selftests/bpf: verifier/ringbuf.c converted to inline assembly
Test verifier/ringbuf.c automatically converted to use inline assembly. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230325025524.144043-34-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman
Alexei Starovoitov
parent
18cdc2b531
commit
b7e4203086
@ -30,6 +30,7 @@
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#include "verifier_meta_access.skel.h"
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#include "verifier_raw_stack.skel.h"
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#include "verifier_raw_tp_writable.skel.h"
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#include "verifier_ringbuf.skel.h"
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__maybe_unused
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static void run_tests_aux(const char *skel_name, skel_elf_bytes_fn elf_bytes_factory)
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@ -82,3 +83,4 @@ void test_verifier_masking(void) { RUN(verifier_masking); }
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void test_verifier_meta_access(void) { RUN(verifier_meta_access); }
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void test_verifier_raw_stack(void) { RUN(verifier_raw_stack); }
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void test_verifier_raw_tp_writable(void) { RUN(verifier_raw_tp_writable); }
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void test_verifier_ringbuf(void) { RUN(verifier_ringbuf); }
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131
tools/testing/selftests/bpf/progs/verifier_ringbuf.c
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131
tools/testing/selftests/bpf/progs/verifier_ringbuf.c
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@ -0,0 +1,131 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/ringbuf.c */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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struct {
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__uint(type, BPF_MAP_TYPE_RINGBUF);
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__uint(max_entries, 4096);
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} map_ringbuf SEC(".maps");
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SEC("socket")
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__description("ringbuf: invalid reservation offset 1")
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__failure __msg("R1 must have zero offset when passed to release func")
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__failure_unpriv
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__naked void ringbuf_invalid_reservation_offset_1(void)
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{
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asm volatile (" \
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/* reserve 8 byte ringbuf memory */ \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r1 = %[map_ringbuf] ll; \
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r2 = 8; \
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r3 = 0; \
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call %[bpf_ringbuf_reserve]; \
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/* store a pointer to the reserved memory in R6 */\
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r6 = r0; \
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/* check whether the reservation was successful */\
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if r0 == 0 goto l0_%=; \
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/* spill R6(mem) into the stack */ \
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*(u64*)(r10 - 8) = r6; \
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/* fill it back in R7 */ \
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r7 = *(u64*)(r10 - 8); \
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/* should be able to access *(R7) = 0 */ \
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r1 = 0; \
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*(u64*)(r7 + 0) = r1; \
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/* submit the reserved ringbuf memory */ \
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r1 = r7; \
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/* add invalid offset to reserved ringbuf memory */\
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r1 += 0xcafe; \
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r2 = 0; \
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call %[bpf_ringbuf_submit]; \
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l0_%=: r0 = 0; \
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exit; \
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" :
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: __imm(bpf_ringbuf_reserve),
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__imm(bpf_ringbuf_submit),
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__imm_addr(map_ringbuf)
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: __clobber_all);
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}
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SEC("socket")
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__description("ringbuf: invalid reservation offset 2")
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__failure __msg("R7 min value is outside of the allowed memory range")
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__failure_unpriv
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__naked void ringbuf_invalid_reservation_offset_2(void)
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{
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asm volatile (" \
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/* reserve 8 byte ringbuf memory */ \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r1 = %[map_ringbuf] ll; \
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r2 = 8; \
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r3 = 0; \
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call %[bpf_ringbuf_reserve]; \
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/* store a pointer to the reserved memory in R6 */\
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r6 = r0; \
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/* check whether the reservation was successful */\
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if r0 == 0 goto l0_%=; \
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/* spill R6(mem) into the stack */ \
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*(u64*)(r10 - 8) = r6; \
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/* fill it back in R7 */ \
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r7 = *(u64*)(r10 - 8); \
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/* add invalid offset to reserved ringbuf memory */\
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r7 += 0xcafe; \
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/* should be able to access *(R7) = 0 */ \
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r1 = 0; \
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*(u64*)(r7 + 0) = r1; \
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/* submit the reserved ringbuf memory */ \
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r1 = r7; \
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r2 = 0; \
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call %[bpf_ringbuf_submit]; \
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l0_%=: r0 = 0; \
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exit; \
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" :
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: __imm(bpf_ringbuf_reserve),
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__imm(bpf_ringbuf_submit),
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__imm_addr(map_ringbuf)
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: __clobber_all);
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}
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SEC("xdp")
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__description("ringbuf: check passing rb mem to helpers")
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__success __retval(0)
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__naked void passing_rb_mem_to_helpers(void)
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{
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asm volatile (" \
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r6 = r1; \
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/* reserve 8 byte ringbuf memory */ \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r1 = %[map_ringbuf] ll; \
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r2 = 8; \
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r3 = 0; \
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call %[bpf_ringbuf_reserve]; \
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r7 = r0; \
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/* check whether the reservation was successful */\
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if r0 != 0 goto l0_%=; \
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exit; \
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l0_%=: /* pass allocated ring buffer memory to fib lookup */\
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r1 = r6; \
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r2 = r0; \
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r3 = 8; \
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r4 = 0; \
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call %[bpf_fib_lookup]; \
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/* submit the ringbuf memory */ \
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r1 = r7; \
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r2 = 0; \
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call %[bpf_ringbuf_submit]; \
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r0 = 0; \
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exit; \
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" :
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: __imm(bpf_fib_lookup),
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__imm(bpf_ringbuf_reserve),
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__imm(bpf_ringbuf_submit),
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__imm_addr(map_ringbuf)
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: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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@ -1,95 +0,0 @@
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{
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"ringbuf: invalid reservation offset 1",
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.insns = {
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/* reserve 8 byte ringbuf memory */
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_MOV64_IMM(BPF_REG_2, 8),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve),
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/* store a pointer to the reserved memory in R6 */
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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/* check whether the reservation was successful */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 7),
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/* spill R6(mem) into the stack */
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
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/* fill it back in R7 */
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BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_10, -8),
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/* should be able to access *(R7) = 0 */
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BPF_ST_MEM(BPF_DW, BPF_REG_7, 0, 0),
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/* submit the reserved ringbuf memory */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
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/* add invalid offset to reserved ringbuf memory */
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0xcafe),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_ringbuf = { 1 },
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.result = REJECT,
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.errstr = "R1 must have zero offset when passed to release func",
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},
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{
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"ringbuf: invalid reservation offset 2",
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.insns = {
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/* reserve 8 byte ringbuf memory */
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_MOV64_IMM(BPF_REG_2, 8),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve),
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/* store a pointer to the reserved memory in R6 */
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
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/* check whether the reservation was successful */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 7),
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/* spill R6(mem) into the stack */
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BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8),
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/* fill it back in R7 */
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BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_10, -8),
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/* add invalid offset to reserved ringbuf memory */
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, 0xcafe),
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/* should be able to access *(R7) = 0 */
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BPF_ST_MEM(BPF_DW, BPF_REG_7, 0, 0),
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/* submit the reserved ringbuf memory */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_ringbuf = { 1 },
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.result = REJECT,
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.errstr = "R7 min value is outside of the allowed memory range",
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},
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{
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"ringbuf: check passing rb mem to helpers",
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.insns = {
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BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
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/* reserve 8 byte ringbuf memory */
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_MOV64_IMM(BPF_REG_2, 8),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve),
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BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
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/* check whether the reservation was successful */
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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/* pass allocated ring buffer memory to fib lookup */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
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BPF_MOV64_IMM(BPF_REG_3, 8),
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BPF_MOV64_IMM(BPF_REG_4, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_fib_lookup),
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/* submit the ringbuf memory */
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.fixup_map_ringbuf = { 2 },
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.prog_type = BPF_PROG_TYPE_XDP,
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.result = ACCEPT,
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},
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