 417.291021] RIP: 0010:__list_del_entry_valid_or_report+0xa7/0xc0
[ 417.291034] Code: a8 ff 0f 0b 48 89 fe 48 89 ca 48 c7 c7 48 a1 eb ae e8 ed fb a8 ff 0f 0b 48 89 fe 48 89 c2 48 c7 c7 80 a1 eb ae e8 d9 fb a8 ff <0f> 0b 48 89 d1 48 c7 c7 d0 a1 eb ae 48 89 f2 48 89 c6 e8 c2 fb a8
[ 417.291040] RSP: 0018:ffffb16a40807df8 EFLAGS: 00010246
[ 417.291046] RAX: 000000000000006d RBX: ffff8e589866f500 RCX: 0000000000000000
[ 417.291051] RDX: 0000000000000000 RSI: ffff8e59f7b23180 RDI: ffff8e59f7b23180
[ 417.291055] RBP: ffffb16a412c9000 R08: 0000000000000000 R09: 0000000000000003
[ 417.291059] R10: ffffb16a40807c80 R11: ffffffffaf9edce8 R12: ffff8e594427ac20
[ 417.291063] R13: ffff8e59f7b44780 R14: ffff8e58800b7a05 R15: 0000000000000000
[ 417.291074] FS: 0000000000000000(0000) GS:ffff8e59f7b00000(0000) knlGS:0000000000000000
[ 417.291079] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 417.291083] CR2: 00007fc4083efe08 CR3: 00000001c3626006 CR4: 0000000000770ee0
[ 417.291088] PKRU: 55555554
[ 417.291091] Call Trace:
[ 417.291096] <TASK>
[ 417.291103] nsim_bpf_destroy_prog+0x31/0x80 [netdevsim]
[ 417.291154] __bpf_prog_offload_destroy+0x2a/0x80
[ 417.291163] bpf_prog_dev_bound_destroy+0x6f/0xb0
[ 417.291171] bpf_prog_free_deferred+0x18e/0x1a0
[ 417.291178] process_one_work+0x18a/0x3a0
[ 417.291188] worker_thread+0x27b/0x3a0
[ 417.291197] ? __pfx_worker_thread+0x10/0x10
[ 417.291207] kthread+0xe5/0x120
[ 417.291214] ? __pfx_kthread+0x10/0x10
[ 417.291221] ret_from_fork+0x31/0x50
[ 417.291230] ? __pfx_kthread+0x10/0x10
[ 417.291236] ret_from_fork_asm+0x1a/0x30
[ 417.291246] </TASK>
Add a mutex lock, to prevent simultaneous addition and deletion operations
on the list. |
| In the Linux kernel, the following vulnerability has been resolved:
btrfs: zlib: fix the folio leak on S390 hardware acceleration
[BUG]
After commit aa60fe12b4f4 ("btrfs: zlib: refactor S390x HW acceleration
buffer preparation"), we no longer release the folio of the page cache
of folio returned by btrfs_compress_filemap_get_folio() for S390
hardware acceleration path.
[CAUSE]
Before that commit, we call kumap_local() and folio_put() after handling
each folio.
Although the timing is not ideal (it release previous folio at the
beginning of the loop, and rely on some extra cleanup out of the loop),
it at least handles the folio release correctly.
Meanwhile the refactored code is easier to read, it lacks the call to
release the filemap folio.
[FIX]
Add the missing folio_put() for copy_data_into_buffer(). |
| In the Linux kernel, the following vulnerability has been resolved:
drm: Do not allow userspace to trigger kernel warnings in drm_gem_change_handle_ioctl()
Since GEM bo handles are u32 in the uapi and the internal implementation
uses idr_alloc() which uses int ranges, passing a new handle larger than
INT_MAX trivially triggers a kernel warning:
idr_alloc():
...
if (WARN_ON_ONCE(start < 0))
return -EINVAL;
...
Fix it by rejecting new handles above INT_MAX and at the same time make
the end limit calculation more obvious by moving into int domain. |
| In the Linux kernel, the following vulnerability has been resolved:
efivarfs: fix error propagation in efivar_entry_get()
efivar_entry_get() always returns success even if the underlying
__efivar_entry_get() fails, masking errors.
This may result in uninitialized heap memory being copied to userspace
in the efivarfs_file_read() path.
Fix it by returning the error from __efivar_entry_get(). |
| The User Language Switch plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 1.6.10 due to missing URL validation on the 'download_language()' function. This makes it possible for authenticated attackers, with Administrator-level access and above, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services. |
| The ZoomifyWP Free plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'filename' parameter of the 'zoomify' shortcode in all versions up to, and including, 1.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. |
| The WP Quick Contact Us plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0. This is due to missing nonce validation on the settings update functionality. This makes it possible for unauthenticated attackers to update the plugin's settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. |
| The Super Page Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Activity Log in all versions up to, and including, 5.2.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. |
| The PixelYourSite PRO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'pysTrafficSource' parameter and the 'pys_landing_page' parameter in all versions up to, and including, 12.4.0.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. |
