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seccomp implementation

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valoq 2017-12-30 13:46:07 +01:00
parent 3093c7955e
commit 4bde3d793f
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6 changed files with 613 additions and 0 deletions
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4
Makefile
View file

@ -23,6 +23,10 @@ ifneq ($(WITH_SYNCTEX),0)
CPPFLAGS += -DWITH_SYNCTEX
endif
ifneq ($(WITH_SECCOMP),0)
CPPFLAGS += -DWITH_SECCOMP
endif
ifneq ($(wildcard ${VALGRIND_SUPPRESSION_FILE}),)
VALGRIND_ARGUMENTS += --suppressions=${VALGRIND_SUPPRESSION_FILE}
endif

12
config.mk
View file

@ -47,6 +47,10 @@ WITH_SYNCTEX ?= $(shell (${PKG_CONFIG} synctex && echo 1) || echo 0)
# To disable support for mimetype detction with libmagic set WITH_MAGIC to 0.
WITH_MAGIC ?= 1
# seccomp
# To enable support for seccomp filter set WITH_SECCOMP to 1.
WITH_SECCOMP ?= 0
# paths
PREFIX ?= /usr
MANPREFIX ?= ${PREFIX}/share/man
@ -116,6 +120,14 @@ LIBS += ${SYNCTEX_LIB}
endif
endif
ifneq (${WITH_SECCOMP},0)
SECCOMP_INC ?=
SECCOMP_LIB ?= -lseccomp
INCS += ${SECCOMP_INC}
LIBS += ${SECCOMP_LIB}
endif
ifneq (${PKG_CONFIG_LIBS},)
INCS += $(shell ${PKG_CONFIG} --cflags ${PKG_CONFIG_LIBS})
LIBS += $(shell ${PKG_CONFIG} --libs ${PKG_CONFIG_LIBS})

554
zathura/libsec.c Normal file
View file

@ -0,0 +1,554 @@
#include "libsec.h"
#include <stdio.h>
#ifdef WITH_SECCOMP
#include <seccomp.h> /* libseccomp */
#include <sys/prctl.h> /* prctl */
#include <sys/socket.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#define DENY_RULE(call) { if (seccomp_rule_add (ctx, SCMP_ACT_KILL, SCMP_SYS(call), 0) < 0) goto out; }
#define ALLOW_RULE(call) { if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(call), 0) < 0) goto out; }
scmp_filter_ctx ctx;
int protectedMode(void){
/* prevent child processes from getting more priv e.g. via setuid, capabilities, ... */
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
perror("prctl SET_NO_NEW_PRIVS");
exit(EXIT_FAILURE);
}
/* prevent escape via ptrace */
if(prctl (PR_SET_DUMPABLE, 0, 0, 0, 0)){
perror("prctl PR_SET_DUMPABLE");
exit(EXIT_FAILURE);
}
/* initialize the filter */
ctx = seccomp_init(SCMP_ACT_ALLOW);
if (ctx == NULL){
perror("seccomp_init failed");
exit(EXIT_FAILURE);
}
DENY_RULE (_sysctl);
DENY_RULE (acct);
DENY_RULE (add_key);
DENY_RULE (adjtimex);
DENY_RULE (chroot);
DENY_RULE (clock_adjtime);
DENY_RULE (create_module);
DENY_RULE (delete_module);
DENY_RULE (fanotify_init);
DENY_RULE (finit_module);
DENY_RULE (get_kernel_syms);
DENY_RULE (get_mempolicy);
DENY_RULE (init_module);
DENY_RULE (io_cancel);
DENY_RULE (io_destroy);
DENY_RULE (io_getevents);
DENY_RULE (io_setup);
DENY_RULE (io_submit);
DENY_RULE (ioperm);
DENY_RULE (iopl);
DENY_RULE (ioprio_set);
DENY_RULE (kcmp);
DENY_RULE (kexec_file_load);
DENY_RULE (kexec_load);
DENY_RULE (keyctl);
DENY_RULE (lookup_dcookie);
DENY_RULE (mbind);
DENY_RULE (nfsservctl);
DENY_RULE (migrate_pages);
DENY_RULE (modify_ldt);
DENY_RULE (mount);
DENY_RULE (move_pages);
DENY_RULE (name_to_handle_at);
DENY_RULE (open_by_handle_at);
DENY_RULE (perf_event_open);
DENY_RULE (pivot_root);
DENY_RULE (process_vm_readv);
DENY_RULE (process_vm_writev);
DENY_RULE (ptrace);
DENY_RULE (reboot);
DENY_RULE (remap_file_pages);
DENY_RULE (request_key);
DENY_RULE (set_mempolicy);
DENY_RULE (swapoff);
DENY_RULE (swapon);
DENY_RULE (sysfs);
DENY_RULE (syslog);
DENY_RULE (tuxcall);
DENY_RULE (umount2);
DENY_RULE (uselib);
DENY_RULE (vmsplice);
/* applying filter... */
if (seccomp_load (ctx) >= 0){
/* free ctx after the filter has been loaded into the kernel */
seccomp_release(ctx);
return 0;
}
out:
/* something went wrong */
seccomp_release(ctx);
return 1;
}
int protectedView(void){
/* prevent child processes from getting more priv e.g. via setuid, capabilities, ... */
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
perror("prctl SET_NO_NEW_PRIVS");
exit(EXIT_FAILURE);
}
/* prevent escape via ptrace */
if(prctl (PR_SET_DUMPABLE, 0, 0, 0, 0)){
perror("prctl PR_SET_DUMPABLE");
exit(EXIT_FAILURE);
}
/* initialize the filter */
ctx = seccomp_init(SCMP_ACT_KILL);
if (ctx == NULL){
perror("seccomp_init failed");
exit(EXIT_FAILURE);
}
ALLOW_RULE (access);
ALLOW_RULE (bind);
ALLOW_RULE (brk);
ALLOW_RULE (clock_getres);
ALLOW_RULE (clone);
ALLOW_RULE (close);
ALLOW_RULE (connect);
ALLOW_RULE (eventfd2);
ALLOW_RULE (exit);
ALLOW_RULE (exit_group);
ALLOW_RULE (fadvise64);
ALLOW_RULE (fallocate);
ALLOW_RULE (fcntl); /* TODO: build detailed filter */
ALLOW_RULE (fstat);
ALLOW_RULE (fstatfs);
ALLOW_RULE (ftruncate);
ALLOW_RULE (futex);
ALLOW_RULE (getdents);
ALLOW_RULE (getegid);
ALLOW_RULE (geteuid);
ALLOW_RULE (getgid);
ALLOW_RULE (getuid);
ALLOW_RULE (getpid);
ALLOW_RULE (getppid);
ALLOW_RULE (getpgrp);
ALLOW_RULE (getpeername);
ALLOW_RULE (getrandom);
ALLOW_RULE (getresgid);
ALLOW_RULE (getresuid);
ALLOW_RULE (getrlimit);
ALLOW_RULE (getsockname);
ALLOW_RULE (getsockopt); /* needed for access to x11 socket in network namespace (without abstract sockets) */
ALLOW_RULE (inotify_add_watch);
ALLOW_RULE (inotify_init1);
ALLOW_RULE (inotify_rm_watch);
/* ALLOW_RULE (ioctl); specified below */
ALLOW_RULE (lseek);
ALLOW_RULE (lstat);
ALLOW_RULE (madvise);
ALLOW_RULE (memfd_create);
ALLOW_RULE (mkdir); /* needed for first run only */
ALLOW_RULE (mmap);
ALLOW_RULE (mprotect);
ALLOW_RULE (mremap);
ALLOW_RULE (munmap);
ALLOW_RULE (open); /* (zathura needs to open for writing) TODO: avoid needing this somehow */
ALLOW_RULE (openat);
ALLOW_RULE (pipe);
ALLOW_RULE (poll);
ALLOW_RULE (pwrite64); /* TODO: build detailed filter */
ALLOW_RULE (pread64);
ALLOW_RULE (prlimit64);
ALLOW_RULE (prctl); /* NOT specified below */
ALLOW_RULE (read);
ALLOW_RULE (readlink);
ALLOW_RULE (recvfrom);
ALLOW_RULE (recvmsg);
ALLOW_RULE (restart_syscall);
ALLOW_RULE (rt_sigaction);
ALLOW_RULE (rt_sigprocmask);
ALLOW_RULE (seccomp);
ALLOW_RULE (sendmsg);
ALLOW_RULE (sendto);
ALLOW_RULE (select);
ALLOW_RULE (set_robust_list);
ALLOW_RULE (setsockopt);
ALLOW_RULE (shmat);
ALLOW_RULE (shmctl);
ALLOW_RULE (shmdt);
ALLOW_RULE (shmget);
ALLOW_RULE (shutdown);
ALLOW_RULE (stat);
ALLOW_RULE (statfs);
/* ALLOW_RULE (socket); specified below */
ALLOW_RULE (sysinfo);
ALLOW_RULE (uname);
ALLOW_RULE (unlink);
ALLOW_RULE (write); /* specified below (zathura needs to write files)*/
ALLOW_RULE (writev);
ALLOW_RULE (wait4); /* trying to open links should not crash the app */
/* allowed for use with container */
ALLOW_RULE (chmod);
ALLOW_RULE (link);
ALLOW_RULE (rename);
/* allowed for debugging: */
/* ALLOW_RULE (prctl); */
/* ALLOW_RULE (ioctl); */
/* incomplete */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(fcntl), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, F_GETFL)) < 0) */
/* goto out; */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(fcntl), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, F_SETFL)) < 0) */
/* goto out; */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(fcntl), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, F_SETFD)) < 0) */
/* goto out; */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(fcntl), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, F_GETFD)) < 0) */
/* goto out; */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(fcntl), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, F_SETLK)) < 0) */
/* goto out; */
/* Special requirements for ioctl, allowed on stdout/stderr */
if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(ioctl), 1,
SCMP_CMP(0, SCMP_CMP_EQ, 1)) < 0)
goto out;
if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(ioctl), 1,
SCMP_CMP(0, SCMP_CMP_EQ, 2)) < 0)
goto out;
/* TODO: build detailed filter for prctl */
/* needed by gtk??? (does not load content without) */
/* /\* special restrictions for prctl, only allow PR_SET_NAME/PR_SET_PDEATHSIG *\/ */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(prctl), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, PR_SET_NAME)) < 0) */
/* goto out; */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(prctl), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, PR_SET_PDEATHSIG)) < 0) */
/* goto out; */
/* when zathura is run on wayland, with X11 server available but blocked, unset the DISPLAY variable */
/* otherwise it will try to connect to X11 using inet socket protocol */
/* required changes in links.c (at girara_xdg_open) */
/* special restrictions for socket, only allow AF_UNIX/AF_LOCAL */
if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(socket), 1,
SCMP_CMP(0, SCMP_CMP_EQ, AF_UNIX)) < 0)
goto out;
if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(socket), 1,
SCMP_CMP(0, SCMP_CMP_EQ, AF_LOCAL)) < 0)
goto out;
/* TODO: avoid the need for the open syscall to be allowed with write permissions */
/* zathura needs to open files for writing to save current position */
/* /\* special restrictions for open, prevent opening files for writing *\/ */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(open), 1, */
/* SCMP_CMP(1, SCMP_CMP_MASKED_EQ, O_WRONLY | O_RDWR, 0)) < 0) */
/* goto out; */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ERRNO (EACCES), SCMP_SYS(open), 1, */
/* SCMP_CMP(1, SCMP_CMP_MASKED_EQ, O_WRONLY, O_WRONLY)) < 0) */
/* goto out; */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ERRNO (EACCES), SCMP_SYS(open), 1, */
/* SCMP_CMP(1, SCMP_CMP_MASKED_EQ, O_RDWR, O_RDWR)) < 0) */
/* goto out; */
/* ------------ experimental filters --------------- */
/* /\* this filter is susceptible to TOCTOU race conditions, providing limited use *\/ */
/* /\* allow opening only specified files identified by their file descriptors*\/ */
/* this requires either a list of all files to open (A LOT!!!) */
/* or needs to be applied only after initialisation, right before parsing */
/* if(seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(read), 1, */
/* SCMP_CMP(SCMP_CMP_EQ, fd)) < 0) /\* or < 1 ??? *\/ */
/* goto out; */
/* /\* restricting write access *\/ */
/* /\* allow stdin *\/ */
/* if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(write), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, 0)) < 0 ) */
/* goto out; */
/* /\* allow stdout *\/ */
/* if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(write), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, 1)) < 0 ) */
/* goto out; */
/* /\* allow stderr *\/ */
/* if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(write), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, 2)) < 0 ) */
/* goto out; */
/* /\* restrict writev (write a vector) access *\/ */
/* this does not seem reliable but it surprisingly is. investigate more */
/* if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(writev), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, 3)) < 0 ) */
/* goto out; */
/* test if repeating this after some time or denying it works */
/* first attempt to filter poll requests */
/* if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(poll), 1, */
/* SCMP_CMP(0, SCMP_CMP_MASKED_EQ, POLLIN | POLL, 0)) < 0) */
/* goto out; */
/* /\* restrict fcntl calls *\/ */
/* this syscall sets the file descriptor to read write */
/* if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(fcntl), 1, */
/* SCMP_CMP(0, SCMP_CMP_EQ, 3)) < 0 ) */
/* goto out; */
/* fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) */
/* fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 */
/* fcntl(3, F_SETFD, FD_CLOEXEC) = 0 */
/* ------------------ end of experimental filters ------------------ */
/* applying filter... */
if (seccomp_load (ctx) >= 0){
/* free ctx after the filter has been loaded into the kernel */
seccomp_release(ctx);
return 0;
}
out:
/* something went wrong */
seccomp_release(ctx);
return 1;
}
int strictFilter(void){
/* prevent child processes from getting more priv e.g. via setuid, capabilities, ... */
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
perror("prctl SET_NO_NEW_PRIVS");
exit(EXIT_FAILURE);
}
/* prevent escape via ptrace */
if(prctl (PR_SET_DUMPABLE, 0, 0, 0, 0)){
perror("prctl PR_SET_DUMPABLE");
exit(EXIT_FAILURE);
}
/* initialize the filter */
ctx = seccomp_init(SCMP_ACT_KILL);
if (ctx == NULL){
perror("seccomp_init failed");
exit(EXIT_FAILURE);
}
ALLOW_RULE (access);
/* ALLOW_RULE (arch_prctl); */
ALLOW_RULE (bind);
ALLOW_RULE (brk);
ALLOW_RULE (clock_getres);
ALLOW_RULE (clone);
ALLOW_RULE (close);
/* ALLOW_RULE (connect); */
ALLOW_RULE (eventfd2);
ALLOW_RULE (exit);
ALLOW_RULE (exit_group);
ALLOW_RULE (fadvise64);
ALLOW_RULE (fallocate);
ALLOW_RULE (fcntl); /* TODO: build detailed filter */
ALLOW_RULE (fstat);
ALLOW_RULE (fstatfs);
ALLOW_RULE (ftruncate);
ALLOW_RULE (futex);
ALLOW_RULE (getdents);
ALLOW_RULE (getegid);
ALLOW_RULE (geteuid);
ALLOW_RULE (getgid);
ALLOW_RULE (getuid);
ALLOW_RULE (getpid);
/* ALLOW_RULE (getpeername); */
ALLOW_RULE (getresgid);
ALLOW_RULE (getresuid);
ALLOW_RULE (getrlimit);
/* ALLOW_RULE (getsockname); */
/* ALLOW_RULE (getsockopt); needed for access to x11 socket in network namespace (without abstract sockets) */
ALLOW_RULE (inotify_add_watch);
ALLOW_RULE (inotify_init1);
ALLOW_RULE (inotify_rm_watch);
/* ALLOW_RULE (ioctl); specified below */
ALLOW_RULE (lseek);
ALLOW_RULE (lstat);
ALLOW_RULE (madvise);
ALLOW_RULE (memfd_create);
ALLOW_RULE (mkdir); /* needed for first run only */
ALLOW_RULE (mmap);
ALLOW_RULE (mprotect);
ALLOW_RULE (mremap);
ALLOW_RULE (munmap);
ALLOW_RULE (open); /* (zathura needs to open for writing) TODO: avoid needing this somehow */
ALLOW_RULE (openat);
ALLOW_RULE (pipe);
ALLOW_RULE (poll);
ALLOW_RULE (pwrite64); /* TODO: build detailed filter */
ALLOW_RULE (pread64);
/* ALLOW_RULE (prlimit64); */
/* ALLOW_RULE (prctl); specified below */
ALLOW_RULE (read);
ALLOW_RULE (readlink);
ALLOW_RULE (recvfrom);
ALLOW_RULE (recvmsg);
ALLOW_RULE (restart_syscall);
ALLOW_RULE (rt_sigaction);
ALLOW_RULE (rt_sigprocmask);
ALLOW_RULE (sendmsg);
ALLOW_RULE (sendto);
ALLOW_RULE (select);
ALLOW_RULE (set_robust_list);
/* ALLOW_RULE (set_tid_address); */
/* ALLOW_RULE (setsockopt); */
ALLOW_RULE (shmat);
ALLOW_RULE (shmctl);
ALLOW_RULE (shmdt);
ALLOW_RULE (shmget);
ALLOW_RULE (shutdown);
ALLOW_RULE (stat);
ALLOW_RULE (statfs);
/* ALLOW_RULE (socket); */
ALLOW_RULE (sysinfo);
ALLOW_RULE (uname);
ALLOW_RULE (unlink);
ALLOW_RULE (write); /* specified below (zathura needs to write files)*/
ALLOW_RULE (writev);
ALLOW_RULE (wait4); /* trying to open links should not crash the app */
/* Special requirements for ioctl, allowed on stdout/stderr */
if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(ioctl), 1,
SCMP_CMP(0, SCMP_CMP_EQ, 1)) < 0)
goto out;
if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(ioctl), 1,
SCMP_CMP(0, SCMP_CMP_EQ, 2)) < 0)
goto out;
/* needed by gtk??? (does not load content without) */
/* special restrictions for prctl, only allow PR_SET_NAME/PR_SET_PDEATHSIG */
if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(prctl), 1,
SCMP_CMP(0, SCMP_CMP_EQ, PR_SET_NAME)) < 0)
goto out;
if (seccomp_rule_add (ctx, SCMP_ACT_ALLOW, SCMP_SYS(prctl), 1,
SCMP_CMP(0, SCMP_CMP_EQ, PR_SET_PDEATHSIG)) < 0)
goto out;
/* allowed for debugging: */
/* ALLOW_RULE (prctl); */
/* ALLOW_RULE (ioctl); */
/* applying filter... */
if (seccomp_load (ctx) >= 0){
/* free ctx after the filter has been loaded into the kernel */
seccomp_release(ctx);
return 0;
}
out:
/* something went wrong */
seccomp_release(ctx);
return 1;
}
#else /* WITH_SECCOMP */
int protectedMode(void){
perror("No seccomp support compiled-in\n");
return 1;
}
int protectedView(void){
perror("No seccomp support compiled-in\n");
return 1;
}
int strictFilter(void){
perror("No seccomp support compiled-in\n");
return 1;
}
#endif /* WITH_SECCOMP */

19
zathura/libsec.h Normal file
View file

@ -0,0 +1,19 @@
#ifndef SECCOMP_H
#define SECCOMP_H
/* basic filter */
/* this mode allows normal use */
/* only dangerous syscalls are blacklisted */
int protectedMode(void);
/* secure whitelist filter */
/* whitelist minimal syscalls only */
/* this mode does not allow to open external links or to start applications */
/* network connections are prohibited as well */
int protectedView(void);
/* strict filter before document parsing */
/* this filter is to be enabled after most of the initialisation of zathura has finished */
int strictFilter(void);
#endif

9
zathura/links.c
View file

@ -14,6 +14,10 @@
#include "page.h"
#include "render.h"
#ifdef WITH_SECCOMP
#include "libsec.h"
#endif
struct zathura_link_s {
zathura_rectangle_t position; /**< Position of the link */
zathura_link_type_t type; /**< Link type */
@ -199,9 +203,14 @@ zathura_link_evaluate(zathura_t* zathura, zathura_link_t* link)
link_remote(zathura, link->target.value);
break;
case ZATHURA_LINK_URI:
#ifndef WITH_SECCOMP
if (girara_xdg_open(link->target.value) == false) {
girara_notify(zathura->ui.session, GIRARA_ERROR, _("Failed to run xdg-open."));
}
#endif
#ifdef WITH_SECCOMP
girara_notify(zathura->ui.session, GIRARA_ERROR, _("Opening external apps in protectedView Sandbox mode is not permitted"));
#endif
break;
case ZATHURA_LINK_LAUNCH:
link_launch(zathura, link);

15
zathura/main.c
View file

@ -19,6 +19,11 @@
#include "synctex.h"
#endif
#ifdef WITH_SECCOMP
#include <unistd.h>
#include "libsec.h"
#endif
/* Init locale */
static void
init_locale(void)
@ -122,6 +127,11 @@ init_zathura(const char* config_dir, const char* data_dir,
int
main(int argc, char* argv[])
{
#ifdef WITH_SECCOMP
protectedView();
#endif
init_locale();
/* parse command line arguments */
@ -288,6 +298,11 @@ main(int argc, char* argv[])
goto free_and_ret;
}
#ifdef WITH_SECCOMP
/* enforce strict syscall filter before parsing the document */
strictFilter();
#endif
/* open document if passed */
if (file_idx != 0) {
if (page_number > 0) {