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authorAndy Lutomirski <luto@amacapital.net>2014-12-10 15:52:19 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:12 -0800
commit6ef4536e2f19c4dba3637413d73ea00b19764bc0 (patch)
treee286e65b4ba1ce1089a7dc87cf642cfb6fdbbe6b /init/main.c
parent52f5592e549c013feb9bb71cab3e6fd624633577 (diff)
init: allow CONFIG_INIT_FALLBACK=n to disable defaults if init= fails
If a user puts init=/whatever on the command line and /whatever can't be run, then the kernel will try a few default options before giving up. If init=/whatever came from a bootloader prompt, then this is unexpected but probably harmless. On the other hand, if it comes from a script (e.g. a tool like virtme or perhaps a future kselftest script), then the fallbacks are likely to exist, but they'll do the wrong thing. For example, they might unexpectedly invoke systemd. This adds a config option CONFIG_INIT_FALLBACK. If unset, then a failure to run the specified init= process be fatal. The tentative plan is to remove CONFIG_INIT_FALLBACK for 3.20. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Andy Lutomirski <luto@amacapital.net> Cc: Rob Landley <rob@landley.net> Cc: Chuck Ebbert <cebbert.lkml@gmail.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Shuah Khan <shuah.kh@samsung.com> Cc: Frank Rowand <frowand.list@gmail.com> Cc: Josh Triplett <josh@joshtriplett.org> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init/main.c')
-rw-r--r--init/main.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/init/main.c b/init/main.c
index d2e4ead4891f..ca380ec685de 100644
--- a/init/main.c
+++ b/init/main.c
@@ -952,8 +952,13 @@ static int __ref kernel_init(void *unused)
ret = run_init_process(execute_command);
if (!ret)
return 0;
+#ifndef CONFIG_INIT_FALLBACK
+ panic("Requested init %s failed (error %d).",
+ execute_command, ret);
+#else
pr_err("Failed to execute %s (error %d). Attempting defaults...\n",
- execute_command, ret);
+ execute_command, ret);
+#endif
}
if (!try_to_run_init_process("/sbin/init") ||
!try_to_run_init_process("/etc/init") ||