Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf
Daniel Borkmann says: ==================== pull-request: bpf 2021-09-28 The following pull-request contains BPF updates for your *net* tree. We've added 10 non-merge commits during the last 14 day(s) which contain a total of 11 files changed, 139 insertions(+), 53 deletions(-). The main changes are: 1) Fix MIPS JIT jump code emission for too large offsets, from Piotr Krysiuk. 2) Fix x86 JIT atomic/fetch emission when dst reg maps to rax, from Johan Almbladh. 3) Fix cgroup_sk_alloc corner case when called from interrupt, from Daniel Borkmann. 4) Fix segfault in libbpf's linker for objects without BTF, from Kumar Kartikeya Dwivedi. 5) Fix bpf_jit_charge_modmem for applications with CAP_BPF, from Lorenz Bauer. 6) Fix return value handling for struct_ops BPF programs, from Hou Tao. 7) Various fixes to BPF selftests, from Jiri Benc. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> ,
This commit is contained in:
David S. Miller
Коммит
4ccb9f03fe
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@ -3384,9 +3384,11 @@ F: Documentation/networking/filter.rst
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F: Documentation/userspace-api/ebpf/
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F: arch/*/net/*
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F: include/linux/bpf*
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F: include/linux/btf*
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F: include/linux/filter.h
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F: include/trace/events/xdp.h
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F: include/uapi/linux/bpf*
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F: include/uapi/linux/btf*
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F: include/uapi/linux/filter.h
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F: kernel/bpf/
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F: kernel/trace/bpf_trace.c
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@ -662,6 +662,11 @@ static void build_epilogue(struct jit_ctx *ctx)
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((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative : func) : \
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func##_positive)
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static bool is_bad_offset(int b_off)
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{
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return b_off > 0x1ffff || b_off < -0x20000;
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}
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static int build_body(struct jit_ctx *ctx)
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{
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const struct bpf_prog *prog = ctx->skf;
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@ -728,7 +733,10 @@ load_common:
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/* Load return register on DS for failures */
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emit_reg_move(r_ret, r_zero, ctx);
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/* Return with error */
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emit_b(b_imm(prog->len, ctx), ctx);
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b_off = b_imm(prog->len, ctx);
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if (is_bad_offset(b_off))
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return -E2BIG;
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emit_b(b_off, ctx);
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emit_nop(ctx);
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break;
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case BPF_LD | BPF_W | BPF_IND:
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@ -775,8 +783,10 @@ load_ind:
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emit_jalr(MIPS_R_RA, r_s0, ctx);
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emit_reg_move(MIPS_R_A0, r_skb, ctx); /* delay slot */
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/* Check the error value */
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emit_bcond(MIPS_COND_NE, r_ret, 0,
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b_imm(prog->len, ctx), ctx);
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b_off = b_imm(prog->len, ctx);
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if (is_bad_offset(b_off))
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return -E2BIG;
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emit_bcond(MIPS_COND_NE, r_ret, 0, b_off, ctx);
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emit_reg_move(r_ret, r_zero, ctx);
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/* We are good */
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/* X <- P[1:K] & 0xf */
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@ -855,8 +865,10 @@ load_ind:
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/* A /= X */
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ctx->flags |= SEEN_X | SEEN_A;
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/* Check if r_X is zero */
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emit_bcond(MIPS_COND_EQ, r_X, r_zero,
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b_imm(prog->len, ctx), ctx);
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b_off = b_imm(prog->len, ctx);
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if (is_bad_offset(b_off))
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return -E2BIG;
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emit_bcond(MIPS_COND_EQ, r_X, r_zero, b_off, ctx);
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emit_load_imm(r_ret, 0, ctx); /* delay slot */
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emit_div(r_A, r_X, ctx);
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break;
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@ -864,8 +876,10 @@ load_ind:
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/* A %= X */
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ctx->flags |= SEEN_X | SEEN_A;
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/* Check if r_X is zero */
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emit_bcond(MIPS_COND_EQ, r_X, r_zero,
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b_imm(prog->len, ctx), ctx);
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b_off = b_imm(prog->len, ctx);
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if (is_bad_offset(b_off))
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return -E2BIG;
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emit_bcond(MIPS_COND_EQ, r_X, r_zero, b_off, ctx);
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emit_load_imm(r_ret, 0, ctx); /* delay slot */
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emit_mod(r_A, r_X, ctx);
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break;
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@ -926,7 +940,10 @@ load_ind:
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break;
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case BPF_JMP | BPF_JA:
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/* pc += K */
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emit_b(b_imm(i + k + 1, ctx), ctx);
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b_off = b_imm(i + k + 1, ctx);
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if (is_bad_offset(b_off))
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return -E2BIG;
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emit_b(b_off, ctx);
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emit_nop(ctx);
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break;
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case BPF_JMP | BPF_JEQ | BPF_K:
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@ -1056,12 +1073,16 @@ jmp_cmp:
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break;
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case BPF_RET | BPF_A:
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ctx->flags |= SEEN_A;
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if (i != prog->len - 1)
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if (i != prog->len - 1) {
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/*
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* If this is not the last instruction
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* then jump to the epilogue
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*/
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emit_b(b_imm(prog->len, ctx), ctx);
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b_off = b_imm(prog->len, ctx);
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if (is_bad_offset(b_off))
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return -E2BIG;
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emit_b(b_off, ctx);
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}
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emit_reg_move(r_ret, r_A, ctx); /* delay slot */
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break;
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case BPF_RET | BPF_K:
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@ -1075,7 +1096,10 @@ jmp_cmp:
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* If this is not the last instruction
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* then jump to the epilogue
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*/
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emit_b(b_imm(prog->len, ctx), ctx);
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b_off = b_imm(prog->len, ctx);
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if (is_bad_offset(b_off))
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return -E2BIG;
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emit_b(b_off, ctx);
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emit_nop(ctx);
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}
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break;
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@ -1133,8 +1157,10 @@ jmp_cmp:
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/* Load *dev pointer */
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emit_load_ptr(r_s0, r_skb, off, ctx);
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/* error (0) in the delay slot */
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emit_bcond(MIPS_COND_EQ, r_s0, r_zero,
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b_imm(prog->len, ctx), ctx);
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b_off = b_imm(prog->len, ctx);
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if (is_bad_offset(b_off))
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return -E2BIG;
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emit_bcond(MIPS_COND_EQ, r_s0, r_zero, b_off, ctx);
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emit_reg_move(r_ret, r_zero, ctx);
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if (code == (BPF_ANC | SKF_AD_IFINDEX)) {
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BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4);
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@ -1244,7 +1270,10 @@ void bpf_jit_compile(struct bpf_prog *fp)
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/* Generate the actual JIT code */
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build_prologue(&ctx);
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build_body(&ctx);
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if (build_body(&ctx)) {
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module_memfree(ctx.target);
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goto out;
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}
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build_epilogue(&ctx);
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/* Update the icache */
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@ -1341,9 +1341,10 @@ st: if (is_imm8(insn->off))
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if (insn->imm == (BPF_AND | BPF_FETCH) ||
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insn->imm == (BPF_OR | BPF_FETCH) ||
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insn->imm == (BPF_XOR | BPF_FETCH)) {
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u8 *branch_target;
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bool is64 = BPF_SIZE(insn->code) == BPF_DW;
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u32 real_src_reg = src_reg;
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u32 real_dst_reg = dst_reg;
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u8 *branch_target;
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/*
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* Can't be implemented with a single x86 insn.
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@ -1354,11 +1355,13 @@ st: if (is_imm8(insn->off))
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emit_mov_reg(&prog, true, BPF_REG_AX, BPF_REG_0);
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if (src_reg == BPF_REG_0)
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real_src_reg = BPF_REG_AX;
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if (dst_reg == BPF_REG_0)
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real_dst_reg = BPF_REG_AX;
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branch_target = prog;
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/* Load old value */
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emit_ldx(&prog, BPF_SIZE(insn->code),
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BPF_REG_0, dst_reg, insn->off);
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BPF_REG_0, real_dst_reg, insn->off);
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/*
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* Perform the (commutative) operation locally,
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* put the result in the AUX_REG.
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@ -1369,7 +1372,8 @@ st: if (is_imm8(insn->off))
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add_2reg(0xC0, AUX_REG, real_src_reg));
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/* Attempt to swap in new value */
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err = emit_atomic(&prog, BPF_CMPXCHG,
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dst_reg, AUX_REG, insn->off,
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real_dst_reg, AUX_REG,
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insn->off,
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BPF_SIZE(insn->code));
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if (WARN_ON(err))
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return err;
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@ -1383,11 +1387,10 @@ st: if (is_imm8(insn->off))
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/* Restore R0 after clobbering RAX */
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emit_mov_reg(&prog, true, BPF_REG_0, BPF_REG_AX);
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break;
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}
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err = emit_atomic(&prog, insn->imm, dst_reg, src_reg,
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insn->off, BPF_SIZE(insn->code));
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insn->off, BPF_SIZE(insn->code));
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if (err)
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return err;
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break;
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@ -1744,7 +1747,7 @@ static void restore_regs(const struct btf_func_model *m, u8 **prog, int nr_args,
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}
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static int invoke_bpf_prog(const struct btf_func_model *m, u8 **pprog,
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struct bpf_prog *p, int stack_size, bool mod_ret)
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struct bpf_prog *p, int stack_size, bool save_ret)
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{
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u8 *prog = *pprog;
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u8 *jmp_insn;
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@ -1777,11 +1780,15 @@ static int invoke_bpf_prog(const struct btf_func_model *m, u8 **pprog,
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if (emit_call(&prog, p->bpf_func, prog))
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return -EINVAL;
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/* BPF_TRAMP_MODIFY_RETURN trampolines can modify the return
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/*
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* BPF_TRAMP_MODIFY_RETURN trampolines can modify the return
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* of the previous call which is then passed on the stack to
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* the next BPF program.
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*
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* BPF_TRAMP_FENTRY trampoline may need to return the return
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* value of BPF_PROG_TYPE_STRUCT_OPS prog.
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*/
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if (mod_ret)
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if (save_ret)
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emit_stx(&prog, BPF_DW, BPF_REG_FP, BPF_REG_0, -8);
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/* replace 2 nops with JE insn, since jmp target is known */
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@ -1828,13 +1835,15 @@ static int emit_cond_near_jump(u8 **pprog, void *func, void *ip, u8 jmp_cond)
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}
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static int invoke_bpf(const struct btf_func_model *m, u8 **pprog,
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struct bpf_tramp_progs *tp, int stack_size)
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struct bpf_tramp_progs *tp, int stack_size,
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bool save_ret)
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{
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int i;
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u8 *prog = *pprog;
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for (i = 0; i < tp->nr_progs; i++) {
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if (invoke_bpf_prog(m, &prog, tp->progs[i], stack_size, false))
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if (invoke_bpf_prog(m, &prog, tp->progs[i], stack_size,
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save_ret))
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return -EINVAL;
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}
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*pprog = prog;
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@ -1877,6 +1886,23 @@ static int invoke_bpf_mod_ret(const struct btf_func_model *m, u8 **pprog,
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return 0;
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}
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static bool is_valid_bpf_tramp_flags(unsigned int flags)
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{
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if ((flags & BPF_TRAMP_F_RESTORE_REGS) &&
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(flags & BPF_TRAMP_F_SKIP_FRAME))
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return false;
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|
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/*
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* BPF_TRAMP_F_RET_FENTRY_RET is only used by bpf_struct_ops,
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* and it must be used alone.
|
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*/
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if ((flags & BPF_TRAMP_F_RET_FENTRY_RET) &&
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(flags & ~BPF_TRAMP_F_RET_FENTRY_RET))
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return false;
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|
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return true;
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}
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|
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/* Example:
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* __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
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* its 'struct btf_func_model' will be nr_args=2
|
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|
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@ -1949,17 +1975,19 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
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struct bpf_tramp_progs *fmod_ret = &tprogs[BPF_TRAMP_MODIFY_RETURN];
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u8 **branches = NULL;
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u8 *prog;
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bool save_ret;
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|
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/* x86-64 supports up to 6 arguments. 7+ can be added in the future */
|
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if (nr_args > 6)
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return -ENOTSUPP;
|
||||
|
||||
if ((flags & BPF_TRAMP_F_RESTORE_REGS) &&
|
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(flags & BPF_TRAMP_F_SKIP_FRAME))
|
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if (!is_valid_bpf_tramp_flags(flags))
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return -EINVAL;
|
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|
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if (flags & BPF_TRAMP_F_CALL_ORIG)
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stack_size += 8; /* room for return value of orig_call */
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/* room for return value of orig_call or fentry prog */
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save_ret = flags & (BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_RET_FENTRY_RET);
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if (save_ret)
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stack_size += 8;
|
||||
|
||||
if (flags & BPF_TRAMP_F_IP_ARG)
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stack_size += 8; /* room for IP address argument */
|
||||
|
|
@ -2005,7 +2033,8 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
|
|||
}
|
||||
|
||||
if (fentry->nr_progs)
|
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if (invoke_bpf(m, &prog, fentry, stack_size))
|
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if (invoke_bpf(m, &prog, fentry, stack_size,
|
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flags & BPF_TRAMP_F_RET_FENTRY_RET))
|
||||
return -EINVAL;
|
||||
|
||||
if (fmod_ret->nr_progs) {
|
||||
|
|
@ -2052,7 +2081,7 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
|
|||
}
|
||||
|
||||
if (fexit->nr_progs)
|
||||
if (invoke_bpf(m, &prog, fexit, stack_size)) {
|
||||
if (invoke_bpf(m, &prog, fexit, stack_size, false)) {
|
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ret = -EINVAL;
|
||||
goto cleanup;
|
||||
}
|
||||
|
|
@ -2072,9 +2101,10 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image, void *i
|
|||
ret = -EINVAL;
|
||||
goto cleanup;
|
||||
}
|
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/* restore original return value back into RAX */
|
||||
emit_ldx(&prog, BPF_DW, BPF_REG_0, BPF_REG_FP, -8);
|
||||
}
|
||||
/* restore return value of orig_call or fentry prog back into RAX */
|
||||
if (save_ret)
|
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emit_ldx(&prog, BPF_DW, BPF_REG_0, BPF_REG_FP, -8);
|
||||
|
||||
EMIT1(0x5B); /* pop rbx */
|
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EMIT1(0xC9); /* leave */
|
||||
|
|
|
|||
|
|
@ -578,11 +578,12 @@ struct btf_func_model {
|
|||
* programs only. Should not be used with normal calls and indirect calls.
|
||||
*/
|
||||
#define BPF_TRAMP_F_SKIP_FRAME BIT(2)
|
||||
|
||||
/* Store IP address of the caller on the trampoline stack,
|
||||
* so it's available for trampoline's programs.
|
||||
*/
|
||||
#define BPF_TRAMP_F_IP_ARG BIT(3)
|
||||
/* Return the return value of fentry prog. Only used by bpf_struct_ops. */
|
||||
#define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
|
||||
|
||||
/* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
|
||||
* bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
|
||||
|
|
|
|||
|
|
@ -368,6 +368,7 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
|
|||
const struct btf_type *mtype, *ptype;
|
||||
struct bpf_prog *prog;
|
||||
u32 moff;
|
||||
u32 flags;
|
||||
|
||||
moff = btf_member_bit_offset(t, member) / 8;
|
||||
ptype = btf_type_resolve_ptr(btf_vmlinux, member->type, NULL);
|
||||
|
|
@ -431,10 +432,12 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
|
|||
|
||||
tprogs[BPF_TRAMP_FENTRY].progs[0] = prog;
|
||||
tprogs[BPF_TRAMP_FENTRY].nr_progs = 1;
|
||||
flags = st_ops->func_models[i].ret_size > 0 ?
|
||||
BPF_TRAMP_F_RET_FENTRY_RET : 0;
|
||||
err = arch_prepare_bpf_trampoline(NULL, image,
|
||||
st_map->image + PAGE_SIZE,
|
||||
&st_ops->func_models[i], 0,
|
||||
tprogs, NULL);
|
||||
&st_ops->func_models[i],
|
||||
flags, tprogs, NULL);
|
||||
if (err < 0)
|
||||
goto reset_unlock;
|
||||
|
||||
|
|
|
|||
|
|
@ -827,7 +827,7 @@ int bpf_jit_charge_modmem(u32 pages)
|
|||
{
|
||||
if (atomic_long_add_return(pages, &bpf_jit_current) >
|
||||
(bpf_jit_limit >> PAGE_SHIFT)) {
|
||||
if (!capable(CAP_SYS_ADMIN)) {
|
||||
if (!bpf_capable()) {
|
||||
atomic_long_sub(pages, &bpf_jit_current);
|
||||
return -EPERM;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -6574,22 +6574,29 @@ int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v)
|
|||
|
||||
void cgroup_sk_alloc(struct sock_cgroup_data *skcd)
|
||||
{
|
||||
/* Don't associate the sock with unrelated interrupted task's cgroup. */
|
||||
if (in_interrupt())
|
||||
return;
|
||||
struct cgroup *cgroup;
|
||||
|
||||
rcu_read_lock();
|
||||
/* Don't associate the sock with unrelated interrupted task's cgroup. */
|
||||
if (in_interrupt()) {
|
||||
cgroup = &cgrp_dfl_root.cgrp;
|
||||
cgroup_get(cgroup);
|
||||
goto out;
|
||||
}
|
||||
|
||||
while (true) {
|
||||
struct css_set *cset;
|
||||
|
||||
cset = task_css_set(current);
|
||||
if (likely(cgroup_tryget(cset->dfl_cgrp))) {
|
||||
skcd->cgroup = cset->dfl_cgrp;
|
||||
cgroup_bpf_get(cset->dfl_cgrp);
|
||||
cgroup = cset->dfl_cgrp;
|
||||
break;
|
||||
}
|
||||
cpu_relax();
|
||||
}
|
||||
out:
|
||||
skcd->cgroup = cgroup;
|
||||
cgroup_bpf_get(cgroup);
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -552,6 +552,12 @@ static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
|
|||
__skb->gso_segs = skb_shinfo(skb)->gso_segs;
|
||||
}
|
||||
|
||||
static struct proto bpf_dummy_proto = {
|
||||
.name = "bpf_dummy",
|
||||
.owner = THIS_MODULE,
|
||||
.obj_size = sizeof(struct sock),
|
||||
};
|
||||
|
||||
int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
|
||||
union bpf_attr __user *uattr)
|
||||
{
|
||||
|
|
@ -596,20 +602,19 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
|
|||
break;
|
||||
}
|
||||
|
||||
sk = kzalloc(sizeof(struct sock), GFP_USER);
|
||||
sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
|
||||
if (!sk) {
|
||||
kfree(data);
|
||||
kfree(ctx);
|
||||
return -ENOMEM;
|
||||
}
|
||||
sock_net_set(sk, net);
|
||||
sock_init_data(NULL, sk);
|
||||
|
||||
skb = build_skb(data, 0);
|
||||
if (!skb) {
|
||||
kfree(data);
|
||||
kfree(ctx);
|
||||
kfree(sk);
|
||||
sk_free(sk);
|
||||
return -ENOMEM;
|
||||
}
|
||||
skb->sk = sk;
|
||||
|
|
@ -682,8 +687,7 @@ out:
|
|||
if (dev && dev != net->loopback_dev)
|
||||
dev_put(dev);
|
||||
kfree_skb(skb);
|
||||
bpf_sk_storage_free(sk);
|
||||
kfree(sk);
|
||||
sk_free(sk);
|
||||
kfree(ctx);
|
||||
return ret;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1649,11 +1649,17 @@ static bool btf_is_non_static(const struct btf_type *t)
|
|||
static int find_glob_sym_btf(struct src_obj *obj, Elf64_Sym *sym, const char *sym_name,
|
||||
int *out_btf_sec_id, int *out_btf_id)
|
||||
{
|
||||
int i, j, n = btf__get_nr_types(obj->btf), m, btf_id = 0;
|
||||
int i, j, n, m, btf_id = 0;
|
||||
const struct btf_type *t;
|
||||
const struct btf_var_secinfo *vi;
|
||||
const char *name;
|
||||
|
||||
if (!obj->btf) {
|
||||
pr_warn("failed to find BTF info for object '%s'\n", obj->filename);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
n = btf__get_nr_types(obj->btf);
|
||||
for (i = 1; i <= n; i++) {
|
||||
t = btf__type_by_id(obj->btf, i);
|
||||
|
||||
|
|
|
|||
|
|
@ -375,7 +375,8 @@ $(TRUNNER_BPF_OBJS): $(TRUNNER_OUTPUT)/%.o: \
|
|||
$(TRUNNER_BPF_PROGS_DIR)/%.c \
|
||||
$(TRUNNER_BPF_PROGS_DIR)/*.h \
|
||||
$$(INCLUDE_DIR)/vmlinux.h \
|
||||
$(wildcard $(BPFDIR)/bpf_*.h) | $(TRUNNER_OUTPUT)
|
||||
$(wildcard $(BPFDIR)/bpf_*.h) \
|
||||
| $(TRUNNER_OUTPUT) $$(BPFOBJ)
|
||||
$$(call $(TRUNNER_BPF_BUILD_RULE),$$<,$$@, \
|
||||
$(TRUNNER_BPF_CFLAGS))
|
||||
|
||||
|
|
|
|||
|
|
@ -112,6 +112,14 @@ setup()
|
|||
ip netns add "${NS2}"
|
||||
ip netns add "${NS3}"
|
||||
|
||||
# rp_filter gets confused by what these tests are doing, so disable it
|
||||
ip netns exec ${NS1} sysctl -wq net.ipv4.conf.all.rp_filter=0
|
||||
ip netns exec ${NS2} sysctl -wq net.ipv4.conf.all.rp_filter=0
|
||||
ip netns exec ${NS3} sysctl -wq net.ipv4.conf.all.rp_filter=0
|
||||
ip netns exec ${NS1} sysctl -wq net.ipv4.conf.default.rp_filter=0
|
||||
ip netns exec ${NS2} sysctl -wq net.ipv4.conf.default.rp_filter=0
|
||||
ip netns exec ${NS3} sysctl -wq net.ipv4.conf.default.rp_filter=0
|
||||
|
||||
ip link add veth1 type veth peer name veth2
|
||||
ip link add veth3 type veth peer name veth4
|
||||
ip link add veth5 type veth peer name veth6
|
||||
|
|
@ -236,11 +244,6 @@ setup()
|
|||
ip -netns ${NS1} -6 route add ${IPv6_GRE}/128 dev veth5 via ${IPv6_6} ${VRF}
|
||||
ip -netns ${NS2} -6 route add ${IPv6_GRE}/128 dev veth7 via ${IPv6_8} ${VRF}
|
||||
|
||||
# rp_filter gets confused by what these tests are doing, so disable it
|
||||
ip netns exec ${NS1} sysctl -wq net.ipv4.conf.all.rp_filter=0
|
||||
ip netns exec ${NS2} sysctl -wq net.ipv4.conf.all.rp_filter=0
|
||||
ip netns exec ${NS3} sysctl -wq net.ipv4.conf.all.rp_filter=0
|
||||
|
||||
TMPFILE=$(mktemp /tmp/test_lwt_ip_encap.XXXXXX)
|
||||
|
||||
sleep 1 # reduce flakiness
|
||||
|
|
|
|||
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