linux-kernel - [PATCH] tee: fix kasan check slab-out-of-bounds error.

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Message-ID: <20190912083649.4688-1-chunguo.feng@amlogic.com>
Date:   Thu, 12 Sep 2019 16:36:49 +0800
From:   chunguo feng <chunguo.feng@...ogic.com>
To:     <jens.wiklander@...aro.org>
CC:     <linux-kernel@...r.kernel.org>,
        fengchunguo <chunguo.feng@...ogic.com>
Subject: [PATCH] tee: fix kasan check slab-out-of-bounds error.

From: fengchunguo <chunguo.feng@...ogic.com>

Physical address should be set one shifting, but not cover shm struct data.
If offs was set 0, it cause KASAN error.

Log:
[22.345259@0] BUG: KASAN: slab-out-of-bounds in optee_handle_rpc+0x644/0x858
[22.352221@0] Read of size 4 at addr ffffffc0445485dc by task tee_preload_fw/2505
[22.361280@0] CPU: 0 PID: 2505 Comm: tee_preload_fw Tainted: G    B   W  O      
		4.19.53-01721-g11b1db7-dirty #417
[22.376617@0] Call trace:
[22.379220@0]  dump_backtrace+0x0/0x1b4
[22.383003@0]  show_stack+0x20/0x28
[22.386459@0]  dump_stack+0x8c/0xb4
[22.389909@0]  print_address_description+0x10c/0x274
[22.394819@0]  kasan_report+0x224/0x370
[22.398616@0]  __asan_load4+0x6c/0x84
[22.402238@0]  optee_handle_rpc+0x644/0x858
[22.406375@0]  optee_do_call_with_arg+0x148/0x160
[22.411033@0]  optee_open_session+0x1b0/0x340
[22.415352@0]  tee_ioctl_open_session+0x28c/0x784
[22.420006@0]  tee_ioctl+0x210/0x800
[22.423546@0]  do_vfs_ioctl+0x104/0xe7c
[22.427337@0]  __arm64_sys_ioctl+0xac/0xc0
[22.431393@0]  invoke_syscall+0xd4/0xf4
[22.435187@0]  el0_svc_common+0x88/0x128
[22.439066@0]  el0_svc_handler+0x40/0x84
[22.442947@0]  el0_svc+0x8/0xc
[22.445962@0]
[22.447602@0] Allocated by task 2508:
[22.451231@0]  kasan_kmalloc.part.5+0x50/0x124
[22.455627@0]  kasan_kmalloc+0xc4/0xe4
[22.459334@0]  kmem_cache_alloc_trace+0x154/0x2bc
[22.463994@0]  tee_shm_alloc+0xa0/0x340
[22.467788@0]  tee_ioctl+0x39c/0x800
[22.471324@0]  do_vfs_ioctl+0x104/0xe7c
[22.475119@0]  __arm64_sys_ioctl+0xac/0xc0
[22.479172@0]  invoke_syscall+0xd4/0xf4
[22.482967@0]  el0_svc_common+0x88/0x128
[22.486849@0]  el0_svc_handler+0x40/0x84
[22.490728@0]  el0_svc+0x8/0xc
[22.493743@0]
[22.495384@0] Freed by task 0:
[22.498408@0]  __kasan_slab_free+0x11c/0x21c
[22.502631@0]  kasan_slab_free+0x10/0x18
[22.506511@0]  kfree+0x8c/0x284
[22.509625@0]  selinux_cred_free+0x48/0x64
[22.513672@0]  security_cred_free+0x48/0x64
[22.517817@0]  put_cred_rcu+0x3c/0x108
[22.521523@0]  rcu_process_callbacks+0x308/0x7ac
[22.526092@0]  __do_softirq+0x1c8/0x5c8
[22.529882@0]
[22.531527@0] The buggy address belongs to the object at ffffffc044548580
[22.531527@0]  which belongs to the cache kmalloc-128 of size 128
[22.544291@0] The buggy address is located 92 bytes inside of
[22.544291@0]  128-byte region [ffffffc044548580, ffffffc044548600)
[22.556190@0] The buggy address belongs to the page:
[22.561110@0] page:ffffffbf01115200 count:1 mapcount:0 mapping:ffffffc04540c400 index:0x0 compound_mapcount: 0
[22.571029@0] flags: 0x20094e4b00010200(slab|head)
[22.575780@0] raw: 20094e4b00010200 ffffffbf01113408 ffffffbf01119508 ffffffc04540c400
[22.583622@0] raw: 0000000000000000 0000000000190019 00000001ffffffff 0000000000000000
[22.591466@0] page dumped because: kasan: bad access detected
[22.597157@0]
[22.598797@0] Memory state around the buggy address:
[22.603719@0]  ffffffc044548480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[22.611048@0]  ffffffc044548500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[22.618379@0] >ffffffc044548580: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
[22.625707@0]                                                     ^
[22.631920@0]  ffffffc044548600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[22.639251@0]  ffffffc044548680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[22.646580@0] ==================================================================

Test:
1. Set offs range,then test tee_preload successfully.
/ # tee_preload_fw 
use default tee_preload_fw pathfw_path=/lib/firmware/video/video_ucode.bin
tee preload video fw ok
/ # echo $?
0

Signed-off-by: fengchunguo <chunguo.feng@...ogic.com>
---
 drivers/tee/tee_shm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
index 0b9ab1d0dd45..585361cd8dd9 100644
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -461,7 +461,7 @@ int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
 	if (offs >= shm->size)
 		return -EINVAL;
 	if (pa)
-		*pa = shm->paddr + offs;
+		*pa = shm->paddr + shm->size;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(tee_shm_get_pa);
-- 
2.22.0