Bluetooth: btmtk: Fix kernel crash when processing coredump
Subsystems (2)
PATCH v5 1/1 Bluetooth: btmtk: Fix kernel crash when processing coredump
There may be a potential kernel crash risk if 'skb->len - MTK_COREDUMP_END_LEN' value is less than 0 when doing memcmp in btmtk_process_coredump(). Check the value is valid before doing memcmp.
[ 215.021695] Unable to handle kernel paging request at virtual address ffffff939fffd3c5 [ 215.021781] Mem abort info: [ 215.021805] ESR = 0x96000005 [ 215.021833] EC = 0x25: DABT (current EL), IL = 32 bits [ 215.021861] SET = 0, FnV = 0 [ 215.021875] EA = 0, S1PTW = 0 [ 215.021886] Data abort info: [ 215.021899] ISV = 0, ISS = 0x00000005 [ 215.021912] CM = 0, WnR = 0 [ 215.021929] swapper pgtable: 4k pages, 39-bit VAs, pgdp=00000000410de000 [ 215.021943] [ffffff939fffd3c5] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 [ 215.021979] Internal error: Oops: 96000005 [#1] PREEMPT SMP [ 215.022496] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.186 #3 (HASH:ad23 4) [ 215.022511] Hardware name: MediaTek Tomato board (DT) [ 215.022530] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO BTYPE=--) [ 215.022556] pc : __pi_memcmp+0xd0/0x1b8 [ 215.022579] lr : btmtk_process_coredump+0xb0/0x5f8 [btmtk] [ 215.022593] sp : ffffffc010003d40 [ 215.022607] x29: ffffffc010003d40 x28: 0000000000000006 [ 215.022633] x27: ffffffda696350c0 x26: 0000000000000002 [ 215.022659] x25: 00000000000003ff x24: ffffff9360cca804 [ 215.022685] x23: 0000000000000000 x22: ffffff9365638500 [ 215.022710] x21: ffffff9365638700 x20: 0000000000000000 [ 215.022736] x19: ffffff936002e000 x18: 0000000000000000 [ 215.022761] x17: 0000000000000180 x16: ffffffda6881b8b4 [ 215.022787] x15: 0000000000000001 x14: 0000000000002d00 [ 215.022812] x13: 0000000000060000 x12: 0000000000000181 [ 215.022837] x11: 0000000000000006 x10: fffffffffffffffd [ 215.022862] x9 : 0000000000000006 x8 : 0000000000000003 [ 215.022887] x7 : 0000000000000000 x6 : 0000000000000000 [ 215.022913] x5 : ffffff93656387b8 x4 : 0000000000000000 [ 215.022938] x3 : ffffffc010003c18 x2 : 0000000000000006 [ 215.022963] x1 : ffffffda09d4124a x0 : ffffff939fffd3c5 [ 215.022989] Call trace: [ 215.023012] __pi_memcmp+0xd0/0x1b8 [ 215.023053] btusb_recv_acl_mtk+0x64/0x90 [btusb (HASH:dc6b 5)] [ 215.023087] btusb_recv_bulk+0x118/0x170 [btusb (HASH:dc6b 5)] [ 215.023121] btusb_bulk_complete+0x8c/0x148 [btusb (HASH:dc6b 5)] [ 215.023144] __usb_hcd_giveback_urb+0xbc/0x148 [ 215.023164] usb_giveback_urb_bh+0xb4/0x190 [ 215.023184] tasklet_action_common+0x98/0x1a0 [ 215.023201] tasklet_action+0x2c/0x38 [ 215.023220] __do_softirq+0xe0/0x38c [ 215.023241] invoke_softirq+0x34/0x6c [ 215.023258] irq_exit+0x6c/0xb0 [ 215.023279] __handle_domain_irq+0x98/0xd4 [ 215.023296] gic_handle_irq+0x5c/0x11c [ 215.023313] el1_irq+0xd0/0x180 [ 215.023332] cpuidle_enter_state+0xac/0x338 [ 215.023349] cpuidle_enter+0x40/0x70 [ 215.023366] do_idle+0x150/0x278 [ 215.023384] cpu_startup_entry+0x2c/0x58 [ 215.023401] rest_init+0xdc/0xec [ 215.023419] arch_call_rest_init+0x18/0x24 [ 215.023435] start_kernel+0x334/0x400 [ 215.023460] Code: 91002129 eb09010a 9a89810b cb0b0042 (38401403) [ 215.023478] ---[ end trace 28668fd20c7a90cd ]
--- drivers/bluetooth/btmtk.c | 12 ++++++------ drivers/bluetooth/btmtk.h | 1 + 2 files changed, 7 insertions(+), 6 deletions(-)
drivers/bluetooth/btmtk.c +6 -6
@@ -395,12 +395,12 @@ int btmtk_process_coredump(struct hci_dev *hdev, struct sk_buff *skb)/* Mediatek coredump data would be more than MTK_COREDUMP_NUM */ if (data->cd_info.cnt >MTK_COREDUMP_NUM && - skb->len >sizeof (MTK_COREDUMP_END ) && - !memcmp ((char *)&skb->data[skb->len -sizeof (MTK_COREDUMP_END )], -MTK_COREDUMP_END ,sizeof (MTK_COREDUMP_END ) -1 )) { -bt_dev_info (hdev,"Mediatek coredump end" ); -hci_devcd_complete (hdev); - } + skb->len >MTK_COREDUMP_END_LEN ) +if (!memcmp ((char *)&skb->data[skb->len -MTK_COREDUMP_END_LEN ], +MTK_COREDUMP_END ,MTK_COREDUMP_END_LEN -1 )) { +bt_dev_info (hdev,"Mediatek coredump end" ); +hci_devcd_complete (hdev); + }break ; }
drivers/bluetooth/btmtk.h +1 -0
@@ -24,6 +24,7 @@#define MTK_COREDUMP_SIZE (1024 * 1000)#define MTK_COREDUMP_END "coredump end" +#define MTK_COREDUMP_END_LEN (sizeof(MTK_COREDUMP_END))#define MTK_COREDUMP_NUM 255enum {
Signature · 1 line
2.18.0
This is automated email and please do not reply to this email!
Dear submitter,
Thank you for submitting the patches to the linux bluetooth mailing list. This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=765133
---Test result---
Test Summary:
CheckPatch FAIL 1.13 seconds GitLint FAIL 0.56 seconds SubjectPrefix PASS 0.12 seconds BuildKernel PASS 32.89 seconds CheckAllWarning PASS 36.39 seconds CheckSparse PASS 41.52 seconds CheckSmatch PASS 111.85 seconds BuildKernel32 PASS 31.90 seconds TestRunnerSetup PASS 487.08 seconds TestRunner_l2cap-tester PASS 23.09 seconds TestRunner_iso-tester PASS 42.28 seconds TestRunner_bnep-tester PASS 10.73 seconds TestRunner_mgmt-tester PASS 216.56 seconds TestRunner_rfcomm-tester PASS 16.11 seconds TestRunner_sco-tester PASS 17.09 seconds TestRunner_ioctl-tester PASS 18.18 seconds TestRunner_mesh-tester PASS 13.56 seconds TestRunner_smp-tester PASS 14.35 seconds TestRunner_userchan-tester PASS 11.25 seconds IncrementalBuild PASS 30.21 seconds
Details
##############################
Test: CheckPatch - FAIL
Desc: Run checkpatch.pl script
Output:
[v5] Bluetooth: btmtk: Fix kernel crash when processing coredump
WARNING: Possible unwrapped commit description (prefer a maximum 75 chars per line) #77:
There may be a potential kernel crash risk if 'skb->len - MTK_COREDUMP_END_LEN'
total: 0 errors, 1 warnings, 25 lines checked
NOTE: For some of the reported defects, checkpatch may be able to
mechanically convert to the typical style using --fix or --fix-inplace.
/github/workspace/src/src/13311347.patch has style problems, please review.
NOTE: Ignored message types: UNKNOWN_COMMIT_ID
NOTE: If any of the errors are false positives, please report
them to the maintainer, see CHECKPATCH in MAINTAINERS.
##############################
Test: GitLint - FAIL
Desc: Run gitlint
Output:
[v5] Bluetooth: btmtk: Fix kernel crash when processing coredump
WARNING: I3 - ignore-body-lines: gitlint will be switching from using Python regex 'match' (match beginning) to 'search' (match anywhere) semantics. Please review your ignore-body-lines.regex option accordingly. To remove this warning, set general.regex-style-search=True. More details: https://jorisroovers.github.io/gitlint/configuration/#regex-style-search
7: B1 Line exceeds max length (89>80): "[ 215.021695] Unable to handle kernel paging request at virtual address ffffff939fffd3c5"
17: B1 Line exceeds max length (98>80): "[ 215.021943] [ffffff939fffd3c5] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000"
19: B1 Line exceeds max length (82>80): "[ 215.022496] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.186 #3 (HASH:ad23 4)"
---
Regards,
Linux Bluetooth