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Adding verifier test for accessing const void pointer argument in tracing programs. The test program loads 1st argument of bpf_fentry_test10 function which is const void pointer and checks that verifier allows that. Signed-off-by: KaFai Wan <mannkafai@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/bpf/20250423121329.3163461-3-mannkafai@gmail.com
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/btf_ctx_access.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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SEC("fentry/bpf_modify_return_test")
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__description("btf_ctx_access accept")
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__success __retval(0)
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__naked void btf_ctx_access_accept(void)
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{
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asm volatile (" \
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r2 = *(u64 *)(r1 + 8); /* load 2nd argument value (int pointer) */\
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r0 = 0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("fentry/bpf_fentry_test9")
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__description("btf_ctx_access u32 pointer accept")
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__success __retval(0)
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__naked void ctx_access_u32_pointer_accept(void)
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{
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asm volatile (" \
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r2 = *(u64 *)(r1 + 0); /* load 1nd argument value (u32 pointer) */\
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r0 = 0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("fentry/bpf_fentry_test9")
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__description("btf_ctx_access u32 pointer reject u32")
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__failure __msg("size 4 must be 8")
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__naked void ctx_access_u32_pointer_reject_32(void)
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{
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asm volatile (" \
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r2 = *(u32 *)(r1 + 0); /* load 1st argument with narrow load */\
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r0 = 0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("fentry/bpf_fentry_test9")
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__description("btf_ctx_access u32 pointer reject u16")
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__failure __msg("size 2 must be 8")
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__naked void ctx_access_u32_pointer_reject_16(void)
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{
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asm volatile (" \
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r2 = *(u16 *)(r1 + 0); /* load 1st argument with narrow load */\
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r0 = 0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("fentry/bpf_fentry_test9")
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__description("btf_ctx_access u32 pointer reject u8")
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__failure __msg("size 1 must be 8")
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__naked void ctx_access_u32_pointer_reject_8(void)
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{
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asm volatile (" \
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r2 = *(u8 *)(r1 + 0); /* load 1st argument with narrow load */\
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r0 = 0; \
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exit; \
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" ::: __clobber_all);
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}
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SEC("fentry/bpf_fentry_test10")
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__description("btf_ctx_access const void pointer accept")
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__success __retval(0)
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__naked void ctx_access_const_void_pointer_accept(void)
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{
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asm volatile (" \
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r2 = *(u64 *)(r1 + 0); /* load 1st argument value (const void pointer) */\
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r0 = 0; \
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exit; \
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" ::: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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