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// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/leak_ptr.c */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1);
__type(key, long long);
__type(value, long long);
} map_hash_8b SEC(".maps");
SEC("socket")
__description("leak pointer into ctx 1")
__failure __msg("BPF_ATOMIC stores into R1 ctx is not allowed")
__failure_unpriv __msg_unpriv("R2 leaks addr into mem")
__naked void leak_pointer_into_ctx_1(void)
{
asm volatile (" \
r0 = 0; \
*(u64*)(r1 + %[__sk_buff_cb_0]) = r0; \
r2 = %[map_hash_8b] ll; \
lock *(u64 *)(r1 + %[__sk_buff_cb_0]) += r2; \
exit; \
" :
: __imm_addr(map_hash_8b),
__imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
: __clobber_all);
}
SEC("socket")
__description("leak pointer into ctx 2")
__failure __msg("BPF_ATOMIC stores into R1 ctx is not allowed")
__failure_unpriv __msg_unpriv("R10 leaks addr into mem")
__naked void leak_pointer_into_ctx_2(void)
{
asm volatile (" \
r0 = 0; \
*(u64*)(r1 + %[__sk_buff_cb_0]) = r0; \
lock *(u64 *)(r1 + %[__sk_buff_cb_0]) += r10; \
exit; \
" :
: __imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
: __clobber_all);
}
SEC("socket")
__description("leak pointer into ctx 3")
__success __failure_unpriv __msg_unpriv("R2 leaks addr into ctx")
__retval(0)
__naked void leak_pointer_into_ctx_3(void)
{
asm volatile (" \
r0 = 0; \
r2 = %[map_hash_8b] ll; \
*(u64*)(r1 + %[__sk_buff_cb_0]) = r2; \
exit; \
" :
: __imm_addr(map_hash_8b),
__imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0]))
: __clobber_all);
}
SEC("socket")
__description("leak pointer into map val")
__success __failure_unpriv __msg_unpriv("R6 leaks addr into mem")
__retval(0)
__naked void leak_pointer_into_map_val(void)
{
asm volatile (" \
r6 = r1; \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_hash_8b] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r3 = 0; \
*(u64*)(r0 + 0) = r3; \
lock *(u64 *)(r0 + 0) += r6; \
l0_%=: r0 = 0; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";
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