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riscv:uprobe fix SR_SPIE set/clear handling

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In riscv the process of uprobe going to clear spie before exec
the origin insn,and set spie after that.But When access the page
which origin insn has been placed a page fault may happen and
irq was disabled in arch_uprobe_pre_xol function,It cause a WARN
as follows.
There is no need to clear/set spie in arch_uprobe_pre/post/abort_xol.
We can just remove it.

[   31.684157] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1488
[   31.684677] in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 76, name: work
[   31.684929] preempt_count: 0, expected: 0
[   31.685969] CPU: 2 PID: 76 Comm: work Tainted: G
[   31.686542] Hardware name: riscv-virtio,qemu (DT)
[   31.686797] Call Trace:
[   31.687053] [<ffffffff80006442>] dump_backtrace+0x30/0x38
[   31.687699] [<ffffffff80812118>] show_stack+0x40/0x4c
[   31.688141] [<ffffffff8081817a>] dump_stack_lvl+0x44/0x5c
[   31.688396] [<ffffffff808181aa>] dump_stack+0x18/0x20
[   31.688653] [<ffffffff8003e454>] __might_resched+0x114/0x122
[   31.688948] [<ffffffff8003e4b2>] __might_sleep+0x50/0x7a
[   31.689435] [<ffffffff80822676>] down_read+0x30/0x130
[   31.689728] [<ffffffff8000b650>] do_page_fault+0x166/x446
[   31.689997] [<ffffffff80003c0c>] ret_from_exception+0x0/0xc

Fixes: 74784081aa ("riscv: Add uprobes supported")
Signed-off-by: Yipeng Zou <zouyipeng@huawei.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220721065820.245755-1-zouyipeng@huawei.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Yipeng Zou 2022-07-21 14:58:20 +08:00 committed by Palmer Dabbelt
parent b60cf8e59e
commit 3dbe582940
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1 changed files with 0 additions and 6 deletions
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6
arch/riscv/kernel/probes/uprobes.c
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@ -59,8 +59,6 @@ int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
instruction_pointer_set(regs, utask->xol_vaddr);
regs->status &= ~SR_SPIE;
return 0;
}
@ -72,8 +70,6 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
regs->status |= SR_SPIE;
return 0;
}
@ -111,8 +107,6 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
* address.
*/
instruction_pointer_set(regs, utask->vaddr);
regs->status &= ~SR_SPIE;
}
bool arch_uretprobe_is_alive(struct return_instance *ret, enum rp_check ctx,