93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Converted from tools/testing/selftests/bpf/verifier/leak_ptr.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_HASH);
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__uint(max_entries, 1);
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__type(key, long long);
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__type(value, long long);
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} map_hash_8b SEC(".maps");
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SEC("socket")
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__description("leak pointer into ctx 1")
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__failure __msg("BPF_ATOMIC stores into R1 ctx is not allowed")
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__failure_unpriv __msg_unpriv("R2 leaks addr into mem")
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__naked void leak_pointer_into_ctx_1(void)
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{
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asm volatile (" \
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r0 = 0; \
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*(u64*)(r1 + %[__sk_buff_cb_0]) = r0; \
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r2 = %[map_hash_8b] ll; \
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lock *(u64 *)(r1 + %[__sk_buff_cb_0]) += r2; \
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exit; \
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" :
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: __imm_addr(map_hash_8b),
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__imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
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: __clobber_all);
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}
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SEC("socket")
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__description("leak pointer into ctx 2")
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__failure __msg("BPF_ATOMIC stores into R1 ctx is not allowed")
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__failure_unpriv __msg_unpriv("R10 leaks addr into mem")
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__naked void leak_pointer_into_ctx_2(void)
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{
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asm volatile (" \
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r0 = 0; \
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*(u64*)(r1 + %[__sk_buff_cb_0]) = r0; \
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lock *(u64 *)(r1 + %[__sk_buff_cb_0]) += r10; \
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exit; \
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" :
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: __imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
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: __clobber_all);
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}
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SEC("socket")
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__description("leak pointer into ctx 3")
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__success __failure_unpriv __msg_unpriv("R2 leaks addr into ctx")
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__retval(0)
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__naked void leak_pointer_into_ctx_3(void)
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{
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asm volatile (" \
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r0 = 0; \
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r2 = %[map_hash_8b] ll; \
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*(u64*)(r1 + %[__sk_buff_cb_0]) = r2; \
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exit; \
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" :
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: __imm_addr(map_hash_8b),
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__imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
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: __clobber_all);
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}
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SEC("socket")
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__description("leak pointer into map val")
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__success __failure_unpriv __msg_unpriv("R6 leaks addr into mem")
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__retval(0)
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__naked void leak_pointer_into_map_val(void)
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{
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asm volatile (" \
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r6 = r1; \
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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_hash_8b] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r3 = 0; \
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*(u64*)(r0 + 0) = r3; \
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lock *(u64 *)(r0 + 0) += r6; \
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l0_%=: r0 = 0; \
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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_hash_8b)
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: __clobber_all);
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}
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char _license[] SEC("license") = "GPL";
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