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util: add extra safety check to in_initrd()

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initrds can only be on tmpfs or ramfs, so check for that
This commit is contained in:
Lennart Poettering 2012-07-10 18:46:26 +02:00
parent 36fcd77e02
commit 825c6fe5eb
2 changed files with 31 additions and 2 deletions
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12
TODO
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@ -20,6 +20,18 @@ Bugfixes:
* we pull src/core/manager.h into src/shared/src/shared/path-lookup.c which is the wrong direction
rename enum "ManagerRunningAs" to "SystemdRunningAs" and move it to shared/
* crash happens when running a service as forking and then changing it to simple and reloading.
Jul 09 18:20:57 mop systemd[1]: usbmuxd.service operation timed out. Terminating.
Jul 09 18:20:57 mop systemd[1]: Unit usbmuxd.service entered failed state.
Jul 09 18:22:24 mop systemd[1]: PID 21814 read from file /var/run/usbmuxd.pid does not exist.
Jul 09 18:22:24 mop systemd[1]: Unit usbmuxd.service entered failed state.
Jul 09 18:22:33 mop systemd[1]: Reloading.
Jul 09 18:22:37 mop systemd[1]: Assertion 's->type == SERVICE_FORKING' failed at src/core/service.c:3007, function service_sigchld_eve...Aborting.
Jul 09 18:22:37 mop systemd[1]: Caught <ABRT>, dumped core as pid 21865.
Jul 09 18:22:37 mop systemd[1]: Freezing execution.
Jul 09 18:22:37 mop [21866]: Process 21865 (systemd) dumped core.
Features:
* switch-root add extra safety check

21
src/shared/util.c
View File

@ -54,6 +54,8 @@
#include <glob.h>
#include <grp.h>
#include <sys/mman.h>
#include <sys/vfs.h>
#include <linux/magic.h>
#include "macro.h"
#include "util.h"
@ -5738,9 +5740,24 @@ bool is_valid_documentation_url(const char *url) {
bool in_initrd(void) {
static int saved = -1;
struct statfs s;
if (saved < 0)
saved = access("/etc/initrd-release", F_OK) >= 0;
if (saved >= 0)
return saved;
/* We make two checks here:
*
* 1. the flag file /etc/initrd-release must exist
* 2. the root file system must be a memory file system
*
* The second check is extra paranoia, since misdetecting an
* initrd can have bad bad consequences due the initrd
* emptying when transititioning to the main systemd.
*/
saved = access("/etc/initrd-release", F_OK) >= 0 &&
statfs("/", &s) >= 0 &&
(s.f_type == TMPFS_MAGIC || s.f_type == RAMFS_MAGIC);
return saved;
}