perf-eh_elf/util/target.c
Linus Torvalds 16c00db4bb Merge tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull AFS fixes from David Howells:
 "Here's a set of patches that fix a number of bugs in the in-kernel AFS
  client, including:

   - Fix directory locking to not use individual page locks for
     directory reading/scanning but rather to use a semaphore on the
     afs_vnode struct as the directory contents must be read in a single
     blob and data from different reads must not be mixed as the entire
     contents may be shuffled about between reads.

   - Fix address list parsing to handle port specifiers correctly.

   - Only give up callback records on a server if we actually talked to
     that server (we might not be able to access a server).

   - Fix some callback handling bugs, including refcounting,
     whole-volume callbacks and when callbacks actually get broken in
     response to a CB.CallBack op.

   - Fix some server/address rotation bugs, including giving up if we
     can't probe a server; giving up if a server says it doesn't have a
     volume, but there are more servers to try.

   - Fix the decoding of fetched statuses to be OpenAFS compatible.

   - Fix the handling of server lookups in Cache Manager ops (such as
     CB.InitCallBackState3) to use a UUID if possible and to handle no
     server being found.

   - Fix a bug in server lookup where not all addresses are compared.

   - Fix the non-encryption of calls that prevents some servers from
     being accessed (this also requires an AF_RXRPC patch that has
     already gone in through the net tree).

  There's also a patch that adds tracepoints to log Cache Manager ops
  that don't find a matching server, either by UUID or by address"

* tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Fix the non-encryption of calls
  afs: Fix CB.CallBack handling
  afs: Fix whole-volume callback handling
  afs: Fix afs_find_server search loop
  afs: Fix the handling of an unfound server in CM operations
  afs: Add a tracepoint to record callbacks from unlisted servers
  afs: Fix the handling of CB.InitCallBackState3 to find the server by UUID
  afs: Fix VNOVOL handling in address rotation
  afs: Fix AFSFetchStatus decoder to provide OpenAFS compatibility
  afs: Fix server rotation's handling of fileserver probe failure
  afs: Fix refcounting in callback registration
  afs: Fix giving up callbacks on server destruction
  afs: Fix address list parsing
  afs: Fix directory page locking
2018-05-15 10:48:36 -07:00

152 lines
3.4 KiB
C

/*
* Helper functions for handling target threads/cpus
*
* Copyright (C) 2012, LG Electronics, Namhyung Kim <namhyung.kim@lge.com>
*
* Released under the GPL v2.
*/
#include "target.h"
#include "util.h"
#include "debug.h"
#include <pwd.h>
#include <string.h>
enum target_errno target__validate(struct target *target)
{
enum target_errno ret = TARGET_ERRNO__SUCCESS;
if (target->pid)
target->tid = target->pid;
/* CPU and PID are mutually exclusive */
if (target->tid && target->cpu_list) {
target->cpu_list = NULL;
if (ret == TARGET_ERRNO__SUCCESS)
ret = TARGET_ERRNO__PID_OVERRIDE_CPU;
}
/* UID and PID are mutually exclusive */
if (target->tid && target->uid_str) {
target->uid_str = NULL;
if (ret == TARGET_ERRNO__SUCCESS)
ret = TARGET_ERRNO__PID_OVERRIDE_UID;
}
/* UID and CPU are mutually exclusive */
if (target->uid_str && target->cpu_list) {
target->cpu_list = NULL;
if (ret == TARGET_ERRNO__SUCCESS)
ret = TARGET_ERRNO__UID_OVERRIDE_CPU;
}
/* PID and SYSTEM are mutually exclusive */
if (target->tid && target->system_wide) {
target->system_wide = false;
if (ret == TARGET_ERRNO__SUCCESS)
ret = TARGET_ERRNO__PID_OVERRIDE_SYSTEM;
}
/* UID and SYSTEM are mutually exclusive */
if (target->uid_str && target->system_wide) {
target->system_wide = false;
if (ret == TARGET_ERRNO__SUCCESS)
ret = TARGET_ERRNO__UID_OVERRIDE_SYSTEM;
}
/* THREAD and SYSTEM/CPU are mutually exclusive */
if (target->per_thread && (target->system_wide || target->cpu_list)) {
target->per_thread = false;
if (ret == TARGET_ERRNO__SUCCESS)
ret = TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD;
}
return ret;
}
enum target_errno target__parse_uid(struct target *target)
{
struct passwd pwd, *result;
char buf[1024];
const char *str = target->uid_str;
target->uid = UINT_MAX;
if (str == NULL)
return TARGET_ERRNO__SUCCESS;
/* Try user name first */
getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
if (result == NULL) {
/*
* The user name not found. Maybe it's a UID number.
*/
char *endptr;
int uid = strtol(str, &endptr, 10);
if (*endptr != '\0')
return TARGET_ERRNO__INVALID_UID;
getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
if (result == NULL)
return TARGET_ERRNO__USER_NOT_FOUND;
}
target->uid = result->pw_uid;
return TARGET_ERRNO__SUCCESS;
}
/*
* This must have a same ordering as the enum target_errno.
*/
static const char *target__error_str[] = {
"PID/TID switch overriding CPU",
"PID/TID switch overriding UID",
"UID switch overriding CPU",
"PID/TID switch overriding SYSTEM",
"UID switch overriding SYSTEM",
"SYSTEM/CPU switch overriding PER-THREAD",
"Invalid User: %s",
"Problems obtaining information for user %s",
};
int target__strerror(struct target *target, int errnum,
char *buf, size_t buflen)
{
int idx;
const char *msg;
BUG_ON(buflen == 0);
if (errnum >= 0) {
str_error_r(errnum, buf, buflen);
return 0;
}
if (errnum < __TARGET_ERRNO__START || errnum >= __TARGET_ERRNO__END)
return -1;
idx = errnum - __TARGET_ERRNO__START;
msg = target__error_str[idx];
switch (errnum) {
case TARGET_ERRNO__PID_OVERRIDE_CPU ...
TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD:
snprintf(buf, buflen, "%s", msg);
break;
case TARGET_ERRNO__INVALID_UID:
case TARGET_ERRNO__USER_NOT_FOUND:
snprintf(buf, buflen, msg, target->uid_str);
break;
default:
/* cannot reach here */
break;
}
return 0;
}