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[PATCH] list module taint flags in Oops/panic

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When listing loaded modules during an oops or panic, also list each
module's Tainted flags if non-zero (P: Proprietary or F: Forced load only).

If a module is did not taint the kernel, it is just listed like
	usbcore
but if it did taint the kernel, it is listed like
	wizmodem(PF)

Example:
[ 3260.121718] Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
[ 3260.121729]  [<ffffffff8804c099>] :dump_test:proc_dump_test+0x99/0xc8
[ 3260.121742] PGD fe8d067 PUD 264a6067 PMD 0
[ 3260.121748] Oops: 0002 [1] SMP
[ 3260.121753] CPU 1
[ 3260.121756] Modules linked in: dump_test(P) snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device ide_cd generic ohci1394 snd_hda_intel snd_hda_codec snd_pcm snd_timer snd ieee1394 snd_page_alloc piix ide_core arcmsr aic79xx scsi_transport_spi usblp
[ 3260.121785] Pid: 5556, comm: bash Tainted: P      2.6.18-git10 #1

[Alternatively, I can look into listing tainted flags with 'lsmod',
but that won't help in oopsen/panics so much.]

[akpm@osdl.org: cleanup]
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Randy Dunlap 2006-10-02 02:17:02 -07:00 committed by Linus Torvalds
parent a58cbd7c24
commit 2bc2d61a96
2 changed files with 36 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/module.h
View file

@ -320,6 +320,8 @@ struct module
/* Am I GPL-compatible */
int license_gplok;
unsigned int taints; /* same bits as kernel:tainted */
#ifdef CONFIG_MODULE_UNLOAD
/* Reference counts */
struct module_ref ref[NR_CPUS];

37
kernel/module.c
View file

@ -851,6 +851,7 @@ static int check_version(Elf_Shdr *sechdrs,
printk("%s: no version for \"%s\" found: kernel tainted.\n",
mod->name, symname);
add_taint(TAINT_FORCED_MODULE);
mod->taints |= TAINT_FORCED_MODULE;
}
return 1;
}
@ -1339,6 +1340,7 @@ static void set_license(struct module *mod, const char *license)
printk(KERN_WARNING "%s: module license '%s' taints kernel.\n",
mod->name, license);
add_taint(TAINT_PROPRIETARY_MODULE);
mod->taints |= TAINT_PROPRIETARY_MODULE;
}
}
@ -1618,6 +1620,7 @@ static struct module *load_module(void __user *umod,
/* This is allowed: modprobe --force will invalidate it. */
if (!modmagic) {
add_taint(TAINT_FORCED_MODULE);
mod->taints |= TAINT_FORCED_MODULE;
printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
mod->name);
} else if (!same_magic(modmagic, vermagic)) {
@ -1711,10 +1714,14 @@ static struct module *load_module(void __user *umod,
/* Set up license info based on the info section */
set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
if (strcmp(mod->name, "ndiswrapper") == 0)
if (strcmp(mod->name, "ndiswrapper") == 0) {
add_taint(TAINT_PROPRIETARY_MODULE);
if (strcmp(mod->name, "driverloader") == 0)
mod->taints |= TAINT_PROPRIETARY_MODULE;
}
if (strcmp(mod->name, "driverloader") == 0) {
add_taint(TAINT_PROPRIETARY_MODULE);
mod->taints |= TAINT_PROPRIETARY_MODULE;
}
/* Set up MODINFO_ATTR fields */
setup_modinfo(mod, sechdrs, infoindex);
@ -1760,6 +1767,7 @@ static struct module *load_module(void __user *umod,
printk(KERN_WARNING "%s: No versions for exported symbols."
" Tainting kernel.\n", mod->name);
add_taint(TAINT_FORCED_MODULE);
mod->taints |= TAINT_FORCED_MODULE;
}
#endif
@ -2226,14 +2234,37 @@ struct module *module_text_address(unsigned long addr)
return mod;
}
static char *taint_flags(unsigned int taints, char *buf)
{
*buf = '\0';
if (taints) {
int bx;
buf[0] = '(';
bx = 1;
if (taints & TAINT_PROPRIETARY_MODULE)
buf[bx++] = 'P';
if (taints & TAINT_FORCED_MODULE)
buf[bx++] = 'F';
/*
* TAINT_FORCED_RMMOD: could be added.
* TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
* apply to modules.
*/
buf[bx] = ')';
}
return buf;
}
/* Don't grab lock, we're oopsing. */
void print_modules(void)
{
struct module *mod;
char buf[8];
printk("Modules linked in:");
list_for_each_entry(mod, &modules, list)
printk(" %s", mod->name);
printk(" %s%s", mod->name, taint_flags(mod->taints, buf));
printk("\n");
}