[PATCH 4.14 298/323] RDMA/i40iw: Avoid panic when reading back the IRQ affinity hint
From: Greg Kroah-Hartman
Date: Thu May 20 2021 - 06:55:25 EST
From: Andrew Boyer <andrew.boyer@xxxxxxxx>
commit 43731753c4b7d832775cf6b2301dd0447a5a1851 upstream.
The current code sets an affinity hint with a cpumask_t stored on the
stack. This value can then be accessed through /proc/irq/*/affinity_hint/,
causing a segfault or returning corrupt data.
Move the cpumask_t into struct i40iw_msix_vector so it is available later.
Backtrace:
BUG: unable to handle kernel paging request at ffffb16e600e7c90
IP: irq_affinity_hint_proc_show+0x60/0xf0
PGD 17c0c6d067
PUD 17c0c6e067
PMD 15d4a0e067
PTE 0
Oops: 0000 [#1] SMP
Modules linked in: ...
CPU: 3 PID: 172543 Comm: grep Tainted: G OE ... #1
Hardware name: ...
task: ffff9a5caee08000 task.stack: ffffb16e659d8000
RIP: 0010:irq_affinity_hint_proc_show+0x60/0xf0
RSP: 0018:ffffb16e659dbd20 EFLAGS: 00010086
RAX: 0000000000000246 RBX: ffffb16e659dbd20 RCX: 0000000000000000
RDX: ffffb16e600e7c90 RSI: 0000000000000003 RDI: 0000000000000046
RBP: ffffb16e659dbd88 R08: 0000000000000038 R09: 0000000000000001
R10: 0000000070803079 R11: 0000000000000000 R12: ffff9a59d1d97a00
R13: ffff9a5da47a6cd8 R14: ffff9a5da47a6c00 R15: ffff9a59d1d97a00
FS: 00007f946c31d740(0000) GS:ffff9a5dc1800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffb16e600e7c90 CR3: 00000016a4339000 CR4: 00000000007406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
seq_read+0x12d/0x430
? sched_clock_cpu+0x11/0xb0
proc_reg_read+0x48/0x70
__vfs_read+0x37/0x140
? security_file_permission+0xa0/0xc0
vfs_read+0x96/0x140
SyS_read+0x58/0xc0
do_syscall_64+0x5a/0x190
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x7f946bbc97e0
RSP: 002b:00007ffdd0c4ae08 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000000000096b000 RCX: 00007f946bbc97e0
RDX: 000000000096b000 RSI: 00007f946a2f0000 RDI: 0000000000000004
RBP: 0000000000001000 R08: 00007f946a2ef011 R09: 000000000000000a
R10: 0000000000001000 R11: 0000000000000246 R12: 00007f946a2f0000
R13: 0000000000000004 R14: 0000000000000000 R15: 00007f946a2f0000
Code: b9 08 00 00 00 49 89 c6 48 89 df 31 c0 4d 8d ae d8 00 00 00 f3 48 ab 4c 89 ef e8 6c 9a 56 00 49 8b 96 30 01 00 00 48 85 d2 74 3f <48> 8b 0a 48 89 4d 98 48 8b 4a 08 48 89 4d a0 48 8b 4a 10 48 89
RIP: irq_affinity_hint_proc_show+0x60/0xf0 RSP: ffffb16e659dbd20
CR2: ffffb16e600e7c90
Fixes: 8e06af711bf2 ("i40iw: add main, hdr, status")
Signed-off-by: Andrew Boyer <andrew.boyer@xxxxxxxx>
Reviewed-by: Shiraz Saleem <shiraz.saleem@xxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
CC: Edwin Peer <edwin.peer@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/i40iw/i40iw.h | 1 +
drivers/infiniband/hw/i40iw/i40iw_main.c | 7 +++----
2 files changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/infiniband/hw/i40iw/i40iw.h
+++ b/drivers/infiniband/hw/i40iw/i40iw.h
@@ -210,6 +210,7 @@ struct i40iw_msix_vector {
u32 irq;
u32 cpu_affinity;
u32 ceq_id;
+ cpumask_t mask;
};
struct l2params_work {
--- a/drivers/infiniband/hw/i40iw/i40iw_main.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_main.c
@@ -676,7 +676,6 @@ static enum i40iw_status_code i40iw_conf
struct i40iw_msix_vector *msix_vec)
{
enum i40iw_status_code status;
- cpumask_t mask;
if (iwdev->msix_shared && !ceq_id) {
tasklet_init(&iwdev->dpc_tasklet, i40iw_dpc, (unsigned long)iwdev);
@@ -686,9 +685,9 @@ static enum i40iw_status_code i40iw_conf
status = request_irq(msix_vec->irq, i40iw_ceq_handler, 0, "CEQ", iwceq);
}
- cpumask_clear(&mask);
- cpumask_set_cpu(msix_vec->cpu_affinity, &mask);
- irq_set_affinity_hint(msix_vec->irq, &mask);
+ cpumask_clear(&msix_vec->mask);
+ cpumask_set_cpu(msix_vec->cpu_affinity, &msix_vec->mask);
+ irq_set_affinity_hint(msix_vec->irq, &msix_vec->mask);
if (status) {
i40iw_pr_err("ceq irq config fail\n");