cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bpf-script-test-prologue.c (1093B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * bpf-script-test-prologue.c
      4 * Test BPF prologue
      5 */
      6#ifndef LINUX_VERSION_CODE
      7# error Need LINUX_VERSION_CODE
      8# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
      9#endif
     10#define SEC(NAME) __attribute__((section(NAME), used))
     11
     12#include <uapi/linux/fs.h>
     13
     14/*
     15 * If CONFIG_PROFILE_ALL_BRANCHES is selected,
     16 * 'if' is redefined after include kernel header.
     17 * Recover 'if' for BPF object code.
     18 */
     19#ifdef if
     20# undef if
     21#endif
     22
     23#define FMODE_READ		0x1
     24#define FMODE_WRITE		0x2
     25
     26static void (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
     27	(void *) 6;
     28
     29SEC("func=null_lseek file->f_mode offset orig")
     30int bpf_func__null_lseek(void *ctx, int err, unsigned long _f_mode,
     31			 unsigned long offset, unsigned long orig)
     32{
     33	fmode_t f_mode = (fmode_t)_f_mode;
     34
     35	if (err)
     36		return 0;
     37	if (f_mode & FMODE_WRITE)
     38		return 0;
     39	if (offset & 1)
     40		return 0;
     41	if (orig == SEEK_CUR)
     42		return 0;
     43	return 1;
     44}
     45
     46char _license[] SEC("license") = "GPL";
     47int _version SEC("version") = LINUX_VERSION_CODE;