linux-kernel - Re: [PATCH 1/4] KEYS: handle error code encoded in pointer

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Message-ID: <29159.1412340393@warthog.procyon.org.uk>
Date:	Fri, 03 Oct 2014 13:46:33 +0100
From:	David Howells <dhowells@...hat.com>
To:	Dmitry Kasatkin <d.kasatkin@...sung.com>
Cc:	dhowells@...hat.com, zohar@...ux.vnet.ibm.com,
	linux-ima-devel@...ts.sourceforge.net,
	linux-security-module@...r.kernel.org, jmorris@...ei.org,
	rusty@...tcorp.com.au, keyrings@...ux-nfs.org,
	linux-kernel@...r.kernel.org, dmitry.kasatkin@...il.com
Subject: Re: [PATCH 1/4] KEYS: handle error code encoded in pointer

Dmitry Kasatkin <d.kasatkin@...sung.com> wrote:

> If hexlen is odd then function returns an error.
> Use IS_ERR to check for error, otherwise invalid pointer
> is used and kernel gives oops:
> 
> [  132.816522] BUG: unable to handle kernel paging request at
> ffffffffffffffea
> [  132.819902] IP: [<ffffffff812bfc20>] asymmetric_key_id_same+0x14/0x36
> [  132.820302] PGD 1a12067 PUD 1a14067 PMD 0
> [  132.820302] Oops: 0000 [#1] SMP
> [  132.820302] Modules linked in: bridge(E) stp(E) llc(E) evdev(E)
> serio_raw(E) i2c_piix4(E) button(E) fuse(E)
> [  132.820302] CPU: 0 PID: 2993 Comm: cat Tainted: G            E
> 3.16.0-kds+ #2847
> [  132.820302] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
> [  132.820302] task: ffff88004249a430 ti: ffff880056640000 task.ti:
> ffff880056640000
> [  132.820302] RIP: 0010:[<ffffffff812bfc20>]  [<ffffffff812bfc20>]
> asymmetric_key_id_same+0x14/0x36
> [  132.820302] RSP: 0018:ffff880056643930  EFLAGS: 00010246
> [  132.820302] RAX: 0000000000000000 RBX: ffffffffffffffea RCX:
> ffff880056643ae0
> [  132.820302] RDX: 000000000000005e RSI: ffffffffffffffea RDI:
> ffff88005bac9300
> [  132.820302] RBP: ffff880056643948 R08: 0000000000000003 R09:
> 00000007504aa01a
> [  132.820302] R10: 0000000000000000 R11: 0000000000000000 R12:
> ffff88005d68ca40
> [  132.820302] R13: 0000000000000101 R14: 0000000000000000 R15:
> ffff88005bac5280
> [  132.820302] FS:  00007f67a153c740(0000) GS:ffff88005da00000(0000)
> knlGS:0000000000000000
> [  132.820302] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [  132.820302] CR2: ffffffffffffffea CR3: 000000002e663000 CR4:
> 00000000000006f0
> [  132.820302] Stack:
> [  132.820302]  ffffffff812bfc66 ffff880056643ae0 ffff88005bac5280
> ffff880056643958
> [  132.820302]  ffffffff812bfc9d ffff880056643980 ffffffff812971d9
> ffff88005ce930c1
> [  132.820302]  ffff88005ce930c0 0000000000000000 ffff8800566439c8
> ffffffff812fb753
> [  132.820302] Call Trace:
> [  132.820302]  [<ffffffff812bfc66>] ? asymmetric_match_key_ids+0x24/0x42
> [  132.820302]  [<ffffffff812bfc9d>] asymmetric_key_cmp+0x19/0x1b
> [  132.820302]  [<ffffffff812971d9>] keyring_search_iterator+0x74/0xd7
> [  132.820302]  [<ffffffff812fb753>] assoc_array_subtree_iterate+0x67/0xd2
> [  132.820302]  [<ffffffff81297165>] ? key_default_cmp+0x20/0x20
> [  132.820302]  [<ffffffff812fbaa1>] assoc_array_iterate+0x19/0x1e
> [  132.820302]  [<ffffffff81297332>] search_nested_keyrings+0xf6/0x2b6
> [  132.820302]  [<ffffffff810728da>] ? sched_clock_cpu+0x91/0xa2
> [  132.820302]  [<ffffffff810860d2>] ? mark_held_locks+0x58/0x6e
> [  132.820302]  [<ffffffff810a137d>] ? current_kernel_time+0x77/0xb8
> [  132.820302]  [<ffffffff81297871>] keyring_search_aux+0xe1/0x14c
> [  132.820302]  [<ffffffff812977fc>] ? keyring_search_aux+0x6c/0x14c
> [  132.820302]  [<ffffffff8129796b>] keyring_search+0x8f/0xb6
> [  132.820302]  [<ffffffff812bfc84>] ? asymmetric_match_key_ids+0x42/0x42
> [  132.820302]  [<ffffffff81297165>] ? key_default_cmp+0x20/0x20
> [  132.820302]  [<ffffffff812ab9e3>] asymmetric_verify+0xa4/0x214
> [  132.820302]  [<ffffffff812ab90e>] integrity_digsig_verify+0xb1/0xe2
> [  132.820302]  [<ffffffff812abe41>] ? evm_verifyxattr+0x6a/0x7a
> [  132.820302]  [<ffffffff812b0390>] ima_appraise_measurement+0x160/0x370
> [  132.820302]  [<ffffffff81161db2>] ? d_absolute_path+0x5b/0x7a
> [  132.820302]  [<ffffffff812ada30>] process_measurement+0x322/0x404
> 
> Reported-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
> Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>

Applied.
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