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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trace_vprintk.c (1632B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2021 Facebook */
      3
      4#include <test_progs.h>
      5
      6#include "trace_vprintk.lskel.h"
      7
      8#define TRACEBUF	"/sys/kernel/debug/tracing/trace_pipe"
      9#define SEARCHMSG	"1,2,3,4,5,6,7,8,9,10"
     10
     11void serial_test_trace_vprintk(void)
     12{
     13	struct trace_vprintk_lskel__bss *bss;
     14	int err = 0, iter = 0, found = 0;
     15	struct trace_vprintk_lskel *skel;
     16	char *buf = NULL;
     17	FILE *fp = NULL;
     18	size_t buflen;
     19
     20	skel = trace_vprintk_lskel__open_and_load();
     21	if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load"))
     22		goto cleanup;
     23
     24	bss = skel->bss;
     25
     26	err = trace_vprintk_lskel__attach(skel);
     27	if (!ASSERT_OK(err, "trace_vprintk__attach"))
     28		goto cleanup;
     29
     30	fp = fopen(TRACEBUF, "r");
     31	if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)"))
     32		goto cleanup;
     33
     34	/* We do not want to wait forever if this test fails... */
     35	fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
     36
     37	/* wait for tracepoint to trigger */
     38	usleep(1);
     39	trace_vprintk_lskel__detach(skel);
     40
     41	if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran"))
     42		goto cleanup;
     43
     44	if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret"))
     45		goto cleanup;
     46
     47	/* verify our search string is in the trace buffer */
     48	while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
     49		if (strstr(buf, SEARCHMSG) != NULL)
     50			found++;
     51		if (found == bss->trace_vprintk_ran)
     52			break;
     53		if (++iter > 1000)
     54			break;
     55	}
     56
     57	if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found"))
     58		goto cleanup;
     59
     60	if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret"))
     61		goto cleanup;
     62
     63cleanup:
     64	trace_vprintk_lskel__destroy(skel);
     65	free(buf);
     66	if (fp)
     67		fclose(fp);
     68}