Quelle  verifier_meta_access.c   Sprache: C

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

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

SEC("xdp")
__description("meta access, test1")
__success __retval(0)
__naked void meta_access_test1(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r0 = r2;     \
 r0 += 8;     \
 if r0 > r3 goto l0_%=;    \
 r0 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test2")
__failure __msg("invalid access to packet, off=-8")
__naked void meta_access_test2(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r0 = r2;     \
 r0 -= 8;     \
 r4 = r2;     \
 r4 += 8;     \
 if r4 > r3 goto l0_%=;    \
 r0 = *(u8*)(r0 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test3")
__failure __msg("invalid access to packet")
__naked void meta_access_test3(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data_end]);  \
 r0 = r2;     \
 r0 += 8;     \
 if r0 > r3 goto l0_%=;    \
 r0 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test4")
__failure __msg("invalid access to packet")
__naked void meta_access_test4(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data_end]);  \
 r4 = *(u32*)(r1 + %[xdp_md_data]);  \
 r0 = r4;     \
 r0 += 8;     \
 if r0 > r3 goto l0_%=;    \
 r0 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test5")
__failure __msg("R3 !read_ok")
__naked void meta_access_test5(void)
{
 asm volatile (" \
 r3 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r4 = *(u32*)(r1 + %[xdp_md_data]);  \
 r0 = r3;     \
 r0 += 8;     \
 if r0 > r4 goto l0_%=;    \
 r2 = -8;     \
 call %[bpf_xdp_adjust_meta];   \
 r0 = *(u8*)(r3 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm(bpf_xdp_adjust_meta),
   __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test6")
__failure __msg("invalid access to packet")
__naked void meta_access_test6(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r0 = r3;     \
 r0 += 8;     \
 r4 = r2;     \
 r4 += 8;     \
 if r4 > r0 goto l0_%=;    \
 r0 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test7")
__success __retval(0)
__naked void meta_access_test7(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r0 = r3;     \
 r0 += 8;     \
 r4 = r2;     \
 r4 += 8;     \
 if r4 > r3 goto l0_%=;    \
 r0 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test8")
__success __retval(0)
__naked void meta_access_test8(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r4 = r2;     \
 r4 += 0xFFFF;     \
 if r4 > r3 goto l0_%=;    \
 r0 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test9")
__failure __msg("invalid access to packet")
__naked void meta_access_test9(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r4 = r2;     \
 r4 += 0xFFFF;     \
 r4 += 1;     \
 if r4 > r3 goto l0_%=;    \
 r0 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test10")
__failure __msg("invalid access to packet")
__naked void meta_access_test10(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r4 = *(u32*)(r1 + %[xdp_md_data_end]);  \
 r5 = 42;     \
 r6 = 24;     \
 *(u64*)(r10 - 8) = r5;    \
 lock *(u64 *)(r10 - 8) += r6;   \
 r5 = *(u64*)(r10 - 8);    \
 if r5 > 100 goto l0_%=;    \
 r3 += r5;     \
 r5 = r3;     \
 r6 = r2;     \
 r6 += 8;     \
 if r6 > r5 goto l0_%=;    \
 r2 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test11")
__success __retval(0)
__naked void meta_access_test11(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r5 = 42;     \
 r6 = 24;     \
 *(u64*)(r10 - 8) = r5;    \
 lock *(u64 *)(r10 - 8) += r6;   \
 r5 = *(u64*)(r10 - 8);    \
 if r5 > 100 goto l0_%=;    \
 r2 += r5;     \
 r5 = r2;     \
 r6 = r2;     \
 r6 += 8;     \
 if r6 > r3 goto l0_%=;    \
 r5 = *(u8*)(r5 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

SEC("xdp")
__description("meta access, test12")
__success __retval(0)
__naked void meta_access_test12(void)
{
 asm volatile (" \
 r2 = *(u32*)(r1 + %[xdp_md_data_meta]);  \
 r3 = *(u32*)(r1 + %[xdp_md_data]);  \
 r4 = *(u32*)(r1 + %[xdp_md_data_end]);  \
 r5 = r3;     \
 r5 += 16;     \
 if r5 > r4 goto l0_%=;    \
 r0 = *(u8*)(r3 + 0);    \
 r5 = r2;     \
 r5 += 16;     \
 if r5 > r3 goto l0_%=;    \
 r0 = *(u8*)(r2 + 0);    \
l0_%=: r0 = 0;      \
 exit;      \
" :
 : __imm_const(xdp_md_data, offsetof(struct xdp_md, data)),
   __imm_const(xdp_md_data_end, offsetof(struct xdp_md, data_end)),
   __imm_const(xdp_md_data_meta, offsetof(struct xdp_md, data_meta))
 : __clobber_all);
}

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