On Mon, 11 Nov 2024, Lee Jones wrote: > From: Dmitry Antipov <dmantipov@xxxxxxxxx> > > [ Upstream commit b22db8b8befe90b61c98626ca1a2fbb0505e9fe3 ] > > Fix possible use-after-free in 'taprio_dump()' by adding RCU > read-side critical section there. Never seen on x86 but > found on a KASAN-enabled arm64 system when investigating > https://syzkaller.appspot.com/bug?extid=b65e0af58423fc8a73aa: > > [T15862] BUG: KASAN: slab-use-after-free in taprio_dump+0xa0c/0xbb0 > [T15862] Read of size 4 at addr ffff0000d4bb88f8 by task repro/15862 > [T15862] > [T15862] CPU: 0 UID: 0 PID: 15862 Comm: repro Not tainted 6.11.0-rc1-00293-gdefaf1a2113a-dirty #2 > [T15862] Hardware name: QEMU QEMU Virtual Machine, BIOS edk2-20240524-5.fc40 05/24/2024 > [T15862] Call trace: > [T15862] dump_backtrace+0x20c/0x220 > [T15862] show_stack+0x2c/0x40 > [T15862] dump_stack_lvl+0xf8/0x174 > [T15862] print_report+0x170/0x4d8 > [T15862] kasan_report+0xb8/0x1d4 > [T15862] __asan_report_load4_noabort+0x20/0x2c > [T15862] taprio_dump+0xa0c/0xbb0 > [T15862] tc_fill_qdisc+0x540/0x1020 > [T15862] qdisc_notify.isra.0+0x330/0x3a0 > [T15862] tc_modify_qdisc+0x7b8/0x1838 > [T15862] rtnetlink_rcv_msg+0x3c8/0xc20 > [T15862] netlink_rcv_skb+0x1f8/0x3d4 > [T15862] rtnetlink_rcv+0x28/0x40 > [T15862] netlink_unicast+0x51c/0x790 > [T15862] netlink_sendmsg+0x79c/0xc20 > [T15862] __sock_sendmsg+0xe0/0x1a0 > [T15862] ____sys_sendmsg+0x6c0/0x840 > [T15862] ___sys_sendmsg+0x1ac/0x1f0 > [T15862] __sys_sendmsg+0x110/0x1d0 > [T15862] __arm64_sys_sendmsg+0x74/0xb0 > [T15862] invoke_syscall+0x88/0x2e0 > [T15862] el0_svc_common.constprop.0+0xe4/0x2a0 > [T15862] do_el0_svc+0x44/0x60 > [T15862] el0_svc+0x50/0x184 > [T15862] el0t_64_sync_handler+0x120/0x12c > [T15862] el0t_64_sync+0x190/0x194 > [T15862] > [T15862] Allocated by task 15857: > [T15862] kasan_save_stack+0x3c/0x70 > [T15862] kasan_save_track+0x20/0x3c > [T15862] kasan_save_alloc_info+0x40/0x60 > [T15862] __kasan_kmalloc+0xd4/0xe0 > [T15862] __kmalloc_cache_noprof+0x194/0x334 > [T15862] taprio_change+0x45c/0x2fe0 > [T15862] tc_modify_qdisc+0x6a8/0x1838 > [T15862] rtnetlink_rcv_msg+0x3c8/0xc20 > [T15862] netlink_rcv_skb+0x1f8/0x3d4 > [T15862] rtnetlink_rcv+0x28/0x40 > [T15862] netlink_unicast+0x51c/0x790 > [T15862] netlink_sendmsg+0x79c/0xc20 > [T15862] __sock_sendmsg+0xe0/0x1a0 > [T15862] ____sys_sendmsg+0x6c0/0x840 > [T15862] ___sys_sendmsg+0x1ac/0x1f0 > [T15862] __sys_sendmsg+0x110/0x1d0 > [T15862] __arm64_sys_sendmsg+0x74/0xb0 > [T15862] invoke_syscall+0x88/0x2e0 > [T15862] el0_svc_common.constprop.0+0xe4/0x2a0 > [T15862] do_el0_svc+0x44/0x60 > [T15862] el0_svc+0x50/0x184 > [T15862] el0t_64_sync_handler+0x120/0x12c > [T15862] el0t_64_sync+0x190/0x194 > [T15862] > [T15862] Freed by task 6192: > [T15862] kasan_save_stack+0x3c/0x70 > [T15862] kasan_save_track+0x20/0x3c > [T15862] kasan_save_free_info+0x4c/0x80 > [T15862] poison_slab_object+0x110/0x160 > [T15862] __kasan_slab_free+0x3c/0x74 > [T15862] kfree+0x134/0x3c0 > [T15862] taprio_free_sched_cb+0x18c/0x220 > [T15862] rcu_core+0x920/0x1b7c > [T15862] rcu_core_si+0x10/0x1c > [T15862] handle_softirqs+0x2e8/0xd64 > [T15862] __do_softirq+0x14/0x20 > > Fixes: 18cdd2f0998a ("net/sched: taprio: taprio_dump and taprio_change are protected by rtnl_mutex") > Acked-by: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx> > Signed-off-by: Dmitry Antipov <dmantipov@xxxxxxxxx> > Link: https://patch.msgid.link/20241018051339.418890-2-dmantipov@xxxxxxxxx > Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx> > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> > (cherry picked from commit 5d282467245f267c0b9ada3f7f309ff838521536) > [Lee: Backported from linux-6.6.y to linux-6.1.y and fixed conflicts] > Signed-off-by: Lee Jones <lee@xxxxxxxxxx> This patch should have made it into linux-6.1.y but there were merge-conflicts. I fixed them and this is the result. -- Lee Jones [李琼斯]
