From 2bc2d61a9638dab670d8361e928d1a5a291173ef Mon Sep 17 00:00:00 2001 From: Randy Dunlap Date: Mon, 2 Oct 2006 02:17:02 -0700 Subject: [PATCH] [PATCH] list module taint flags in Oops/panic 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] [] :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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/module.h | 2 ++ kernel/module.c | 37 ++++++++++++++++++++++++++++++++++--- 2 files changed, 36 insertions(+), 3 deletions(-) diff --git a/include/linux/module.h b/include/linux/module.h index 2c599175c583..4b2d8091a410 100644 --- a/include/linux/module.h +++ b/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]; diff --git a/kernel/module.c b/kernel/module.c index 05625d5dc758..7c77a0a9275c 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -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"); }