| CVE |
Vendors |
Products |
Updated |
CVSS v3.1 |
| In the Linux kernel, the following vulnerability has been resolved:
net: dsa: microchip: Added the condition for scheduling ksz_mib_read_work
When the ksz module is installed and removed using rmmod, kernel crashes
with null pointer dereferrence error. During rmmod, ksz_switch_remove
function tries to cancel the mib_read_workqueue using
cancel_delayed_work_sync routine and unregister switch from dsa.
During dsa_unregister_switch it calls ksz_mac_link_down, which in turn
reschedules the workqueue since mib_interval is non-zero.
Due to which queue executed after mib_interval and it tries to access
dp->slave. But the slave is unregistered in the ksz_switch_remove
function. Hence kernel crashes.
To avoid this crash, before canceling the workqueue, resetted the
mib_interval to 0.
v1 -> v2:
-Removed the if condition in ksz_mib_read_work |
| In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: Fix memory leak in mlx5_core_destroy_cq() error path
Prior to this patch in case mlx5_core_destroy_cq() failed it returns
without completing all destroy operations and that leads to memory leak.
Instead, complete the destroy flow before return error.
Also move mlx5_debug_cq_remove() to the beginning of mlx5_core_destroy_cq()
to be symmetrical with mlx5_core_create_cq().
kmemleak complains on:
unreferenced object 0xc000000038625100 (size 64):
comm "ethtool", pid 28301, jiffies 4298062946 (age 785.380s)
hex dump (first 32 bytes):
60 01 48 94 00 00 00 c0 b8 05 34 c3 00 00 00 c0 `.H.......4.....
02 00 00 00 00 00 00 00 00 db 7d c1 00 00 00 c0 ..........}.....
backtrace:
[<000000009e8643cb>] add_res_tree+0xd0/0x270 [mlx5_core]
[<00000000e7cb8e6c>] mlx5_debug_cq_add+0x5c/0xc0 [mlx5_core]
[<000000002a12918f>] mlx5_core_create_cq+0x1d0/0x2d0 [mlx5_core]
[<00000000cef0a696>] mlx5e_create_cq+0x210/0x3f0 [mlx5_core]
[<000000009c642c26>] mlx5e_open_cq+0xb4/0x130 [mlx5_core]
[<0000000058dfa578>] mlx5e_ptp_open+0x7f4/0xe10 [mlx5_core]
[<0000000081839561>] mlx5e_open_channels+0x9cc/0x13e0 [mlx5_core]
[<0000000009cf05d4>] mlx5e_switch_priv_channels+0xa4/0x230
[mlx5_core]
[<0000000042bbedd8>] mlx5e_safe_switch_params+0x14c/0x300
[mlx5_core]
[<0000000004bc9db8>] set_pflag_tx_port_ts+0x9c/0x160 [mlx5_core]
[<00000000a0553443>] mlx5e_set_priv_flags+0xd0/0x1b0 [mlx5_core]
[<00000000a8f3d84b>] ethnl_set_privflags+0x234/0x2d0
[<00000000fd27f27c>] genl_family_rcv_msg_doit+0x108/0x1d0
[<00000000f495e2bb>] genl_family_rcv_msg+0xe4/0x1f0
[<00000000646c5c2c>] genl_rcv_msg+0x78/0x120
[<00000000d53e384e>] netlink_rcv_skb+0x74/0x1a0 |
| In the Linux kernel, the following vulnerability has been resolved:
iio: adis16475: fix deadlock on frequency set
With commit 39c024b51b560
("iio: adis16475: improve sync scale mode handling"), two deadlocks were
introduced:
1) The call to 'adis_write_reg_16()' was not changed to it's unlocked
version.
2) The lock was not being released on the success path of the function.
This change fixes both these issues. |
| In the Linux kernel, the following vulnerability has been resolved:
scsi: iscsi: Fix iscsi_task use after free
Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn")
added iscsi_get_conn()/iscsi_put_conn() calls during abort handling but
then also changed the handling of the case where we detect an already
completed task where we now end up doing a goto to the common put/cleanup
code. This results in a iscsi_task use after free, because the common
cleanup code will do a put on the iscsi_task.
This reverts the goto and moves the iscsi_get_conn() to after we've checked
if the iscsi_task is valid. |
| In the Linux kernel, the following vulnerability has been resolved:
bpf, s390: Fix potential memory leak about jit_data
Make sure to free jit_data through kfree() in the error path. |
| In the Linux kernel, the following vulnerability has been resolved:
drm/nouveau/debugfs: fix file release memory leak
When using single_open() for opening, single_release() should be
called, otherwise the 'op' allocated in single_open() will be leaked. |
| In the Linux kernel, the following vulnerability has been resolved:
drm/nouveau/kms/nv50-: fix file release memory leak
When using single_open() for opening, single_release() should be
called, otherwise the 'op' allocated in single_open() will be leaked. |
| In the Linux kernel, the following vulnerability has been resolved:
drm/amdkfd: fix a potential ttm->sg memory leak
Memory is allocated for ttm->sg by kmalloc in kfd_mem_dmamap_userptr,
but isn't freed by kfree in kfd_mem_dmaunmap_userptr. Free it! |
| In the Linux kernel, the following vulnerability has been resolved:
net_sched: fix NULL deref in fifo_set_limit()
syzbot reported another NULL deref in fifo_set_limit() [1]
I could repro the issue with :
unshare -n
tc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit
tc qd replace dev lo parent 1:0 pfifo_fast
tc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit
pfifo_fast does not have a change() operation.
Make fifo_set_limit() more robust about this.
[1]
BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 14443 Comm: syz-executor959 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888024c27910 RDI: ffff888071e34000
RBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888024c27910
R13: ffff888071e34018 R14: 0000000000000000 R15: ffff88801ef74800
FS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
fifo_set_limit net/sched/sch_fifo.c:242 [inline]
fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227
tbf_change+0x6ec/0x16d0 net/sched/sch_tbf.c:418
qdisc_change net/sched/sch_api.c:1332 [inline]
tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
___sys_sendmsg+0xf3/0x170 net/socket.c:2463
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae |
| In the Linux kernel, the following vulnerability has been resolved:
libbpf: Fix memory leak in strset
Free struct strset itself, not just its internal parts. |
| In the Linux kernel, the following vulnerability has been resolved:
phy: mdio: fix memory leak
Syzbot reported memory leak in MDIO bus interface, the problem was in
wrong state logic.
MDIOBUS_ALLOCATED indicates 2 states:
1. Bus is only allocated
2. Bus allocated and __mdiobus_register() fails, but
device_register() was called
In case of device_register() has been called we should call put_device()
to correctly free the memory allocated for this device, but mdiobus_free()
calls just kfree(dev) in case of MDIOBUS_ALLOCATED state
To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED
_before_ calling device_register(), because put_device() should be
called even in case of device_register() failure. |
| In the Linux kernel, the following vulnerability has been resolved:
iwlwifi: mvm: Fix possible NULL dereference
In __iwl_mvm_remove_time_event() check that 'te_data->vif' is NULL
before dereferencing it. |
| In the Linux kernel, the following vulnerability has been resolved:
usb: chipidea: ci_hdrc_imx: Also search for 'phys' phandle
When passing 'phys' in the devicetree to describe the USB PHY phandle
(which is the recommended way according to
Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt) the
following NULL pointer dereference is observed on i.MX7 and i.MX8MM:
[ 1.489344] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098
[ 1.498170] Mem abort info:
[ 1.500966] ESR = 0x96000044
[ 1.504030] EC = 0x25: DABT (current EL), IL = 32 bits
[ 1.509356] SET = 0, FnV = 0
[ 1.512416] EA = 0, S1PTW = 0
[ 1.515569] FSC = 0x04: level 0 translation fault
[ 1.520458] Data abort info:
[ 1.523349] ISV = 0, ISS = 0x00000044
[ 1.527196] CM = 0, WnR = 1
[ 1.530176] [0000000000000098] user address but active_mm is swapper
[ 1.536544] Internal error: Oops: 96000044 [#1] PREEMPT SMP
[ 1.542125] Modules linked in:
[ 1.545190] CPU: 3 PID: 7 Comm: kworker/u8:0 Not tainted 5.14.0-dirty #3
[ 1.551901] Hardware name: Kontron i.MX8MM N801X S (DT)
[ 1.557133] Workqueue: events_unbound deferred_probe_work_func
[ 1.562984] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)
[ 1.568998] pc : imx7d_charger_detection+0x3f0/0x510
[ 1.573973] lr : imx7d_charger_detection+0x22c/0x510
This happens because the charger functions check for the phy presence
inside the imx_usbmisc_data structure (data->usb_phy), but the chipidea
core populates the usb_phy passed via 'phys' inside 'struct ci_hdrc'
(ci->usb_phy) instead.
This causes the NULL pointer dereference inside imx7d_charger_detection().
Fix it by also searching for 'phys' in case 'fsl,usbphy' is not found.
Tested on a imx7s-warp board. |
| In the Linux kernel, the following vulnerability has been resolved:
ext4: add error checking to ext4_ext_replay_set_iblocks()
If the call to ext4_map_blocks() fails due to an corrupted file
system, ext4_ext_replay_set_iblocks() can get stuck in an infinite
loop. This could be reproduced by running generic/526 with a file
system that has inline_data and fast_commit enabled. The system will
repeatedly log to the console:
EXT4-fs warning (device dm-3): ext4_block_to_path:105: block 1074800922 > max in inode 131076
and the stack that it gets stuck in is:
ext4_block_to_path+0xe3/0x130
ext4_ind_map_blocks+0x93/0x690
ext4_map_blocks+0x100/0x660
skip_hole+0x47/0x70
ext4_ext_replay_set_iblocks+0x223/0x440
ext4_fc_replay_inode+0x29e/0x3b0
ext4_fc_replay+0x278/0x550
do_one_pass+0x646/0xc10
jbd2_journal_recover+0x14a/0x270
jbd2_journal_load+0xc4/0x150
ext4_load_journal+0x1f3/0x490
ext4_fill_super+0x22d4/0x2c00
With this patch, generic/526 still fails, but system is no longer
locking up in a tight loop. It's likely the root casue is that
fast_commit replay is corrupting file systems with inline_data, and we
probably need to add better error handling in the fast commit replay
code path beyond what is done here, which essentially just breaks the
infinite loop without reporting the to the higher levels of the code. |
| In the Linux kernel, the following vulnerability has been resolved:
ipack: ipoctal: fix module reference leak
A reference to the carrier module was taken on every open but was only
released once when the final reference to the tty struct was dropped.
Fix this by taking the module reference and initialising the tty driver
data when installing the tty. |
| In the Linux kernel, the following vulnerability has been resolved:
net: sched: flower: protect fl_walk() with rcu
Patch that refactored fl_walk() to use idr_for_each_entry_continue_ul()
also removed rcu protection of individual filters which causes following
use-after-free when filter is deleted concurrently. Fix fl_walk() to obtain
rcu read lock while iterating and taking the filter reference and temporary
release the lock while calling arg->fn() callback that can sleep.
KASAN trace:
[ 352.773640] ==================================================================
[ 352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower]
[ 352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987
[ 352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2
[ 352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[ 352.781022] Call Trace:
[ 352.781573] dump_stack_lvl+0x46/0x5a
[ 352.782332] print_address_description.constprop.0+0x1f/0x140
[ 352.783400] ? fl_walk+0x159/0x240 [cls_flower]
[ 352.784292] ? fl_walk+0x159/0x240 [cls_flower]
[ 352.785138] kasan_report.cold+0x83/0xdf
[ 352.785851] ? fl_walk+0x159/0x240 [cls_flower]
[ 352.786587] kasan_check_range+0x145/0x1a0
[ 352.787337] fl_walk+0x159/0x240 [cls_flower]
[ 352.788163] ? fl_put+0x10/0x10 [cls_flower]
[ 352.789007] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220
[ 352.790102] tcf_chain_dump+0x231/0x450
[ 352.790878] ? tcf_chain_tp_delete_empty+0x170/0x170
[ 352.791833] ? __might_sleep+0x2e/0xc0
[ 352.792594] ? tfilter_notify+0x170/0x170
[ 352.793400] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220
[ 352.794477] tc_dump_tfilter+0x385/0x4b0
[ 352.795262] ? tc_new_tfilter+0x1180/0x1180
[ 352.796103] ? __mod_node_page_state+0x1f/0xc0
[ 352.796974] ? __build_skb_around+0x10e/0x130
[ 352.797826] netlink_dump+0x2c0/0x560
[ 352.798563] ? netlink_getsockopt+0x430/0x430
[ 352.799433] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220
[ 352.800542] __netlink_dump_start+0x356/0x440
[ 352.801397] rtnetlink_rcv_msg+0x3ff/0x550
[ 352.802190] ? tc_new_tfilter+0x1180/0x1180
[ 352.802872] ? rtnl_calcit.isra.0+0x1f0/0x1f0
[ 352.803668] ? tc_new_tfilter+0x1180/0x1180
[ 352.804344] ? _copy_from_iter_nocache+0x800/0x800
[ 352.805202] ? kasan_set_track+0x1c/0x30
[ 352.805900] netlink_rcv_skb+0xc6/0x1f0
[ 352.806587] ? rht_deferred_worker+0x6b0/0x6b0
[ 352.807455] ? rtnl_calcit.isra.0+0x1f0/0x1f0
[ 352.808324] ? netlink_ack+0x4d0/0x4d0
[ 352.809086] ? netlink_deliver_tap+0x62/0x3d0
[ 352.809951] netlink_unicast+0x353/0x480
[ 352.810744] ? netlink_attachskb+0x430/0x430
[ 352.811586] ? __alloc_skb+0xd7/0x200
[ 352.812349] netlink_sendmsg+0x396/0x680
[ 352.813132] ? netlink_unicast+0x480/0x480
[ 352.813952] ? __import_iovec+0x192/0x210
[ 352.814759] ? netlink_unicast+0x480/0x480
[ 352.815580] sock_sendmsg+0x6c/0x80
[ 352.816299] ____sys_sendmsg+0x3a5/0x3c0
[ 352.817096] ? kernel_sendmsg+0x30/0x30
[ 352.817873] ? __ia32_sys_recvmmsg+0x150/0x150
[ 352.818753] ___sys_sendmsg+0xd8/0x140
[ 352.819518] ? sendmsg_copy_msghdr+0x110/0x110
[ 352.820402] ? ___sys_recvmsg+0xf4/0x1a0
[ 352.821110] ? __copy_msghdr_from_user+0x260/0x260
[ 352.821934] ? _raw_spin_lock+0x81/0xd0
[ 352.822680] ? __handle_mm_fault+0xef3/0x1b20
[ 352.823549] ? rb_insert_color+0x2a/0x270
[ 352.824373] ? copy_page_range+0x16b0/0x16b0
[ 352.825209] ? perf_event_update_userpage+0x2d0/0x2d0
[ 352.826190] ? __fget_light+0xd9/0xf0
[ 352.826941] __sys_sendmsg+0xb3/0x130
[ 352.827613] ? __sys_sendmsg_sock+0x20/0x20
[ 352.828377] ? do_user_addr_fault+0x2c5/0x8a0
[ 352.829184] ? fpregs_assert_state_consistent+0x52/0x60
[ 352.830001] ? exit_to_user_mode_prepare+0x32/0x160
[ 352.830845] do_syscall_64+0x35/0x80
[ 352.831445] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 352.832331] RIP: 0033:0x7f7bee973c17
[
---truncated--- |
| In the Linux kernel, the following vulnerability has been resolved:
ixgbe: Fix NULL pointer dereference in ixgbe_xdp_setup
The ixgbe driver currently generates a NULL pointer dereference with
some machine (online cpus < 63). This is due to the fact that the
maximum value of num_xdp_queues is nr_cpu_ids. Code is in
"ixgbe_set_rss_queues"".
Here's how the problem repeats itself:
Some machine (online cpus < 63), And user set num_queues to 63 through
ethtool. Code is in the "ixgbe_set_channels",
adapter->ring_feature[RING_F_FDIR].limit = count;
It becomes 63.
When user use xdp, "ixgbe_set_rss_queues" will set queues num.
adapter->num_rx_queues = rss_i;
adapter->num_tx_queues = rss_i;
adapter->num_xdp_queues = ixgbe_xdp_queues(adapter);
And rss_i's value is from
f = &adapter->ring_feature[RING_F_FDIR];
rss_i = f->indices = f->limit;
So "num_rx_queues" > "num_xdp_queues", when run to "ixgbe_xdp_setup",
for (i = 0; i < adapter->num_rx_queues; i++)
if (adapter->xdp_ring[i]->xsk_umem)
It leads to panic.
Call trace:
[exception RIP: ixgbe_xdp+368]
RIP: ffffffffc02a76a0 RSP: ffff9fe16202f8d0 RFLAGS: 00010297
RAX: 0000000000000000 RBX: 0000000000000020 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000000000000001c RDI: ffffffffa94ead90
RBP: ffff92f8f24c0c18 R8: 0000000000000000 R9: 0000000000000000
R10: ffff9fe16202f830 R11: 0000000000000000 R12: ffff92f8f24c0000
R13: ffff9fe16202fc01 R14: 000000000000000a R15: ffffffffc02a7530
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
7 [ffff9fe16202f8f0] dev_xdp_install at ffffffffa89fbbcc
8 [ffff9fe16202f920] dev_change_xdp_fd at ffffffffa8a08808
9 [ffff9fe16202f960] do_setlink at ffffffffa8a20235
10 [ffff9fe16202fa88] rtnl_setlink at ffffffffa8a20384
11 [ffff9fe16202fc78] rtnetlink_rcv_msg at ffffffffa8a1a8dd
12 [ffff9fe16202fcf0] netlink_rcv_skb at ffffffffa8a717eb
13 [ffff9fe16202fd40] netlink_unicast at ffffffffa8a70f88
14 [ffff9fe16202fd80] netlink_sendmsg at ffffffffa8a71319
15 [ffff9fe16202fdf0] sock_sendmsg at ffffffffa89df290
16 [ffff9fe16202fe08] __sys_sendto at ffffffffa89e19c8
17 [ffff9fe16202ff30] __x64_sys_sendto at ffffffffa89e1a64
18 [ffff9fe16202ff38] do_syscall_64 at ffffffffa84042b9
19 [ffff9fe16202ff50] entry_SYSCALL_64_after_hwframe at ffffffffa8c0008c
So I fix ixgbe_max_channels so that it will not allow a setting of queues
to be higher than the num_online_cpus(). And when run to ixgbe_xdp_setup,
take the smaller value of num_rx_queues and num_xdp_queues. |
| In the Linux kernel, the following vulnerability has been resolved:
sctp: break out if skb_header_pointer returns NULL in sctp_rcv_ootb
We should always check if skb_header_pointer's return is NULL before
using it, otherwise it may cause null-ptr-deref, as syzbot reported:
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
RIP: 0010:sctp_rcv_ootb net/sctp/input.c:705 [inline]
RIP: 0010:sctp_rcv+0x1d84/0x3220 net/sctp/input.c:196
Call Trace:
<IRQ>
sctp6_rcv+0x38/0x60 net/sctp/ipv6.c:1109
ip6_protocol_deliver_rcu+0x2e9/0x1ca0 net/ipv6/ip6_input.c:422
ip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463
NF_HOOK include/linux/netfilter.h:307 [inline]
NF_HOOK include/linux/netfilter.h:301 [inline]
ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:472
dst_input include/net/dst.h:460 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
NF_HOOK include/linux/netfilter.h:301 [inline]
ipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c:297 |
| In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: unlink table before deleting it
syzbot reports following UAF:
BUG: KASAN: use-after-free in memcmp+0x18f/0x1c0 lib/string.c:955
nla_strcmp+0xf2/0x130 lib/nlattr.c:836
nft_table_lookup.part.0+0x1a2/0x460 net/netfilter/nf_tables_api.c:570
nft_table_lookup net/netfilter/nf_tables_api.c:4064 [inline]
nf_tables_getset+0x1b3/0x860 net/netfilter/nf_tables_api.c:4064
nfnetlink_rcv_msg+0x659/0x13f0 net/netfilter/nfnetlink.c:285
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
Problem is that all get operations are lockless, so the commit_mutex
held by nft_rcv_nl_event() isn't enough to stop a parallel GET request
from doing read-accesses to the table object even after synchronize_rcu().
To avoid this, unlink the table first and store the table objects in
on-stack scratch space. |
| In the Linux kernel, the following vulnerability has been resolved:
KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()
KASAN reports the following issue:
BUG: KASAN: stack-out-of-bounds in kvm_make_vcpus_request_mask+0x174/0x440 [kvm]
Read of size 8 at addr ffffc9001364f638 by task qemu-kvm/4798
CPU: 0 PID: 4798 Comm: qemu-kvm Tainted: G X --------- ---
Hardware name: AMD Corporation DAYTONA_X/DAYTONA_X, BIOS RYM0081C 07/13/2020
Call Trace:
dump_stack+0xa5/0xe6
print_address_description.constprop.0+0x18/0x130
? kvm_make_vcpus_request_mask+0x174/0x440 [kvm]
__kasan_report.cold+0x7f/0x114
? kvm_make_vcpus_request_mask+0x174/0x440 [kvm]
kasan_report+0x38/0x50
kasan_check_range+0xf5/0x1d0
kvm_make_vcpus_request_mask+0x174/0x440 [kvm]
kvm_make_scan_ioapic_request_mask+0x84/0xc0 [kvm]
? kvm_arch_exit+0x110/0x110 [kvm]
? sched_clock+0x5/0x10
ioapic_write_indirect+0x59f/0x9e0 [kvm]
? static_obj+0xc0/0xc0
? __lock_acquired+0x1d2/0x8c0
? kvm_ioapic_eoi_inject_work+0x120/0x120 [kvm]
The problem appears to be that 'vcpu_bitmap' is allocated as a single long
on stack and it should really be KVM_MAX_VCPUS long. We also seem to clear
the lower 16 bits of it with bitmap_zero() for no particular reason (my
guess would be that 'bitmap' and 'vcpu_bitmap' variables in
kvm_bitmap_or_dest_vcpus() caused the confusion: while the later is indeed
16-bit long, the later should accommodate all possible vCPUs). |
