From: Randy Dunlap <[email protected]>
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.]
Signed-off-by: Randy Dunlap <[email protected]>
---
include/linux/module.h | 2 ++
kernel/module.c | 36 +++++++++++++++++++++++++++++++++---
2 files changed, 35 insertions(+), 3 deletions(-)
--- linux-2618-g10.orig/include/linux/module.h
+++ linux-2618-g10/include/linux/module.h
@@ -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];
--- linux-2618-g10.orig/kernel/module.c
+++ linux-2618-g10/kernel/module.c
@@ -851,6 +851,7 @@ static int check_version(Elf_Shdr *sechd
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;
}
@@ -1325,6 +1326,7 @@ static void set_license(struct module *m
printk(KERN_WARNING "%s: module license '%s' taints kernel.\n",
mod->name, license);
add_taint(TAINT_PROPRIETARY_MODULE);
+ mod->taints |= TAINT_PROPRIETARY_MODULE;
}
}
@@ -1604,6 +1606,7 @@ static struct module *load_module(void _
/* 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)) {
@@ -1697,10 +1700,14 @@ static struct module *load_module(void _
/* 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);
@@ -1746,6 +1753,7 @@ static struct module *load_module(void _
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
@@ -2212,6 +2220,28 @@ struct module *module_text_address(unsig
return mod;
}
+static char *taint_flags(unsigned int taints)
+{
+ static char buf[8];
+ int bx;
+
+ if (!taints)
+ return "";
+
+ 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)
{
@@ -2219,7 +2249,7 @@ void print_modules(void)
printk("Modules linked in:");
list_for_each_entry(mod, &modules, list)
- printk(" %s", mod->name);
+ printk(" %s%s", mod->name, taint_flags(mod->taints));
printk("\n");
}
---
-
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