diff options
| author | Josh Poimboeuf <[email protected]> | 2017-11-07 20:19:34 -0600 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2017-11-08 10:21:49 +0100 |
| commit | 881125bfe65bb772f34f4fcb04a35dfe117e186a (patch) | |
| tree | 4a8c871fc19400c6ac7500c090c8783754a8f23b /drivers/fpga/fpga-region.c | |
| parent | 76ce7cfe35ef58f34e6ba85327afb5fbf6c3ff9b (diff) | |
x86/unwind: Disable KASAN checking in the ORC unwinder
Fengguang reported a KASAN warning:
Kprobe smoke test: started
==================================================================
BUG: KASAN: stack-out-of-bounds in deref_stack_reg+0xb5/0x11a
Read of size 8 at addr ffff8800001c7cd8 by task swapper/1
CPU: 0 PID: 1 Comm: swapper Not tainted 4.14.0-rc8 #26
Call Trace:
<#DB>
...
save_trace+0xd9/0x1d3
mark_lock+0x5f7/0xdc3
__lock_acquire+0x6b4/0x38ef
lock_acquire+0x1a1/0x2aa
_raw_spin_lock_irqsave+0x46/0x55
kretprobe_table_lock+0x1a/0x42
pre_handler_kretprobe+0x3f5/0x521
kprobe_int3_handler+0x19c/0x25f
do_int3+0x61/0x142
int3+0x30/0x60
[...]
The ORC unwinder got confused by some kprobes changes, which isn't
surprising since the runtime code no longer matches vmlinux and the
stack was modified for kretprobes.
Until we have a way for generated code to register changes with the
unwinder, these types of warnings are inevitable. So just disable KASAN
checks for stack accesses in the ORC unwinder.
Reported-by: Fengguang Wu <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thiago Jung Bauermann <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/20171108021934.zbl6unh5hpugybc5@treble
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'drivers/fpga/fpga-region.c')
0 files changed, 0 insertions, 0 deletions