- Description
- In the Linux kernel, the following vulnerability has been resolved:
riscv: fix oops caused by irqsoff latency tracer
The trace_hardirqs_{on,off}() require the caller to setup frame pointer
properly. This because these two functions use macro 'CALLER_ADDR1' (aka.
__builtin_return_address(1)) to acquire caller info. If the $fp is used
for other purpose, the code generated this macro (as below) could trigger
memory access fault.
0xffffffff8011510e <+80>: ld a1,-16(s0)
0xffffffff80115112 <+84>: ld s2,-8(a1) # <-- paging fault here
The oops message during booting if compiled with 'irqoff' tracer enabled:
[ 0.039615][ T0] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000f8
[ 0.041925][ T0] Oops [#1]
[ 0.042063][ T0] Modules linked in:
[ 0.042864][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.17.0-rc1-00233-g9a20c48d1ed2 #29
[ 0.043568][ T0] Hardware name: riscv-virtio,qemu (DT)
[ 0.044343][ T0] epc : trace_hardirqs_on+0x56/0xe2
[ 0.044601][ T0] ra : restore_all+0x12/0x6e
[ 0.044721][ T0] epc : ffffffff80126a5c ra : ffffffff80003b94 sp : ffffffff81403db0
[ 0.044801][ T0] gp : ffffffff8163acd8 tp : ffffffff81414880 t0 : 0000000000000020
[ 0.044882][ T0] t1 : 0098968000000000 t2 : 0000000000000000 s0 : ffffffff81403de0
[ 0.044967][ T0] s1 : 0000000000000000 a0 : 0000000000000001 a1 : 0000000000000100
[ 0.045046][ T0] a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
[ 0.045124][ T0] a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000054494d45
[ 0.045210][ T0] s2 : ffffffff80003b94 s3 : ffffffff81a8f1b0 s4 : ffffffff80e27b50
[ 0.045289][ T0] s5 : ffffffff81414880 s6 : ffffffff8160fa00 s7 : 00000000800120e8
[ 0.045389][ T0] s8 : 0000000080013100 s9 : 000000000000007f s10: 0000000000000000
[ 0.045474][ T0] s11: 0000000000000000 t3 : 7fffffffffffffff t4 : 0000000000000000
[ 0.045548][ T0] t5 : 0000000000000000 t6 : ffffffff814aa368
[ 0.045620][ T0] status: 0000000200000100 badaddr: 00000000000000f8 cause: 000000000000000d
[ 0.046402][ T0] [<ffffffff80003b94>] restore_all+0x12/0x6e
This because the $fp(aka. $s0) register is not used as frame pointer in the
assembly entry code.
resume_kernel:
REG_L s0, TASK_TI_PREEMPT_COUNT(tp)
bnez s0, restore_all
REG_L s0, TASK_TI_FLAGS(tp)
andi s0, s0, _TIF_NEED_RESCHED
beqz s0, restore_all
call preempt_schedule_irq
j restore_all
To fix above issue, here we add one extra level wrapper for function
trace_hardirqs_{on,off}() so they can be safely called by low level entry
code.
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- NVD status
- Analyzed
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7144C576-97DF-4D5F-B88F-F55AF9826BF5",
"versionEndExcluding": "5.10.103",
"versionStartIncluding": "5.9"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9AB342AE-A62E-4947-A6EA-511453062B2B",
"versionEndExcluding": "5.15.26",
"versionStartIncluding": "5.11"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C76BAB21-7F23-4AD8-A25F-CA7B262A2698",
"versionEndExcluding": "5.16.12",
"versionStartIncluding": "5.16"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7BD5F8D9-54FA-4CB0-B4F0-CB0471FDDB2D"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E6E34B23-78B4-4516-9BD8-61B33F4AC49A"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C030FA3D-03F4-4FB9-9DBF-D08E5CAC51AA"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B2D2677C-5389-4AE9-869D-0F881E80D923"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.17:rc5:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "EFA3917C-C322-4D92-912D-ECE45B2E7416"
}
],
"operator": "OR"
}
]
}
]