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Date: Wed, 16 Jan 2019 10:31:47 -0600
From: Corey Minyard <minyard@....org>
To: Yang Yingliang <yangyingliang@...wei.com>, cminyard@...sta.com,
arnd@...db.de, gregkh@...uxfoundation.org
Cc: openipmi-developer@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [Openipmi-developer] [PATCH] ipmi: fix use-after-free of
user->release_barrier.rda
On 1/15/19 11:33 PM, Yang Yingliang wrote:
> When we do the following test, we got oops in ipmi_msghandler driver
> while((1))
> do
> service ipmievd restart & service ipmievd restart
> done
Thanks, I have this queued and will get it in to 5.0, with stable backports.
This should be a new issue for 4.19.
-corey
> ---------------------------------------------------------------
> [ 294.230186] Unable to handle kernel paging request at virtual address 0000803fea6ea008
> [ 294.230188] Mem abort info:
> [ 294.230190] ESR = 0x96000004
> [ 294.230191] Exception class = DABT (current EL), IL = 32 bits
> [ 294.230193] SET = 0, FnV = 0
> [ 294.230194] EA = 0, S1PTW = 0
> [ 294.230195] Data abort info:
> [ 294.230196] ISV = 0, ISS = 0x00000004
> [ 294.230197] CM = 0, WnR = 0
> [ 294.230199] user pgtable: 4k pages, 48-bit VAs, pgdp = 00000000a1c1b75a
> [ 294.230201] [0000803fea6ea008] pgd=0000000000000000
> [ 294.230204] Internal error: Oops: 96000004 [#1] SMP
> [ 294.235211] Modules linked in: nls_utf8 isofs rpcrdma ib_iser ib_srpt target_core_mod ib_srp scsi_transport_srp ib_ipoib rdma_ucm ib_umad rdma_cm ib_cm iw_cm dm_mirror dm_region_hash dm_log dm_mod aes_ce_blk crypto_simd cryptd aes_ce_cipher ghash_ce sha2_ce ses sha256_arm64 sha1_ce hibmc_drm hisi_sas_v2_hw enclosure sg hisi_sas_main sbsa_gwdt ip_tables mlx5_ib ib_uverbs marvell ib_core mlx5_core ixgbe ipmi_si mdio hns_dsaf ipmi_devintf ipmi_msghandler hns_enet_drv hns_mdio
> [ 294.277745] CPU: 3 PID: 0 Comm: swapper/3 Kdump: loaded Not tainted 5.0.0-rc2+ #113
> [ 294.285511] Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.37 11/21/2017
> [ 294.292835] pstate: 80000005 (Nzcv daif -PAN -UAO)
> [ 294.297695] pc : __srcu_read_lock+0x38/0x58
> [ 294.301940] lr : acquire_ipmi_user+0x2c/0x70 [ipmi_msghandler]
> [ 294.307853] sp : ffff00001001bc80
> [ 294.311208] x29: ffff00001001bc80 x28: ffff0000117e5000
> [ 294.316594] x27: 0000000000000000 x26: dead000000000100
> [ 294.321980] x25: dead000000000200 x24: ffff803f6bd06800
> [ 294.327366] x23: 0000000000000000 x22: 0000000000000000
> [ 294.332752] x21: ffff00001001bd04 x20: ffff80df33d19018
> [ 294.338137] x19: ffff80df33d19018 x18: 0000000000000000
> [ 294.343523] x17: 0000000000000000 x16: 0000000000000000
> [ 294.348908] x15: 0000000000000000 x14: 0000000000000002
> [ 294.354293] x13: 0000000000000000 x12: 0000000000000000
> [ 294.359679] x11: 0000000000000000 x10: 0000000000100000
> [ 294.365065] x9 : 0000000000000000 x8 : 0000000000000004
> [ 294.370451] x7 : 0000000000000000 x6 : ffff80df34558678
> [ 294.375836] x5 : 000000000000000c x4 : 0000000000000000
> [ 294.381221] x3 : 0000000000000001 x2 : 0000803fea6ea000
> [ 294.386607] x1 : 0000803fea6ea008 x0 : 0000000000000001
> [ 294.391994] Process swapper/3 (pid: 0, stack limit = 0x0000000083087293)
> [ 294.398791] Call trace:
> [ 294.401266] __srcu_read_lock+0x38/0x58
> [ 294.405154] acquire_ipmi_user+0x2c/0x70 [ipmi_msghandler]
> [ 294.410716] deliver_response+0x80/0xf8 [ipmi_msghandler]
> [ 294.416189] deliver_local_response+0x28/0x68 [ipmi_msghandler]
> [ 294.422193] handle_one_recv_msg+0x158/0xcf8 [ipmi_msghandler]
> [ 294.432050] handle_new_recv_msgs+0xc0/0x210 [ipmi_msghandler]
> [ 294.441984] smi_recv_tasklet+0x8c/0x158 [ipmi_msghandler]
> [ 294.451618] tasklet_action_common.isra.5+0x88/0x138
> [ 294.460661] tasklet_action+0x2c/0x38
> [ 294.468191] __do_softirq+0x120/0x2f8
> [ 294.475561] irq_exit+0x134/0x140
> [ 294.482445] __handle_domain_irq+0x6c/0xc0
> [ 294.489954] gic_handle_irq+0xb8/0x178
> [ 294.497037] el1_irq+0xb0/0x140
> [ 294.503381] arch_cpu_idle+0x34/0x1a8
> [ 294.510096] do_idle+0x1d4/0x290
> [ 294.516322] cpu_startup_entry+0x28/0x30
> [ 294.523230] secondary_start_kernel+0x184/0x1d0
> [ 294.530657] Code: d538d082 d2800023 8b010c81 8b020021 (c85f7c25)
> [ 294.539746] ---[ end trace 8a7a880dee570b29 ]---
> [ 294.547341] Kernel panic - not syncing: Fatal exception in interrupt
> [ 294.556837] SMP: stopping secondary CPUs
> [ 294.563996] Kernel Offset: disabled
> [ 294.570515] CPU features: 0x002,21006008
> [ 294.577638] Memory Limit: none
> [ 294.587178] Starting crashdump kernel...
> [ 294.594314] Bye!
>
> Because the user->release_barrier.rda is freed in ipmi_destroy_user(), but
> the refcount is not zero, when acquire_ipmi_user() uses user->release_barrier.rda
> in __srcu_read_lock(), it causes oops.
> Fix this by calling cleanup_srcu_struct() when the refcount is zero.
>
> Fixes: e86ee2d44b44 ("ipmi: Rework locking and shutdown for hot remove")
> Cc: stable@...r.kernel.org
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
> drivers/char/ipmi/ipmi_msghandler.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
> index a74ce88..6c26533 100644
> --- a/drivers/char/ipmi/ipmi_msghandler.c
> +++ b/drivers/char/ipmi/ipmi_msghandler.c
> @@ -1183,6 +1183,7 @@ int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data)
> static void free_user(struct kref *ref)
> {
> struct ipmi_user *user = container_of(ref, struct ipmi_user, refcount);
> + cleanup_srcu_struct(&user->release_barrier);
> kfree(user);
> }
>
> @@ -1259,7 +1260,6 @@ int ipmi_destroy_user(struct ipmi_user *user)
> {
> _ipmi_destroy_user(user);
>
> - cleanup_srcu_struct(&user->release_barrier);
> kref_put(&user->refcount, free_user);
>
> return 0;
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