From 4177d5b017a71433d4760889b88f7a29e11fad10 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Mon, 22 Nov 2021 16:01:51 +0100 Subject: net, neigh: Fix crash in v6 module initialization error path When IPv6 module gets initialized, but it's hitting an error in inet6_init() where it then needs to undo all the prior initialization work, it also might do a call to ndisc_cleanup() which then calls neigh_table_clear(). In there is a missing timer cancellation of the table's managed_work item. The kernel test robot explicitly triggered this error path and caused a UAF crash similar to the below: [...] [ 28.833183][ C0] BUG: unable to handle page fault for address: f7a43288 [ 28.833973][ C0] #PF: supervisor write access in kernel mode [ 28.834660][ C0] #PF: error_code(0x0002) - not-present page [ 28.835319][ C0] *pde = 06b2c067 *pte = 00000000 [ 28.835853][ C0] Oops: 0002 [#1] PREEMPT [ 28.836367][ C0] CPU: 0 PID: 303 Comm: sed Not tainted 5.16.0-rc1-00233-g83ff5faa0d3b #7 [ 28.837293][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1 04/01/2014 [ 28.838338][ C0] EIP: __run_timers.constprop.0+0x82/0x440 [...] [ 28.845607][ C0] Call Trace: [ 28.845942][ C0] [ 28.846333][ C0] ? check_preemption_disabled.isra.0+0x2a/0x80 [ 28.846975][ C0] ? __this_cpu_preempt_check+0x8/0xa [ 28.847570][ C0] run_timer_softirq+0xd/0x40 [ 28.848050][ C0] __do_softirq+0xf5/0x576 [ 28.848547][ C0] ? __softirqentry_text_start+0x10/0x10 [ 28.849127][ C0] do_softirq_own_stack+0x2b/0x40 [ 28.849749][ C0] [ 28.850087][ C0] irq_exit_rcu+0x7d/0xc0 [ 28.850587][ C0] common_interrupt+0x2a/0x40 [ 28.851068][ C0] asm_common_interrupt+0x119/0x120 [...] Note that IPv6 module cannot be unloaded as per 8ce440610357 ("ipv6: do not allow ipv6 module to be removed") hence this can only be seen during module initialization error. Tested with kernel test robot's reproducer. Fixes: 7482e3841d52 ("net, neigh: Add NTF_MANAGED flag for managed neighbor entries") Reported-by: kernel test robot Signed-off-by: Daniel Borkmann Cc: Li Zhijian Signed-off-by: David S. Miller --- net/core/neighbour.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net') diff --git a/net/core/neighbour.c b/net/core/neighbour.c index 47931c8be04b..72ba027c34cf 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -1779,6 +1779,7 @@ int neigh_table_clear(int index, struct neigh_table *tbl) { neigh_tables[index] = NULL; /* It is not clean... Fix it to unload IPv6 module safely */ + cancel_delayed_work_sync(&tbl->managed_work); cancel_delayed_work_sync(&tbl->gc_work); del_timer_sync(&tbl->proxy_timer); pneigh_queue_purge(&tbl->proxy_queue); -- cgit v1.2.3