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/*
* libpulp - User-space Livepatching Library
*
* Copyright (C) 2017-2021 SUSE Software Solutions GmbH
*
* This file is part of libpulp.
*
* libpulp is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* libpulp is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with libpulp. If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <link.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/user.h>
#include <argp.h>
#include "arguments.h"
#include "check.h"
#include "config.h"
#include "error_common.h"
#include "introspection.h"
#include "ulp_common.h"
extern struct ulp_metadata ulp;
int
run_check(struct arguments *arguments)
{
const char *container;
char *livepatch;
size_t livepatch_size;
int ret;
int check;
int result;
struct ulp_process *target = calloc(1, sizeof(struct ulp_process));
/* Set the verbosity level in the common introspection infrastructure. */
ulp_verbose = arguments->verbose;
ulp_quiet = arguments->quiet;
container = arguments->args[0];
livepatch_size =
extract_ulp_from_so_to_mem(container, false, &livepatch, NULL);
if (!livepatch) {
WARN("error extracting .ulp section from %s", container);
ret = 1;
goto ulp_process_clean;
}
if (load_patch_info_from_mem(livepatch, livepatch_size)) {
WARN("error parsing the metadata file (%s).", livepatch);
ret = 1;
goto ulp_process_clean;
}
if (isnumber(arguments->process_wildcard)) {
target->pid = atoi(arguments->process_wildcard);
}
else {
WARN("check does not support process wildcard");
ret = -1;
goto ulp_process_clean;
}
ret = initialize_data_structures(target);
if (ret) {
WARN("error gathering target process information.");
ret = -1;
goto ulp_process_clean;
}
if (check_patch_sanity(target, NULL)) {
WARN("error checking live patch sanity.");
ret = -1;
goto ulp_process_clean;
}
ret = hijack_threads(target);
if (ret == ETHRDDETTACH) {
FATAL("fatal error during live patch application (hijacking).");
ret = -1;
goto ulp_process_clean;
}
if (ret > 0) {
WARN("unable to hijack process.");
ret = -1;
goto ulp_process_clean;
}
check = patch_applied(target, ulp.patch_id, &result);
if (check == -1) {
FATAL("fatal error during live patch status check (hijacked execution).");
}
else if (check) {
WARN("error during live patch status check (hijacked execution).");
}
ret = restore_threads(target);
if (ret) {
FATAL("fatal error during live patch application (restoring).");
ret = -1;
goto ulp_process_clean;
}
/*
* When patch_applied returns an error, signal the parent with -1.
* Otherwise, forward the result of the check routine, i.e. 0 if the
* patch has been previously applied, or 1 if it hasn't.
*/
if (check) {
ret = -1;
goto ulp_process_clean;
}
if (result == 0)
WARN("patch not yet applied");
else
WARN("patch already applied");
ret = result;
ulp_process_clean:
free(livepatch);
release_ulp_process(target);
return ret;
}
struct argp_option *
get_command_option_check(void)
{
static struct argp_option options[] = {
{ 0, 0, 0, 0, "Options:", 0 },
{ "verbose", 'v', 0, 0, "Produce verbose output", 0 },
{ "quiet", 'q', 0, 0, "Don't produce any output", 0 },
{ "process", 'p', "process", 0, "Target process name, wildcard, or PID", 0 },
{ 0 }
};
return options;
}
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