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riscv: uprobes: Restore thread.bad_cause 

[ Upstream commit 58b1294dd1 ]

thread.bad_cause 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>
Fixes: 74784081aa ("riscv: Add uprobes supported")
Link: https://lore.kernel.org/r/1682214146-3756-1-git-send-email-yangtiezhu@loongson.cn
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tiezhu Yang 2023-04-23 09:42:26 +08:00 committed by Greg Kroah-Hartman
parent d25166e1e9
commit 526129937c
1 changed files with 2 additions and 0 deletions
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arch/riscv/kernel/probes/uprobes.c
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@ -67,6 +67,7 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
struct uprobe_task *utask = current->utask;
WARN_ON_ONCE(current->thread.bad_cause != UPROBE_TRAP_NR);
current->thread.bad_cause = utask->autask.saved_cause;
instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
@ -102,6 +103,7 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
struct uprobe_task *utask = current->utask;
current->thread.bad_cause = utask->autask.saved_cause;
/*
* Task has received a fatal signal, so reset back to probbed
* address.