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| author | Catalin Marinas <catalin.marinas@arm.com> | 2016-07-21 12:54:54 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-07-21 13:47:53 +0300 |
| commit | f7e35c5ba4322838ce84b23a2f1a6d6b7f0b57ec (patch) | |
| tree | 79442036f6553cc9efb40acec0eec18c5ab48161 /arch/arm64 | |
| parent | 3b7d14e9f3f1efd4c4348800e977fd1ce4ca660e (diff) | |
| download | linux-f7e35c5ba4322838ce84b23a2f1a6d6b7f0b57ec.tar.xz | |
arm64: kprobes: Add KASAN instrumentation around stack accesses
This patch disables KASAN around the memcpy from/to the kernel or IRQ
stacks to avoid warnings like below:
BUG: KASAN: stack-out-of-bounds in setjmp_pre_handler+0xe4/0x170 at addr ffff800935cbbbc0
Read of size 128 by task swapper/0/1
page:ffff7e0024d72ec0 count:0 mapcount:0 mapping: (null) index:0x0
flags: 0x1000000000000000()
page dumped because: kasan: bad access detected
CPU: 4 PID: 1 Comm: swapper/0 Not tainted 4.7.0-rc4+ #1
Hardware name: ARM Juno development board (r0) (DT)
Call trace:
[<ffff20000808ad88>] dump_backtrace+0x0/0x280
[<ffff20000808b01c>] show_stack+0x14/0x20
[<ffff200008563a64>] dump_stack+0xa4/0xc8
[<ffff20000824a1fc>] kasan_report_error+0x4fc/0x528
[<ffff20000824a5e8>] kasan_report+0x40/0x48
[<ffff20000824948c>] check_memory_region+0x144/0x1a0
[<ffff200008249814>] memcpy+0x34/0x68
[<ffff200008c3ee2c>] setjmp_pre_handler+0xe4/0x170
[<ffff200008c3ec5c>] kprobe_breakpoint_handler+0xec/0x1d8
[<ffff2000080853a4>] brk_handler+0x5c/0xa0
[<ffff2000080813f0>] do_debug_exception+0xa0/0x138
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kernel/probes/kprobes.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c index 973c15df5211..bf9768588288 100644 --- a/arch/arm64/kernel/probes/kprobes.c +++ b/arch/arm64/kernel/probes/kprobes.c @@ -16,6 +16,7 @@ * General Public License for more details. * */ +#include <linux/kasan.h> #include <linux/kernel.h> #include <linux/kprobes.h> #include <linux/module.h> @@ -498,8 +499,10 @@ int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs) * we also save and restore enough stack bytes to cover * the argument area. */ + kasan_disable_current(); memcpy(kcb->jprobes_stack, (void *)stack_ptr, min_stack_size(stack_ptr)); + kasan_enable_current(); instruction_pointer_set(regs, (unsigned long) jp->entry); preempt_disable(); @@ -551,8 +554,10 @@ int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs) } unpause_graph_tracing(); *regs = kcb->jprobe_saved_regs; + kasan_disable_current(); memcpy((void *)stack_addr, kcb->jprobes_stack, min_stack_size(stack_addr)); + kasan_enable_current(); preempt_enable_no_resched(); return 1; } |