tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/bpf.h>
4#include <bpf/bpf_helpers.h>
5#include "bpf_misc.h"
6
7SEC("socket")
8__description("scalars: find linked scalars")
9__failure
10__msg("math between fp pointer and 2147483647 is not allowed")
11__naked void scalars(void)
12{
13 asm volatile (" \
14 r0 = 0; \
15 r1 = 0x80000001 ll; \
16 r1 /= 1; \
17 r2 = r1; \
18 r4 = r1; \
19 w2 += 0x7FFFFFFF; \
20 w4 += 0; \
21 if r2 == 0 goto l1; \
22 exit; \
23l1: \
24 r4 >>= 63; \
25 r3 = 1; \
26 r3 -= r4; \
27 r3 *= 0x7FFFFFFF; \
28 r3 += r10; \
29 *(u8*)(r3 - 1) = r0; \
30 exit; \
31" ::: __clobber_all);
32}
33
34char _license[] SEC("license") = "GPL";