Quelle  verifier_int_ptr.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/int_ptr.c */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

SEC("socket")
__description("arg pointer to long uninitialized")
__success
__naked void arg_ptr_to_long_uninitialized(void)
{
 asm volatile (" \
 /* bpf_strtoul arg1 (buf) */ \
 r7 = r10;     \
 r7 += -8;     \
 r0 = 0x00303036;    \
 *(u64*)(r7 + 0) = r0;    \
 r1 = r7;     \
 /* bpf_strtoul arg2 (buf_len) */ \
 r2 = 4;      \
 /* bpf_strtoul arg3 (flags) */ \
 r3 = 0;      \
 /* bpf_strtoul arg4 (res) */ \
 r7 += -8;     \
 r4 = r7;     \
 /* bpf_strtoul() */ \
 call %[bpf_strtoul];    \
 r0 = 1;      \
 exit;      \
" :
 : __imm(bpf_strtoul)
 : __clobber_all);
}

SEC("socket")
__description("arg pointer to long half-uninitialized")
__success
__retval(0)
__naked void ptr_to_long_half_uninitialized(void)
{
 asm volatile (" \
 /* bpf_strtoul arg1 (buf) */ \
 r7 = r10;     \
 r7 += -8;     \
 r0 = 0x00303036;    \
 *(u64*)(r7 + 0) = r0;    \
 r1 = r7;     \
 /* bpf_strtoul arg2 (buf_len) */ \
 r2 = 4;      \
 /* bpf_strtoul arg3 (flags) */ \
 r3 = 0;      \
 /* bpf_strtoul arg4 (res) */ \
 r7 += -8;     \
 *(u32*)(r7 + 0) = r0;    \
 r4 = r7;     \
 /* bpf_strtoul() */ \
 call %[bpf_strtoul];    \
 r0 = 0;      \
 exit;      \
" :
 : __imm(bpf_strtoul)
 : __clobber_all);
}

SEC("cgroup/sysctl")
__description("arg pointer to long misaligned")
__failure __msg("misaligned stack access off 0+-20+0 size 8")
__naked void arg_ptr_to_long_misaligned(void)
{
 asm volatile (" \
 /* bpf_strtoul arg1 (buf) */ \
 r7 = r10;     \
 r7 += -8;     \
 r0 = 0x00303036;    \
 *(u64*)(r7 + 0) = r0;    \
 r1 = r7;     \
 /* bpf_strtoul arg2 (buf_len) */ \
 r2 = 4;      \
 /* bpf_strtoul arg3 (flags) */ \
 r3 = 0;      \
 /* bpf_strtoul arg4 (res) */ \
 r7 += -12;     \
 r0 = 0;      \
 *(u32*)(r7 + 0) = r0;    \
 *(u64*)(r7 + 4) = r0;    \
 r4 = r7;     \
 /* bpf_strtoul() */ \
 call %[bpf_strtoul];    \
 r0 = 1;      \
 exit;      \
" :
 : __imm(bpf_strtoul)
 : __clobber_all);
}

SEC("cgroup/sysctl")
__description("arg pointer to long size < sizeof(long)")
__failure __msg("invalid write to stack R4 off=-4 size=8")
__naked void to_long_size_sizeof_long(void)
{
 asm volatile (" \
 /* bpf_strtoul arg1 (buf) */ \
 r7 = r10;     \
 r7 += -16;     \
 r0 = 0x00303036;    \
 *(u64*)(r7 + 0) = r0;    \
 r1 = r7;     \
 /* bpf_strtoul arg2 (buf_len) */ \
 r2 = 4;      \
 /* bpf_strtoul arg3 (flags) */ \
 r3 = 0;      \
 /* bpf_strtoul arg4 (res) */ \
 r7 += 12;     \
 *(u32*)(r7 + 0) = r0;    \
 r4 = r7;     \
 /* bpf_strtoul() */ \
 call %[bpf_strtoul];    \
 r0 = 1;      \
 exit;      \
" :
 : __imm(bpf_strtoul)
 : __clobber_all);
}

SEC("cgroup/sysctl")
__description("arg pointer to long initialized")
__success
__naked void arg_ptr_to_long_initialized(void)
{
 asm volatile (" \
 /* bpf_strtoul arg1 (buf) */ \
 r7 = r10;     \
 r7 += -8;     \
 r0 = 0x00303036;    \
 *(u64*)(r7 + 0) = r0;    \
 r1 = r7;     \
 /* bpf_strtoul arg2 (buf_len) */ \
 r2 = 4;      \
 /* bpf_strtoul arg3 (flags) */ \
 r3 = 0;      \
 /* bpf_strtoul arg4 (res) */ \
 r7 += -8;     \
 *(u64*)(r7 + 0) = r0;    \
 r4 = r7;     \
 /* bpf_strtoul() */ \
 call %[bpf_strtoul];    \
 r0 = 1;      \
 exit;      \
" :
 : __imm(bpf_strtoul)
 : __clobber_all);
}

char _license[] SEC("license") = "GPL";