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csky: uprobes: Restore thread.trap_no

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thread.trap_no is saved in arch_uprobe_pre_xol(), it should be restored
in arch_uprobe_{post,abort}_xol() accordingly, otherwise the save operation
is meaningless, this change is similar with x86 and powerpc.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@kernel.org>
This commit is contained in:
Tiezhu Yang 2023-04-23 09:39:47 +08:00 committed by Guo Ren
parent ac9a78681b
commit dd64621a2a
1 changed files with 3 additions and 0 deletions
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3
arch/csky/kernel/probes/uprobes.c
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@ -64,6 +64,7 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
struct uprobe_task *utask = current->utask;
WARN_ON_ONCE(current->thread.trap_no != UPROBE_TRAP_NR);
current->thread.trap_no = utask->autask.saved_trap_no;
instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
@ -101,6 +102,8 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
struct uprobe_task *utask = current->utask;
current->thread.trap_no = utask->autask.saved_trap_no;
/*
* Task has received a fatal signal, so reset back to probed
* address.