In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()
syzbot found hanging tasks waiting on rtnl_lock [1]
A reproducer is available in the syzbot bug.
When a request to add multiple actions with the same index is sent, the
second request will block forever on the first request. This holds
rtnl_lock, and causes tasks to hang.
Return -EAGAIN to prevent infinite looping, while keeping documented
behavior.
[1]
INFO: task kworker/1:0:5088 blocked for more than 143 seconds.
Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0
“echo 0 > /proc/sys/kernel/hung_task_timeout_secs” disables this message.
task:kworker/1:0 state:D stack:23744 pid:5088 tgid:5088 ppid:2 flags:0x00004000
Workqueue: events_power_efficient reg_check_chans_work
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6746
__schedule_loop kernel/sched/core.c:6823 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6838
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
wiphy_lock include/net/cfg80211.h:5953 [inline]
reg_leave_invalid_chans net/wireless/reg.c:2466 [inline]
reg_check_chans_work+0x10a/0x10e0 net/wireless/reg.c:2481
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/sched/act_api.c"
],
"versions": [
{
"version": "0190c1d452a9",
"lessThan": "0d8a2d287c8a",
"status": "affected",
"versionType": "git"
},
{
"version": "0190c1d452a9",
"lessThan": "c6a7da65a296",
"status": "affected",
"versionType": "git"
},
{
"version": "0190c1d452a9",
"lessThan": "25987a97eec4",
"status": "affected",
"versionType": "git"
},
{
"version": "0190c1d452a9",
"lessThan": "6fc78d67f51a",
"status": "affected",
"versionType": "git"
},
{
"version": "0190c1d452a9",
"lessThan": "5f926aa96b08",
"status": "affected",
"versionType": "git"
},
{
"version": "0190c1d452a9",
"lessThan": "7a0e497b597d",
"status": "affected",
"versionType": "git"
},
{
"version": "0190c1d452a9",
"lessThan": "d864319871b0",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/sched/act_api.c"
],
"versions": [
{
"version": "4.19",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.19",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.279",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.221",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.162",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.96",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.36",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.9.7",
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74
git.kernel.org/stable/c/25987a97eec4d5f897cd04ee1b45170829c610da
git.kernel.org/stable/c/5f926aa96b08b6c47178fe1171e7ae331c695fc2
git.kernel.org/stable/c/6fc78d67f51aeb9a542d39a8714e16bc411582d4
git.kernel.org/stable/c/7a0e497b597df7c4cf2b63fc6e9188b6cabe5335
git.kernel.org/stable/c/c6a7da65a296745535a964be1019ec7691b0cb90
git.kernel.org/stable/c/d864319871b05fadd153e0aede4811ca7008f5d6