[SRU][J/N][PATCH v4 0/1] CVE-2025-37752

[Tim Whisonant]

SRU Justification:

[Impact]

net_sched: sch_sfq: move the limit validation

It is not sufficient to directly validate the limit on the data that
the user passes as it can be updated based on how the other parameters
are changed.

Move the check at the end of the configuration update process to also
catch scenarios where the limit is indirectly updated, for example
with the following configurations:

tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1
tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1

This fixes the following syzkaller reported crash:

------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6
index 65535 is out of range for type 'struct sfq_head[128]'
CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429
 sfq_link net/sched/sch_sfq.c:203 [inline]
 sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231
 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493
 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518
 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035
 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339
 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035
 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311
 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline]
 dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375

[Fix]

Plucky:   fixed separately
Noble:    backported from upstream
Jammy:    applied Focal patches
Focal:    patch sent to ESM ML
Bionic:   patch sent to ESM ML
Xenial:   patch sent to ESM ML
Trusty:   out of scope (medium CVE)

[Test Plan]

Compile and boot tested.

[Where problems could occur]

The changes occur in the network stochastic fairness queueing
discipline implementation. Issues may appear as anomolies related
to that queueing discipline.

[Notes]

v2 - Review feedback on v1 indicated that more description was needed
in the backport note. v2 corrects this. v1 also included
a prerequisite commit 8c0cea59d40c ("net_sched: sch_sfq: use a temporary
work area for validating configuration"). Upon further inspection,
this was determined to be unneeded by the fix commit and was refactored
out of the backport.

v3 - After v2 was submitted, an update to the Oracular kernel applied
the fix commit. v3 removes the Oracular patch.

v4 - Review of v3 revealed that the Noble patch was errantly removing
the NL_SET_ERR_MSG_MOD() macro call.

Octavian Purdila (1):
  net_sched: sch_sfq: move the limit validation

 net/sched/sch_sfq.c | 5 +++++
 1 file changed, 5 insertions(+)

-- 
2.43.0