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LoongArch: Enable exception fixup for specific ADE subcode

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[ Upstream commit 9bdc1ab5e4 ]

This patch allows the LoongArch BPF JIT to handle recoverable memory
access errors generated by BPF_PROBE_MEM* instructions.

When a BPF program performs memory access operations, the instructions
it executes may trigger ADEM exceptions. The kernel’s built-in BPF
exception table mechanism (EX_TYPE_BPF) will generate corresponding
exception fixup entries in the JIT compilation phase; however, the
architecture-specific trap handling function needs to proactively call
the common fixup routine to achieve exception recovery.

do_ade(): fix EX_TYPE_BPF memory access exceptions for BPF programs,
ensure safe execution.

Relevant test cases: illegal address access tests in module_attach and
subprogs_extable of selftests/bpf.

Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chenghao Duan
2026-02-11 13:39:10 +01:00
committed by Greg Kroah-Hartman
parent 2456fde2b1
commit 73ede654d9
1 changed files with 5 additions and 0 deletions
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arch/loongarch/kernel/traps.c
+5
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@@ -508,10 +508,15 @@ out:
asmlinkage void noinstr do_ade(struct pt_regs *regs)
{
irqentry_state_t state = irqentry_enter(regs);
unsigned int esubcode = FIELD_GET(CSR_ESTAT_ESUBCODE, regs->csr_estat);
if ((esubcode == EXSUBCODE_ADEM) && fixup_exception(regs))
goto out;
die_if_kernel("Kernel ade access", regs);
force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)regs->csr_badvaddr);
out:
irqentry_exit(regs, state);
}