Message-ID: <SJ0PR11MB5866FAB43E70D894B827DC36E5212@SJ0PR11MB5866.namprd11.prod.outlook.com>
Date: Wed, 6 Mar 2024 20:08:48 +0000
From: "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>
To: Simon Horman <horms@...nel.org>, "Brandeburg, Jesse"
	<jesse.brandeburg@...el.com>
CC: "pmenzel@...gen.mpg.de" <pmenzel@...gen.mpg.de>, Michal Swiatkowski
	<michal.swiatkowski@...ux.intel.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, Eric Dumazet <edumazet@...gle.com>, "Nguyen,
 Anthony L" <anthony.l.nguyen@...el.com>, Jakub Kicinski <kuba@...nel.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>, "Paolo
 Abeni" <pabeni@...hat.com>, "David S. Miller" <davem@...emloft.net>,
	"Elliott, Rob" <elliott@....com>
Subject: RE: [Intel-wired-lan] [PATCH iwl-net v2] ice: fix memory corruption
 bug with suspend and rebuild



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On
> Behalf Of Simon Horman
> Sent: Wednesday, March 6, 2024 9:04 PM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>
> Cc: pmenzel@...gen.mpg.de; Michal Swiatkowski
> <michal.swiatkowski@...ux.intel.com>; netdev@...r.kernel.org;
> Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>; Eric Dumazet
> <edumazet@...gle.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>; Jakub Kicinski <kuba@...nel.org>;
> intel-wired-lan@...ts.osuosl.org; Paolo Abeni <pabeni@...hat.com>;
> David S. Miller <davem@...emloft.net>; Elliott, Rob
> <elliott@....com>
> Subject: Re: [Intel-wired-lan] [PATCH iwl-net v2] ice: fix memory
> corruption bug with suspend and rebuild
> 
> On Tue, Mar 05, 2024 at 03:02:03PM -0800, Jesse Brandeburg wrote:
> > The ice driver would previously panic after suspend. This is
> caused
> > from the driver *only* calling the ice_vsi_free_q_vectors()
> function
> > by itself, when it is suspending. Since commit b3e7b3a6ee92
> ("ice:
> > prevent NULL pointer deref during reload") the driver has zeroed
> out
> > num_q_vectors, and only restored it in ice_vsi_cfg_def().
> >
> > This further causes the ice_rebuild() function to allocate a zero
> > length buffer, after which num_q_vectors is updated, and then the
> new
> > value of num_q_vectors is used to index into the zero length
> buffer,
> > which corrupts memory.
> >
> > The fix entails making sure all the code referencing
> num_q_vectors
> > only does so after it has been reset via ice_vsi_cfg_def().
> >
> > I didn't perform a full bisect, but I was able to test against
> 6.1.77
> > kernel and that ice driver works fine for suspend/resume with no
> > panic, so sometime since then, this problem was introduced.
> >
> > Also clean up an un-needed init of a local variable in the
> function
> > being modified.
> >
> > PANIC from 6.8.0-rc1:
> >
> > [1026674.915596] PM: suspend exit
> > [1026675.664697] ice 0000:17:00.1: PTP reset successful
> > [1026675.664707] ice 0000:17:00.1: 2755 msecs passed between
> update to
> > cached PHC time [1026675.667660] ice 0000:b1:00.0: PTP reset
> > successful [1026675.675944] ice 0000:b1:00.0: 2832 msecs passed
> > between update to cached PHC time [1026677.137733] ixgbe
> 0000:31:00.0
> > ens787: NIC Link is Up 1 Gbps, Flow Control: None
> [1026677.190201]
> > BUG: kernel NULL pointer dereference, address: 0000000000000010
> > [1026677.192753] ice 0000:17:00.0: PTP reset successful
> > [1026677.192764] ice 0000:17:00.0: 4548 msecs passed between
> update to
> > cached PHC time [1026677.197928] #PF: supervisor read access in
> kernel
> > mode [1026677.197933] #PF: error_code(0x0000) - not-present page
> > [1026677.197937] PGD 1557a7067 P4D 0 [1026677.212133] ice
> > 0000:b1:00.1: PTP reset successful [1026677.212143] ice
> 0000:b1:00.1:
> > 4344 msecs passed between update to cached PHC time
> [1026677.212575]
> > [1026677.243142] Oops: 0000 [#1] PREEMPT SMP NOPTI
> > [1026677.247918] CPU: 23 PID: 42790 Comm: kworker/23:0 Kdump:
> loaded Tainted: G        W          6.8.0-rc1+ #1
> > [1026677.257989] Hardware name: Intel Corporation
> > M50CYP2SBSTD/M50CYP2SBSTD, BIOS SE5C620.86B.01.01.0005.2202160810
> > 02/16/2022 [1026677.269367] Workqueue: ice ice_service_task [ice]
> > [1026677.274592] RIP:
> 0010:ice_vsi_rebuild_set_coalesce+0x130/0x1e0
> > [ice] [1026677.281421] Code: 0f 84 3a ff ff ff 41 0f b7 74 ec 02
> 66 89
> > b0 22 02 00 00 81 e6 ff 1f 00 00 e8 ec fd ff ff e9 35 ff ff ff 48
> 8b
> > 43 30 49 63 ed <41> 0f b7 34 24 41 83 c5 01 48 8b 3c e8 66 89 b7
> aa 02
> > 00 00 81 e6 [1026677.300877] RSP: 0018:ff3be62a6399bcc0 EFLAGS:
> > 00010202 [1026677.306556] RAX: ff28691e28980828 RBX:
> ff28691e41099828
> > RCX: 0000000000188000 [1026677.314148] RDX: 0000000000000000 RSI:
> > 0000000000000010 RDI: ff28691e41099828 [1026677.321730] RBP:
> > 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> > [1026677.329311] R10: 0000000000000007 R11: ffffffffffffffc0 R12:
> > 0000000000000010 [1026677.336896] R13: 0000000000000000 R14:
> > 0000000000000000 R15: ff28691e0eaa81a0 [1026677.344472] FS:
> > 0000000000000000(0000) GS:ff28693cbffc0000(0000)
> > knlGS:0000000000000000 [1026677.353000] CS:  0010 DS: 0000 ES:
> 0000 CR0: 0000000080050033 [1026677.359195] CR2: 0000000000000010
> CR3: 0000000128df4001 CR4: 0000000000771ef0 [1026677.366779] DR0:
> 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [1026677.374369] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400 [1026677.381952] PKRU: 55555554 [1026677.385116]
> Call Trace:
> > [1026677.388023]  <TASK>
> > [1026677.390589]  ? __die+0x20/0x70
> > [1026677.394105]  ? page_fault_oops+0x82/0x160 [1026677.398576]
> ?
> > do_user_addr_fault+0x65/0x6a0 [1026677.403307]  ?
> > exc_page_fault+0x6a/0x150 [1026677.407694]  ?
> > asm_exc_page_fault+0x22/0x30 [1026677.412349]  ?
> > ice_vsi_rebuild_set_coalesce+0x130/0x1e0 [ice] [1026677.418614]
> > ice_vsi_rebuild+0x34b/0x3c0 [ice] [1026677.423583]
> > ice_vsi_rebuild_by_type+0x76/0x180 [ice] [1026677.429147]
> > ice_rebuild+0x18b/0x520 [ice] [1026677.433746]  ?
> delay_tsc+0x8f/0xc0
> > [1026677.437630]  ice_do_reset+0xa3/0x190 [ice] [1026677.442231]
> > ice_service_task+0x26/0x440 [ice] [1026677.447180]
> > process_one_work+0x174/0x340 [1026677.451669]
> > worker_thread+0x27e/0x390 [1026677.455890]  ?
> > __pfx_worker_thread+0x10/0x10 [1026677.460627]
> kthread+0xee/0x120
> > [1026677.464235]  ? __pfx_kthread+0x10/0x10 [1026677.468445]
> > ret_from_fork+0x2d/0x50 [1026677.472476]  ?
> __pfx_kthread+0x10/0x10
> > [1026677.476671]  ret_from_fork_asm+0x1b/0x30 [1026677.481050]
> > </TASK>
> >
> > Fixes: b3e7b3a6ee92 ("ice: prevent NULL pointer deref during
> reload")
> > Reported-by: Robert Elliott <elliott@....com>
> > Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> > ---
> > v2: fix uninitialized coalesce pointer on the exit path by moving
> the
> > kfree to the later goto (simon), reword commit message (paul)
> 
> Thanks for the update.
> 
> Reviewed-by: Simon Horman <horms@...nel.org>

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>

> 
> > ---
> >  drivers/net/ethernet/intel/ice/ice_lib.c | 18 +++++++++---------
> >  1 file changed, 9 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c
> > b/drivers/net/ethernet/intel/ice/ice_lib.c
> > index fc23dbe302b4..cfc20684f25a 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_lib.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_lib.c
> > @@ -3238,7 +3238,7 @@ int ice_vsi_rebuild(struct ice_vsi *vsi,
> u32
> > vsi_flags)  {
> >  	struct ice_vsi_cfg_params params = {};
> >  	struct ice_coalesce_stored *coalesce;
> > -	int prev_num_q_vectors = 0;
> > +	int prev_num_q_vectors;
> >  	struct ice_pf *pf;
> >  	int ret;
> >
> > @@ -3252,13 +3252,6 @@ int ice_vsi_rebuild(struct ice_vsi *vsi,
> u32 vsi_flags)
> >  	if (WARN_ON(vsi->type == ICE_VSI_VF && !vsi->vf))
> >  		return -EINVAL;
> >
> > -	coalesce = kcalloc(vsi->num_q_vectors,
> > -			   sizeof(struct ice_coalesce_stored),
> GFP_KERNEL);
> > -	if (!coalesce)
> > -		return -ENOMEM;
> > -
> > -	prev_num_q_vectors = ice_vsi_rebuild_get_coalesce(vsi,
> coalesce);
> > -
> >  	ret = ice_vsi_realloc_stat_arrays(vsi);
> >  	if (ret)
> >  		goto err_vsi_cfg;
> > @@ -3268,6 +3261,13 @@ int ice_vsi_rebuild(struct ice_vsi *vsi,
> u32 vsi_flags)
> >  	if (ret)
> >  		goto err_vsi_cfg;
> >
> > +	coalesce = kcalloc(vsi->num_q_vectors,
> > +			   sizeof(struct ice_coalesce_stored),
> GFP_KERNEL);
> > +	if (!coalesce)
> > +		return -ENOMEM;
> > +
> > +	prev_num_q_vectors = ice_vsi_rebuild_get_coalesce(vsi,
> coalesce);
> > +
> >  	ret = ice_vsi_cfg_tc_lan(pf, vsi);
> >  	if (ret) {
> >  		if (vsi_flags & ICE_VSI_FLAG_INIT) { @@ -3286,8 +3286,8
> @@ int
> > ice_vsi_rebuild(struct ice_vsi *vsi, u32 vsi_flags)
> >
> >  err_vsi_cfg_tc_lan:
> >  	ice_vsi_decfg(vsi);
> > -err_vsi_cfg:
> >  	kfree(coalesce);
> > +err_vsi_cfg:
> 
> FWIIW, I might have dropped the err_vsi_cfg label all together and
> simply returned at points that previously used it.
> 
> But that would not be functionally different to what you have done.
> 
> >  	return ret;
> >  }
> 
> ...

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