riscv, bpf: Fix possible infinite tailcall when CONFIG_CFI_CLANG is enabled

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When CONFIG_CFI_CLANG is enabled, the number of prologue instructions
skipped by tailcall needs to include the kcfi instruction, otherwise the
TCC will be initialized every tailcall is called, which may result in
infinite tailcalls.

Fixes: e63985ecd2 ("bpf, riscv64/cfi: Support kCFI + BPF on riscv64")
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/r/20241008124544.171161-1-pulehui@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Pu Lehui 2024-10-08 12:45:44 +00:00 • committed by Alexei Starovoitov

parent 4538a38f65

commit 30a59cc797

1 changed files with 3 additions and 1 deletions

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arch/riscv/net/bpf_jit_comp64.c

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