Security Vulnerabilities - CVEs Published In February 2024
In the Linux kernel, the following vulnerability has been resolved:
mt76: mt7921: fix memory leak in mt7921_coredump_work
Fix possible memory leak in mt7921_coredump_work.
CVSS Score
4.3
EPSS Score
0.001
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
mt76: mt7915: fix tx skb dma unmap
The first pointer in the txp needs to be unmapped as well, otherwise it will
leak DMA mapping entries
CVSS Score
5.5
EPSS Score
0.0
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
mt76: mt7615: fix tx skb dma unmap
The first pointer in the txp needs to be unmapped as well, otherwise it will
leak DMA mapping entries
CVSS Score
5.5
EPSS Score
0.0
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
powerpc/64s: Fix pte update for kernel memory on radix
When adding a PTE a ptesync is needed to order the update of the PTE
with subsequent accesses otherwise a spurious fault may be raised.
radix__set_pte_at() does not do this for performance gains. For
non-kernel memory this is not an issue as any faults of this kind are
corrected by the page fault handler. For kernel memory these faults
are not handled. The current solution is that there is a ptesync in
flush_cache_vmap() which should be called when mapping from the
vmalloc region.
However, map_kernel_page() does not call flush_cache_vmap(). This is
troublesome in particular for code patching with Strict RWX on radix.
In do_patch_instruction() the page frame that contains the instruction
to be patched is mapped and then immediately patched. With no ordering
or synchronization between setting up the PTE and writing to the page
it is possible for faults.
As the code patching is done using __put_user_asm_goto() the resulting
fault is obscured - but using a normal store instead it can be seen:
BUG: Unable to handle kernel data access on write at 0xc008000008f24a3c
Faulting instruction address: 0xc00000000008bd74
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV
Modules linked in: nop_module(PO+) [last unloaded: nop_module]
CPU: 4 PID: 757 Comm: sh Tainted: P O 5.10.0-rc5-01361-ge3c1b78c8440-dirty #43
NIP: c00000000008bd74 LR: c00000000008bd50 CTR: c000000000025810
REGS: c000000016f634a0 TRAP: 0300 Tainted: P O (5.10.0-rc5-01361-ge3c1b78c8440-dirty)
MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 44002884 XER: 00000000
CFAR: c00000000007c68c DAR: c008000008f24a3c DSISR: 42000000 IRQMASK: 1
This results in the kind of issue reported here:
https://lore.kernel.org/linuxppc-dev/15AC5B0E-A221-4B8C-9039-FA96B8EF7C88@lca.pw/
Chris Riedl suggested a reliable way to reproduce the issue:
$ mount -t debugfs none /sys/kernel/debug
$ (while true; do echo function > /sys/kernel/debug/tracing/current_tracer ; echo nop > /sys/kernel/debug/tracing/current_tracer ; done) &
Turning ftrace on and off does a large amount of code patching which
in usually less then 5min will crash giving a trace like:
ftrace-powerpc: (____ptrval____): replaced (4b473b11) != old (60000000)
------------[ ftrace bug ]------------
ftrace failed to modify
[<c000000000bf8e5c>] napi_busy_loop+0xc/0x390
actual: 11:3b:47:4b
Setting ftrace call site to call ftrace function
ftrace record flags: 80000001
(1)
expected tramp: c00000000006c96c
------------[ cut here ]------------
WARNING: CPU: 4 PID: 809 at kernel/trace/ftrace.c:2065 ftrace_bug+0x28c/0x2e8
Modules linked in: nop_module(PO-) [last unloaded: nop_module]
CPU: 4 PID: 809 Comm: sh Tainted: P O 5.10.0-rc5-01360-gf878ccaf250a #1
NIP: c00000000024f334 LR: c00000000024f330 CTR: c0000000001a5af0
REGS: c000000004c8b760 TRAP: 0700 Tainted: P O (5.10.0-rc5-01360-gf878ccaf250a)
MSR: 900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 28008848 XER: 20040000
CFAR: c0000000001a9c98 IRQMASK: 0
GPR00: c00000000024f330 c000000004c8b9f0 c000000002770600 0000000000000022
GPR04: 00000000ffff7fff c000000004c8b6d0 0000000000000027 c0000007fe9bcdd8
GPR08: 0000000000000023 ffffffffffffffd8 0000000000000027 c000000002613118
GPR12: 0000000000008000 c0000007fffdca00 0000000000000000 0000000000000000
GPR16: 0000000023ec37c5 0000000000000000 0000000000000000 0000000000000008
GPR20: c000000004c8bc90 c0000000027a2d20 c000000004c8bcd0 c000000002612fe8
GPR24: 0000000000000038 0000000000000030 0000000000000028 0000000000000020
GPR28: c000000000ff1b68 c000000000bf8e5c c00000000312f700 c000000000fbb9b0
NIP ftrace_bug+0x28c/0x2e8
LR ftrace_bug+0x288/0x2e8
Call T
---truncated---
CVSS Score
4.4
EPSS Score
0.0
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Remove WO permissions on second-level paging entries
When the first level page table is used for IOVA translation, it only
supports Read-Only and Read-Write permissions. The Write-Only permission
is not supported as the PRESENT bit (implying Read permission) should
always set. When using second level, we still give separate permissions
that allows WriteOnly which seems inconsistent and awkward. We want to
have consistent behavior. After moving to 1st level, we don't want things
to work sometimes, and break if we use 2nd level for the same mappings.
Hence remove this configuration.
CVSS Score
5.5
EPSS Score
0.001
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
udp: skip L4 aggregation for UDP tunnel packets
If NETIF_F_GRO_FRAGLIST or NETIF_F_GRO_UDP_FWD are enabled, and there
are UDP tunnels available in the system, udp_gro_receive() could end-up
doing L4 aggregation (either SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST) at
the outer UDP tunnel level for packets effectively carrying and UDP
tunnel header.
That could cause inner protocol corruption. If e.g. the relevant
packets carry a vxlan header, different vxlan ids will be ignored/
aggregated to the same GSO packet. Inner headers will be ignored, too,
so that e.g. TCP over vxlan push packets will be held in the GRO
engine till the next flush, etc.
Just skip the SKB_GSO_UDP_L4 and SKB_GSO_FRAGLIST code path if the
current packet could land in a UDP tunnel, and let udp_gro_receive()
do GRO via udp_sk(sk)->gro_receive.
The check implemented in this patch is broader than what is strictly
needed, as the existing UDP tunnel could be e.g. configured on top of
a different device: we could end-up skipping GRO at-all for some packets.
Anyhow, that is a very thin corner case and covering it will add quite
a bit of complexity.
v1 -> v2:
- hopefully clarify the commit message
CVSS Score
5.5
EPSS Score
0.0
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
ASoC: q6afe-clocks: fix reprobing of the driver
Q6afe-clocks driver can get reprobed. For example if the APR services
are restarted after the firmware crash. However currently Q6afe-clocks
driver will oops because hw.init will get cleared during first _probe
call. Rewrite the driver to fill the clock data at runtime rather than
using big static array of clocks.
CVSS Score
5.5
EPSS Score
0.0
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: avoid deadlock between hci_dev->lock and socket lock
Commit eab2404ba798 ("Bluetooth: Add BT_PHY socket option") added a
dependency between socket lock and hci_dev->lock that could lead to
deadlock.
It turns out that hci_conn_get_phy() is not in any way relying on hdev
being immutable during the runtime of this function, neither does it even
look at any of the members of hdev, and as such there is no need to hold
that lock.
This fixes the lockdep splat below:
======================================================
WARNING: possible circular locking dependency detected
5.12.0-rc1-00026-g73d464503354 #10 Not tainted
------------------------------------------------------
bluetoothd/1118 is trying to acquire lock:
ffff8f078383c078 (&hdev->lock){+.+.}-{3:3}, at: hci_conn_get_phy+0x1c/0x150 [bluetooth]
but task is already holding lock:
ffff8f07e831d920 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}, at: l2cap_sock_getsockopt+0x8b/0x610
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}:
lock_sock_nested+0x72/0xa0
l2cap_sock_ready_cb+0x18/0x70 [bluetooth]
l2cap_config_rsp+0x27a/0x520 [bluetooth]
l2cap_sig_channel+0x658/0x1330 [bluetooth]
l2cap_recv_frame+0x1ba/0x310 [bluetooth]
hci_rx_work+0x1cc/0x640 [bluetooth]
process_one_work+0x244/0x5f0
worker_thread+0x3c/0x380
kthread+0x13e/0x160
ret_from_fork+0x22/0x30
-> #2 (&chan->lock#2/1){+.+.}-{3:3}:
__mutex_lock+0xa3/0xa10
l2cap_chan_connect+0x33a/0x940 [bluetooth]
l2cap_sock_connect+0x141/0x2a0 [bluetooth]
__sys_connect+0x9b/0xc0
__x64_sys_connect+0x16/0x20
do_syscall_64+0x33/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #1 (&conn->chan_lock){+.+.}-{3:3}:
__mutex_lock+0xa3/0xa10
l2cap_chan_connect+0x322/0x940 [bluetooth]
l2cap_sock_connect+0x141/0x2a0 [bluetooth]
__sys_connect+0x9b/0xc0
__x64_sys_connect+0x16/0x20
do_syscall_64+0x33/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #0 (&hdev->lock){+.+.}-{3:3}:
__lock_acquire+0x147a/0x1a50
lock_acquire+0x277/0x3d0
__mutex_lock+0xa3/0xa10
hci_conn_get_phy+0x1c/0x150 [bluetooth]
l2cap_sock_getsockopt+0x5a9/0x610 [bluetooth]
__sys_getsockopt+0xcc/0x200
__x64_sys_getsockopt+0x20/0x30
do_syscall_64+0x33/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
other info that might help us debug this:
Chain exists of:
&hdev->lock --> &chan->lock#2/1 --> sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP);
lock(&chan->lock#2/1);
lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP);
lock(&hdev->lock);
*** DEADLOCK ***
1 lock held by bluetoothd/1118:
#0: ffff8f07e831d920 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}, at: l2cap_sock_getsockopt+0x8b/0x610 [bluetooth]
stack backtrace:
CPU: 3 PID: 1118 Comm: bluetoothd Not tainted 5.12.0-rc1-00026-g73d464503354 #10
Hardware name: LENOVO 20K5S22R00/20K5S22R00, BIOS R0IET38W (1.16 ) 05/31/2017
Call Trace:
dump_stack+0x7f/0xa1
check_noncircular+0x105/0x120
? __lock_acquire+0x147a/0x1a50
__lock_acquire+0x147a/0x1a50
lock_acquire+0x277/0x3d0
? hci_conn_get_phy+0x1c/0x150 [bluetooth]
? __lock_acquire+0x2e1/0x1a50
? lock_is_held_type+0xb4/0x120
? hci_conn_get_phy+0x1c/0x150 [bluetooth]
__mutex_lock+0xa3/0xa10
? hci_conn_get_phy+0x1c/0x150 [bluetooth]
? lock_acquire+0x277/0x3d0
? mark_held_locks+0x49/0x70
? mark_held_locks+0x49/0x70
? hci_conn_get_phy+0x1c/0x150 [bluetooth]
hci_conn_get_phy+0x
---truncated---
CVSS Score
5.5
EPSS Score
0.0
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
ataflop: potential out of bounds in do_format()
The function uses "type" as an array index:
q = unit[drive].disk[type]->queue;
Unfortunately the bounds check on "type" isn't done until later in the
function. Fix this by moving the bounds check to the start.
CVSS Score
7.1
EPSS Score
0.0
Published
2024-02-28
In the Linux kernel, the following vulnerability has been resolved:
io_uring: fix overflows checks in provide buffers
Colin reported before possible overflow and sign extension problems in
io_provide_buffers_prep(). As Linus pointed out previous attempt did nothing
useful, see d81269fecb8ce ("io_uring: fix provide_buffers sign extension").
Do that with help of check_<op>_overflow helpers. And fix struct
io_provide_buf::len type, as it doesn't make much sense to keep it
signed.
CVSS Score
7.8
EPSS Score
0.0
Published
2024-02-28