35150203e3
Test verifier/prevent_map_lookup automatically converted to use inline assembly. This was a part of a series [1] but could not be applied becuase another patch from a series had to be witheld. [1] https://lore.kernel.org/bpf/20230421174234.2391278-1-eddyz87@gmail.com/ Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20230421204514.2450907-1-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/prevent_map_lookup.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_STACK_TRACE);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u64);
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} map_stacktrace SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
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__uint(max_entries, 8);
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__uint(key_size, sizeof(int));
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__array(values, void (void));
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} map_prog2_socket SEC(".maps");
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SEC("perf_event")
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__description("prevent map lookup in stack trace")
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__failure __msg("cannot pass map_type 7 into func bpf_map_lookup_elem")
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__naked void map_lookup_in_stack_trace(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_stacktrace] ll; \
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call %[bpf_map_lookup_elem]; \
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exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_stacktrace)
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: __clobber_all);
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}
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SEC("socket")
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__description("prevent map lookup in prog array")
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__failure __msg("cannot pass map_type 3 into func bpf_map_lookup_elem")
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__failure_unpriv
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__naked void map_lookup_in_prog_array(void)
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{
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asm volatile (" \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_prog2_socket] ll; \
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call %[bpf_map_lookup_elem]; \
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exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm_addr(map_prog2_socket)
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: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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