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b7e4203086
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>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
// 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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