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kern_linker: Handle module-loading failures in preloaded .ko files

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The runtime kernel loader, linker_load_file, unloads kernel files that
failed to load all of their modules. For consistency, treat preloaded
(loader.conf loaded) kernel files in the same way.

Reviewed by:	kib
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D8200
This commit is contained in:
Conrad Meyer 2016-10-13 02:06:23 +00:00
parent d119e0f7fb
commit d9ce8a41ea
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=307163
2 changed files with 38 additions and 1 deletions
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38
sys/kern/kern_linker.c
View File

@ -1599,7 +1599,6 @@ linker_preload(void *arg)
if (error)
panic("cannot add dependency");
}
lf->userrefs++; /* so we can (try to) kldunload it */
error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
&stop, NULL);
if (!error) {
@ -1637,6 +1636,8 @@ linker_preload(void *arg)
goto fail;
}
linker_file_register_modules(lf);
if (!TAILQ_EMPTY(&lf->modules))
lf->flags |= LINKER_FILE_MODULES;
if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
&si_stop, NULL) == 0)
sysinit_add(si_start, si_stop);
@ -1653,6 +1654,41 @@ linker_preload(void *arg)
SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0);
/*
* Handle preload files that failed to load any modules.
*/
static void
linker_preload_finish(void *arg)
{
linker_file_t lf, nlf;
sx_xlock(&kld_sx);
TAILQ_FOREACH_SAFE(lf, &linker_files, link, nlf) {
/*
* If all of the modules in this file failed to load, unload
* the file and return an error of ENOEXEC. (Parity with
* linker_load_file.)
*/
if ((lf->flags & LINKER_FILE_MODULES) != 0 &&
TAILQ_EMPTY(&lf->modules)) {
linker_file_unload(lf, LINKER_UNLOAD_FORCE);
continue;
}
lf->flags &= ~LINKER_FILE_MODULES;
lf->userrefs++; /* so we can (try to) kldunload it */
}
sx_xunlock(&kld_sx);
}
/*
* Attempt to run after all DECLARE_MODULE SYSINITs. Unfortunately they can be
* scheduled at any subsystem and order, so run this as late as possible. init
* becomes runnable in SI_SUB_KTHREAD_INIT, so go slightly before that.
*/
SYSINIT(preload_finish, SI_SUB_KTHREAD_INIT - 100, SI_ORDER_MIDDLE,
linker_preload_finish, 0);
/*
* Search for a not-loaded module by name.
*

1
sys/sys/linker.h
View File

@ -73,6 +73,7 @@ struct linker_file {
int userrefs; /* kldload(2) count */
int flags;
#define LINKER_FILE_LINKED 0x1 /* file has been fully linked */
#define LINKER_FILE_MODULES 0x2 /* file has >0 modules at preload */
TAILQ_ENTRY(linker_file) link; /* list of all loaded files */
char* filename; /* file which was loaded */
char* pathname; /* file name with full path */