On 2025/9/8 9:24, Hengqi Chen wrote:
The ns_bpf_qdisc selftest triggers a kernel panic: Unable to handle kernel paging request at virtual address ffffffffa38dbf58 Current test_progs pgtable: 4K pagesize, 57-bit VAs, pgdp=0x00000001109cc000 [ffffffffa38dbf58] pgd=000000011fffd801, p4d=000000011fffd401, pud=000000011fffd001, pmd=0000000000000000 Oops [#1] Modules linked in: bpf_testmod(OE) xt_conntrack nls_iso8859_1 dm_mod drm drm_panel_orientation_quirks configfs backlight btrfs blake2b_generic xor lzo_compress zlib_deflate raid6_pq efivarfs [last unloaded: bpf_testmod(OE)] CPU: 1 UID: 0 PID: 23584 Comm: test_progs Tainted: G W OE 6.17.0-rc1-g2465bb83e0b4 #1 NONE Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2024.01+dfsg-1ubuntu5.1 01/01/2024 epc : __qdisc_run+0x82/0x6f0 ra : __qdisc_run+0x6e/0x6f0 epc : ffffffff80bd5c7a ra : ffffffff80bd5c66 sp : ff2000000eecb550 gp : ffffffff82472098 tp : ff60000096895940 t0 : ffffffff8001f180 t1 : ffffffff801e1664 t2 : 0000000000000000 s0 : ff2000000eecb5d0 s1 : ff60000093a6a600 a0 : ffffffffa38dbee8 a1 : 0000000000000001 a2 : ff2000000eecb510 a3 : 0000000000000001 a4 : 0000000000000000 a5 : 0000000000000010 a6 : 0000000000000000 a7 : 0000000000735049 s2 : ffffffffa38dbee8 s3 : 0000000000000040 s4 : ff6000008bcda000 s5 : 0000000000000008 s6 : ff60000093a6a680 s7 : ff60000093a6a6f0 s8 : ff60000093a6a6ac s9 : ff60000093140000 s10: 0000000000000000 s11: ff2000000eecb9d0 t3 : 0000000000000000 t4 : 0000000000ff0000 t5 : 0000000000000000 t6 : ff60000093a6a8b6 status: 0000000200000120 badaddr: ffffffffa38dbf58 cause: 000000000000000d [<ffffffff80bd5c7a>] __qdisc_run+0x82/0x6f0 [<ffffffff80b6fe58>] __dev_queue_xmit+0x4c0/0x1128 [<ffffffff80b80ae0>] neigh_resolve_output+0xd0/0x170 [<ffffffff80d2daf6>] ip6_finish_output2+0x226/0x6c8 [<ffffffff80d31254>] ip6_finish_output+0x10c/0x2a0 [<ffffffff80d31446>] ip6_output+0x5e/0x178 [<ffffffff80d2e232>] ip6_xmit+0x29a/0x608 [<ffffffff80d6f4c6>] inet6_csk_xmit+0xe6/0x140 [<ffffffff80c985e4>] __tcp_transmit_skb+0x45c/0xaa8 [<ffffffff80c995fe>] tcp_connect+0x9ce/0xd10 [<ffffffff80d66524>] tcp_v6_connect+0x4ac/0x5e8 [<ffffffff80cc19b8>] __inet_stream_connect+0xd8/0x318 [<ffffffff80cc1c36>] inet_stream_connect+0x3e/0x68 [<ffffffff80b42b20>] __sys_connect_file+0x50/0x88 [<ffffffff80b42bee>] __sys_connect+0x96/0xc8 [<ffffffff80b42c40>] __riscv_sys_connect+0x20/0x30 [<ffffffff80e5bcae>] do_trap_ecall_u+0x256/0x378 [<ffffffff80e69af2>] handle_exception+0x14a/0x156 Code: 892a 0363 1205 489c 8bc1 c7e5 2d03 084a 2703 080a (2783) 0709 ---[ end trace 0000000000000000 ]--- The bpf_fifo_dequeue prog returns a skb which is a pointer. The pointer is treated as a 32bit value and sign extend to 64bit in epilogue. This behavior is right for most bpf prog types but wrong for struct ops which requires RISC-V ABI. So let's sign extend struct ops return values according to the function model and RISC-V ABI([0]). [0]: https://riscv.org/wp-content/uploads/2024/12/riscv-calling.pdf Fixes: 25ad10658dc1 ("riscv, bpf: Adapt bpf trampoline to optimized riscv ftrace framework") Signed-off-by: Hengqi Chen <hengqi.chen@xxxxxxxxx> --- arch/riscv/net/bpf_jit_comp64.c | 42 ++++++++++++++++++++++++++++++++- 1 file changed, 41 insertions(+), 1 deletion(-) diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c index 397968d6ee09..a860be52dc49 100644 --- a/arch/riscv/net/bpf_jit_comp64.c +++ b/arch/riscv/net/bpf_jit_comp64.c @@ -711,6 +711,39 @@ static int emit_atomic_rmw(u8 rd, u8 rs, const struct bpf_insn *insn, return 0; }+/*+ * Sign-extend the register if necessary + */ +static int sign_extend(u8 rd, u8 rs, u8 sz, bool sign, struct rv_jit_context *ctx) +{ + if (!sign && (sz == 1 || sz == 2)) { + if (rd != rs) + emit_mv(rd, rs, ctx); + return 0; + } + + switch (sz) { + case 1: + emit_sextb(rd, rs, ctx); + break; + case 2: + emit_sexth(rd, rs, ctx); + break; + case 4: + emit_sextw(rd, rs, ctx); + break; + case 8: + if (rd != rs) + emit_mv(rd, rs, ctx); + break; + default: + pr_err("bpf-jit: invalid size %d for sign_extend\n", sz); + return -EINVAL; + } + + return 0; +} + #define BPF_FIXUP_OFFSET_MASK GENMASK(26, 0) #define BPF_FIXUP_REG_MASK GENMASK(31, 27) #define REG_DONT_CLEAR_MARKER 0 /* RV_REG_ZERO unused in pt_regmap */ @@ -1175,8 +1208,15 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, restore_args(min_t(int, nr_arg_slots, RV_MAX_REG_ARGS), args_off, ctx);if (save_ret) {- emit_ld(RV_REG_A0, -retval_off, RV_REG_FP, ctx); emit_ld(regmap[BPF_REG_0], -(retval_off - 8), RV_REG_FP, ctx); + if (is_struct_ops) { + ret = sign_extend(RV_REG_A0, regmap[BPF_REG_0], m->ret_size, + m->ret_flags & BTF_FMODEL_SIGNED_ARG, ctx); + if (ret) + goto out; + } else { + emit_ld(RV_REG_A0, -retval_off, RV_REG_FP, ctx); + } }emit_ld(RV_REG_S1, -sreg_off, RV_REG_FP, ctx);
Thanks Hengqi, feel free to add: Reviewed-by: Pu Lehui <pulehui@xxxxxxxxxx> Tested-by: Pu Lehui <pulehui@xxxxxxxxxx>
