From: Daniel Borkmann daniel@iogearbox.net
[ Upstream commit e6a18d36118bea3bf497c9df4d9988b6df120689 ]
Bryce reported that he saw the following with:
0: r6 = r1 1: r1 = 12 2: r0 = *(u16 *)skb[r1]
The xlated sequence was incorrectly clobbering r2 with pointer value of r6 ...
0: (bf) r6 = r1 1: (b7) r1 = 12 2: (bf) r1 = r6 3: (bf) r2 = r1 4: (85) call bpf_skb_load_helper_16_no_cache#7692160
... and hence call to the load helper never succeeded given the offset was too high. Fix it by reordering the load of r6 to r1.
Other than that the insn has similar calling convention than BPF helpers, that is, r0 - r5 are scratch regs, so nothing else affected after the insn.
Fixes: e0cea7ce988c ("bpf: implement ld_abs/ld_ind in native bpf") Reported-by: Bryce Kahle bryce.kahle@datadoghq.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Signed-off-by: Alexei Starovoitov ast@kernel.org Link: https://lore.kernel.org/bpf/cace836e4d07bb63b1a53e49c5dfb238a040c298.1599512... Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/filter.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/filter.c b/net/core/filter.c index 25a2c3186e14a..557bd5cc8f94c 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5418,8 +5418,6 @@ static int bpf_gen_ld_abs(const struct bpf_insn *orig, bool indirect = BPF_MODE(orig->code) == BPF_IND; struct bpf_insn *insn = insn_buf;
- /* We're guaranteed here that CTX is in R6. */ - *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); if (!indirect) { *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); } else { @@ -5427,6 +5425,8 @@ static int bpf_gen_ld_abs(const struct bpf_insn *orig, if (orig->imm) *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); } + /* We're guaranteed here that CTX is in R6. */ + *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX);
switch (BPF_SIZE(orig->code)) { case BPF_B: