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/*
* unlink*() pre-check.
*
* Copyright 1999-2012 Gentoo Foundation
* Licensed under the GPL-2
*/
#include "headers.h"
#include "sbutil.h"
#include "libsandbox.h"
#include "wrappers.h"
bool sb_unlinkat_pre_check(const char *func, const char *pathname, int dirfd)
{
char canonic[SB_PATH_MAX];
save_errno();
/* Check incoming args against common *at issues */
char dirfd_path[SB_PATH_MAX];
if (!sb_common_at_pre_check(func, &pathname, dirfd, dirfd_path, sizeof(dirfd_path)))
return false;
/* Then break down any relative/symlink paths */
if (-1 == canonicalize(pathname, canonic))
/* see comments in check_syscall() */
if (ENAMETOOLONG != errno) {
sb_debug_dyn("EARLY FAIL: %s(%s) @ canonicalize: %s\n",
func, pathname, strerror(errno));
return false;
}
/* XXX: Hack to make sure sandboxed process cannot remove
* a device node, bug #79836. */
if (0 == strcmp(canonic, "/dev/null") ||
0 == strcmp(canonic, "/dev/zero"))
{
errno = EACCES;
sb_debug_dyn("EARLY FAIL: %s(%s): %s\n",
func, pathname, strerror(errno));
return false;
}
restore_errno();
return true;
}
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