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brintos / linux-shallow public Read only

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1/* SPDX-License-Identifier: GPL-2.0 */2#include <syscall.h>3#include <errno.h>4#include <stdio.h>5#include <stdlib.h>6#include <asm-generic/unistd.h>7 8static int mlock2_(void *start, size_t len, int flags)9{10	return syscall(__NR_mlock2, start, len, flags);11}12 13static FILE *seek_to_smaps_entry(unsigned long addr)14{15	FILE *file;16	char *line = NULL;17	size_t size = 0;18	unsigned long start, end;19	char perms[5];20	unsigned long offset;21	char dev[32];22	unsigned long inode;23	char path[BUFSIZ];24 25	file = fopen("/proc/self/smaps", "r");26	if (!file)27		ksft_exit_fail_msg("fopen smaps: %s\n", strerror(errno));28 29	while (getline(&line, &size, file) > 0) {30		if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",31			   &start, &end, perms, &offset, dev, &inode, path) < 6)32			goto next;33 34		if (start <= addr && addr < end)35			goto out;36 37next:38		free(line);39		line = NULL;40		size = 0;41	}42 43	fclose(file);44	file = NULL;45 46out:47	free(line);48	return file;49}50