From 64748a2c9062da0c32b59c1b368a86fc4613b1e1 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 21 Jan 2013 17:03:02 +1030 Subject: module: printk message when module signature fail taints kernel. Reported-by: Chris Samuel Signed-off-by: Rusty Russell --- kernel/module.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'kernel') diff --git a/kernel/module.c b/kernel/module.c index eab08274ec9b..e69a5a68766f 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -3192,8 +3192,13 @@ again: #ifdef CONFIG_MODULE_SIG mod->sig_ok = info->sig_ok; - if (!mod->sig_ok) + if (!mod->sig_ok) { + printk_once(KERN_NOTICE + "%s: module verification failed: signature and/or" + " required key missing - tainting kernel\n", + mod->name); add_taint_module(mod, TAINT_FORCED_MODULE); + } #endif /* Now module is in final location, initialize linked lists, etc. */ -- cgit v1.2.3 From 373d4d099761cb1f637bed488ab3871945882273 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 21 Jan 2013 17:17:39 +1030 Subject: taint: add explicit flag to show whether lock dep is still OK. Fix up all callers as they were before, with make one change: an unsigned module taints the kernel, but doesn't turn off lockdep. Signed-off-by: Rusty Russell --- arch/alpha/kernel/traps.c | 2 +- arch/arm/kernel/traps.c | 2 +- arch/arm64/kernel/traps.c | 2 +- arch/avr32/kernel/traps.c | 2 +- arch/hexagon/kernel/traps.c | 2 +- arch/ia64/kernel/traps.c | 2 +- arch/m68k/kernel/traps.c | 2 +- arch/mips/kernel/traps.c | 2 +- arch/parisc/kernel/traps.c | 2 +- arch/powerpc/kernel/traps.c | 2 +- arch/s390/kernel/traps.c | 2 +- arch/sh/kernel/traps.c | 2 +- arch/sparc/kernel/setup_64.c | 2 +- arch/sparc/kernel/traps_32.c | 2 +- arch/sparc/kernel/traps_64.c | 2 +- arch/unicore32/kernel/traps.c | 2 +- arch/x86/kernel/cpu/amd.c | 3 +-- arch/x86/kernel/cpu/mcheck/mce.c | 2 +- arch/x86/kernel/cpu/mcheck/p5.c | 2 +- arch/x86/kernel/cpu/mcheck/winchip.c | 2 +- arch/x86/kernel/cpu/mtrr/generic.c | 2 +- arch/x86/kernel/dumpstack.c | 2 +- arch/xtensa/kernel/traps.c | 2 +- drivers/acpi/custom_method.c | 2 +- drivers/acpi/osl.c | 2 +- drivers/base/regmap/regmap-debugfs.c | 2 +- include/linux/kernel.h | 6 +++++- kernel/module.c | 26 +++++++++++++++----------- kernel/panic.c | 34 ++++++++++++++-------------------- kernel/sched/core.c | 2 +- kernel/sysctl.c | 2 +- lib/bug.c | 3 ++- mm/memory.c | 2 +- mm/page_alloc.c | 2 +- mm/slab.c | 2 +- mm/slub.c | 2 +- sound/soc/soc-core.c | 2 +- 37 files changed, 69 insertions(+), 67 deletions(-) (limited to 'kernel') diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c index 272666d006df..4037461a6493 100644 --- a/arch/alpha/kernel/traps.c +++ b/arch/alpha/kernel/traps.c @@ -186,7 +186,7 @@ die_if_kernel(char * str, struct pt_regs *regs, long err, unsigned long *r9_15) #endif printk("%s(%d): %s %ld\n", current->comm, task_pid_nr(current), str, err); dik_show_regs(regs, r9_15); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); dik_show_trace((unsigned long *)(regs+1)); dik_show_code((unsigned int *)regs->pc); diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index b0179b89a04c..1c089119b2d7 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -296,7 +296,7 @@ static void oops_end(unsigned long flags, struct pt_regs *regs, int signr) bust_spinlocks(0); die_owner = -1; - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); die_nest_count--; if (!die_nest_count) /* Nest count reaches zero, release the lock. */ diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 3883f842434f..b3c5f628bdb4 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -242,7 +242,7 @@ void die(const char *str, struct pt_regs *regs, int err) crash_kexec(regs); bust_spinlocks(0); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); raw_spin_unlock_irq(&die_lock); oops_exit(); diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c index 3d760c06f024..682b2478691a 100644 --- a/arch/avr32/kernel/traps.c +++ b/arch/avr32/kernel/traps.c @@ -61,7 +61,7 @@ void die(const char *str, struct pt_regs *regs, long err) show_regs_log_lvl(regs, KERN_EMERG); show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG); bust_spinlocks(0); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irq(&die_lock); if (in_interrupt()) diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c index a41eeb8eeaa1..be5e2dd9c9d3 100644 --- a/arch/hexagon/kernel/traps.c +++ b/arch/hexagon/kernel/traps.c @@ -225,7 +225,7 @@ int die(const char *str, struct pt_regs *regs, long err) do_show_stack(current, ®s->r30, pt_elr(regs)); bust_spinlocks(0); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irq(&die.lock); diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c index bd42b76000d1..f7f9f9c6caf0 100644 --- a/arch/ia64/kernel/traps.c +++ b/arch/ia64/kernel/traps.c @@ -72,7 +72,7 @@ die (const char *str, struct pt_regs *regs, long err) bust_spinlocks(0); die.lock_owner = -1; - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irq(&die.lock); if (!regs) diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c index cbc624af4494..f32ab22e7ed3 100644 --- a/arch/m68k/kernel/traps.c +++ b/arch/m68k/kernel/traps.c @@ -1176,7 +1176,7 @@ void die_if_kernel (char *str, struct pt_regs *fp, int nr) console_verbose(); printk("%s: %08x\n",str,nr); show_registers(fp); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); do_exit(SIGSEGV); } diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index cf7ac5483f53..9007966d56d4 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -396,7 +396,7 @@ void __noreturn die(const char *str, struct pt_regs *regs) printk("%s[#%d]:\n", str, ++die_counter); show_registers(regs); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); raw_spin_unlock_irq(&die_lock); oops_exit(); diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c index 45ba99f5080b..aeb8f8f2c07a 100644 --- a/arch/parisc/kernel/traps.c +++ b/arch/parisc/kernel/traps.c @@ -282,7 +282,7 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err) show_regs(regs); dump_stack(); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); if (in_interrupt()) panic("Fatal exception in interrupt"); diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 32518401af68..c579db859388 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -138,7 +138,7 @@ static void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, { bust_spinlocks(0); die_owner = -1; - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); die_nest_count--; oops_exit(); printk("\n"); diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index 70ecfc5fe8f0..13dd63fba367 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -271,7 +271,7 @@ void die(struct pt_regs *regs, const char *str) print_modules(); show_regs(regs); bust_spinlocks(0); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irq(&die_lock); if (in_interrupt()) panic("Fatal exception in interrupt"); diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c index 72246bc06884..dfdad72c61ca 100644 --- a/arch/sh/kernel/traps.c +++ b/arch/sh/kernel/traps.c @@ -38,7 +38,7 @@ void die(const char *str, struct pt_regs *regs, long err) notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV); bust_spinlocks(0); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irq(&die_lock); oops_exit(); diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c index 0eaf0059aaef..88a127b9c69e 100644 --- a/arch/sparc/kernel/setup_64.c +++ b/arch/sparc/kernel/setup_64.c @@ -115,7 +115,7 @@ static void __init process_switch(char c) break; } cheetah_pcache_forced_on = 1; - add_taint(TAINT_MACHINE_CHECK); + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); cheetah_enable_pcache(); break; diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c index a5785ea2a85d..662982946a89 100644 --- a/arch/sparc/kernel/traps_32.c +++ b/arch/sparc/kernel/traps_32.c @@ -58,7 +58,7 @@ void die_if_kernel(char *str, struct pt_regs *regs) printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter); show_regs(regs); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); __SAVE; __SAVE; __SAVE; __SAVE; __SAVE; __SAVE; __SAVE; __SAVE; diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c index e7ecf1507d90..8d38ca97aa23 100644 --- a/arch/sparc/kernel/traps_64.c +++ b/arch/sparc/kernel/traps_64.c @@ -2383,7 +2383,7 @@ void die_if_kernel(char *str, struct pt_regs *regs) notify_die(DIE_OOPS, str, regs, 0, 255, SIGSEGV); __asm__ __volatile__("flushw"); show_regs(regs); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); if (regs->tstate & TSTATE_PRIV) { struct thread_info *tp = current_thread_info(); struct reg_window *rw = (struct reg_window *) diff --git a/arch/unicore32/kernel/traps.c b/arch/unicore32/kernel/traps.c index 2054f0d4db13..0870b68d2ad9 100644 --- a/arch/unicore32/kernel/traps.c +++ b/arch/unicore32/kernel/traps.c @@ -231,7 +231,7 @@ void die(const char *str, struct pt_regs *regs, int err) ret = __die(str, err, thread, regs); bust_spinlocks(0); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irq(&die_lock); oops_exit(); diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 15239fffd6fe..5853e57523e5 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -220,8 +220,7 @@ static void __cpuinit amd_k7_smp_check(struct cpuinfo_x86 *c) */ WARN_ONCE(1, "WARNING: This combination of AMD" " processors is not suitable for SMP.\n"); - if (!test_taint(TAINT_UNSAFE_SMP)) - add_taint(TAINT_UNSAFE_SMP); + add_taint(TAINT_UNSAFE_SMP, LOCKDEP_NOW_UNRELIABLE); valid_k7: ; diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index 80dbda84f1c3..6bc15edbc8cd 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -1085,7 +1085,7 @@ void do_machine_check(struct pt_regs *regs, long error_code) /* * Set taint even when machine check was not enabled. */ - add_taint(TAINT_MACHINE_CHECK); + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); severity = mce_severity(&m, cfg->tolerant, NULL); diff --git a/arch/x86/kernel/cpu/mcheck/p5.c b/arch/x86/kernel/cpu/mcheck/p5.c index 2d5454cd2c4f..1c044b1ccc59 100644 --- a/arch/x86/kernel/cpu/mcheck/p5.c +++ b/arch/x86/kernel/cpu/mcheck/p5.c @@ -33,7 +33,7 @@ static void pentium_machine_check(struct pt_regs *regs, long error_code) smp_processor_id()); } - add_taint(TAINT_MACHINE_CHECK); + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); } /* Set up machine check reporting for processors with Intel style MCE: */ diff --git a/arch/x86/kernel/cpu/mcheck/winchip.c b/arch/x86/kernel/cpu/mcheck/winchip.c index 2d7998fb628c..e9a701aecaa1 100644 --- a/arch/x86/kernel/cpu/mcheck/winchip.c +++ b/arch/x86/kernel/cpu/mcheck/winchip.c @@ -15,7 +15,7 @@ static void winchip_machine_check(struct pt_regs *regs, long error_code) { printk(KERN_EMERG "CPU0: Machine Check Exception.\n"); - add_taint(TAINT_MACHINE_CHECK); + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE); } /* Set up machine check reporting on the Winchip C6 series */ diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c index e9fe907cd249..fa72a39e5d46 100644 --- a/arch/x86/kernel/cpu/mtrr/generic.c +++ b/arch/x86/kernel/cpu/mtrr/generic.c @@ -542,7 +542,7 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base, if (tmp != mask_lo) { printk(KERN_WARNING "mtrr: your BIOS has configured an incorrect mask, fixing it.\n"); - add_taint(TAINT_FIRMWARE_WORKAROUND); + add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK); mask_lo = tmp; } } diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index ae42418bc50f..c8797d55b245 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -232,7 +232,7 @@ void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr) bust_spinlocks(0); die_owner = -1; - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); die_nest_count--; if (!die_nest_count) /* Nest count reaches zero, release the lock. */ diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 01e0111bf787..ded955d45155 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -524,7 +524,7 @@ void die(const char * str, struct pt_regs * regs, long err) if (!user_mode(regs)) show_stack(NULL, (unsigned long*)regs->areg[1]); - add_taint(TAINT_DIE); + add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irq(&die_lock); if (in_interrupt()) diff --git a/drivers/acpi/custom_method.c b/drivers/acpi/custom_method.c index 5d42c2414ae5..cd9a68e2fea9 100644 --- a/drivers/acpi/custom_method.c +++ b/drivers/acpi/custom_method.c @@ -66,7 +66,7 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf, buf = NULL; if (ACPI_FAILURE(status)) return -EINVAL; - add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); + add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); } return count; diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 3ff267861541..535e888bad78 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -661,7 +661,7 @@ static void acpi_table_taint(struct acpi_table_header *table) pr_warn(PREFIX "Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", table->signature, table->oem_table_id); - add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); + add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); } diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index 46a213a596e2..f63c830083ec 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -267,7 +267,7 @@ static ssize_t regmap_map_write_file(struct file *file, return -EINVAL; /* Userspace has been fiddling around behind the kernel's back */ - add_taint(TAINT_USER); + add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE); regmap_write(map, reg, value); return buf_size; diff --git a/include/linux/kernel.h b/include/linux/kernel.h index c566927efcbd..80d36874689b 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -398,7 +398,11 @@ extern int panic_on_unrecovered_nmi; extern int panic_on_io_nmi; extern int sysctl_panic_on_stackoverflow; extern const char *print_tainted(void); -extern void add_taint(unsigned flag); +enum lockdep_ok { + LOCKDEP_STILL_OK, + LOCKDEP_NOW_UNRELIABLE +}; +extern void add_taint(unsigned flag, enum lockdep_ok); extern int test_taint(unsigned flag); extern unsigned long get_taint(void); extern int root_mountflags; diff --git a/kernel/module.c b/kernel/module.c index e69a5a68766f..cc000dd6e4a8 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -197,9 +197,10 @@ static inline int strong_try_module_get(struct module *mod) return -ENOENT; } -static inline void add_taint_module(struct module *mod, unsigned flag) +static inline void add_taint_module(struct module *mod, unsigned flag, + enum lockdep_ok lockdep_ok) { - add_taint(flag); + add_taint(flag, lockdep_ok); mod->taints |= (1U << flag); } @@ -727,7 +728,7 @@ static inline int try_force_unload(unsigned int flags) { int ret = (flags & O_TRUNC); if (ret) - add_taint(TAINT_FORCED_RMMOD); + add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); return ret; } #else @@ -1138,7 +1139,7 @@ static int try_to_force_load(struct module *mod, const char *reason) if (!test_taint(TAINT_FORCED_MODULE)) printk(KERN_WARNING "%s: %s: kernel tainted.\n", mod->name, reason); - add_taint_module(mod, TAINT_FORCED_MODULE); + add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); return 0; #else return -ENOEXEC; @@ -2147,7 +2148,8 @@ static void set_license(struct module *mod, const char *license) if (!test_taint(TAINT_PROPRIETARY_MODULE)) printk(KERN_WARNING "%s: module license '%s' taints " "kernel.\n", mod->name, license); - add_taint_module(mod, TAINT_PROPRIETARY_MODULE); + add_taint_module(mod, TAINT_PROPRIETARY_MODULE, + LOCKDEP_NOW_UNRELIABLE); } } @@ -2700,10 +2702,10 @@ static int check_modinfo(struct module *mod, struct load_info *info, int flags) } if (!get_modinfo(info, "intree")) - add_taint_module(mod, TAINT_OOT_MODULE); + add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); if (get_modinfo(info, "staging")) { - add_taint_module(mod, TAINT_CRAP); + add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); printk(KERN_WARNING "%s: module is from the staging directory," " the quality is unknown, you have been warned.\n", mod->name); @@ -2869,15 +2871,17 @@ static int check_module_license_and_versions(struct module *mod) * using GPL-only symbols it needs. */ if (strcmp(mod->name, "ndiswrapper") == 0) - add_taint(TAINT_PROPRIETARY_MODULE); + add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); /* driverloader was caught wrongly pretending to be under GPL */ if (strcmp(mod->name, "driverloader") == 0) - add_taint_module(mod, TAINT_PROPRIETARY_MODULE); + add_taint_module(mod, TAINT_PROPRIETARY_MODULE, + LOCKDEP_NOW_UNRELIABLE); /* lve claims to be GPL but upstream won't provide source */ if (strcmp(mod->name, "lve") == 0) - add_taint_module(mod, TAINT_PROPRIETARY_MODULE); + add_taint_module(mod, TAINT_PROPRIETARY_MODULE, + LOCKDEP_NOW_UNRELIABLE); #ifdef CONFIG_MODVERSIONS if ((mod->num_syms && !mod->crcs) @@ -3197,7 +3201,7 @@ again: "%s: module verification failed: signature and/or" " required key missing - tainting kernel\n", mod->name); - add_taint_module(mod, TAINT_FORCED_MODULE); + add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_STILL_OK); } #endif diff --git a/kernel/panic.c b/kernel/panic.c index e1b2822fff97..7c57cc9eee2c 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -259,26 +259,19 @@ unsigned long get_taint(void) return tainted_mask; } -void add_taint(unsigned flag) +/** + * add_taint: add a taint flag if not already set. + * @flag: one of the TAINT_* constants. + * @lockdep_ok: whether lock debugging is still OK. + * + * If something bad has gone wrong, you'll want @lockdebug_ok = false, but for + * some notewortht-but-not-corrupting cases, it can be set to true. + */ +void add_taint(unsigned flag, enum lockdep_ok lockdep_ok) { - /* - * Can't trust the integrity of the kernel anymore. - * We don't call directly debug_locks_off() because the issue - * is not necessarily serious enough to set oops_in_progress to 1 - * Also we want to keep up lockdep for staging/out-of-tree - * development and post-warning case. - */ - switch (flag) { - case TAINT_CRAP: - case TAINT_OOT_MODULE: - case TAINT_WARN: - case TAINT_FIRMWARE_WORKAROUND: - break; - - default: - if (__debug_locks_off()) - printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n"); - } + if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off()) + printk(KERN_WARNING + "Disabling lock debugging due to kernel taint\n"); set_bit(flag, &tainted_mask); } @@ -421,7 +414,8 @@ static void warn_slowpath_common(const char *file, int line, void *caller, print_modules(); dump_stack(); print_oops_end_marker(); - add_taint(taint); + /* Just a warning, don't kill lockdep. */ + add_taint(taint, LOCKDEP_STILL_OK); } void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 257002c13bb0..662f3d512183 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2785,7 +2785,7 @@ static noinline void __schedule_bug(struct task_struct *prev) if (irqs_disabled()) print_irqtrace_events(prev); dump_stack(); - add_taint(TAINT_WARN); + add_taint(TAINT_WARN, LOCKDEP_STILL_OK); } /* diff --git a/kernel/sysctl.c b/kernel/sysctl.c index c88878db491e..f97f9d75cde8 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2006,7 +2006,7 @@ static int proc_taint(struct ctl_table *table, int write, int i; for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { if ((tmptaint >> i) & 1) - add_taint(i); + add_taint(i, LOCKDEP_STILL_OK); } } diff --git a/lib/bug.c b/lib/bug.c index d0cdf14c651a..168603477f02 100644 --- a/lib/bug.c +++ b/lib/bug.c @@ -166,7 +166,8 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs) print_modules(); show_regs(regs); print_oops_end_marker(); - add_taint(BUG_GET_TAINT(bug)); + /* Just a warning, don't kill lockdep. */ + add_taint(BUG_GET_TAINT(bug), LOCKDEP_STILL_OK); return BUG_TRAP_TYPE_WARN; } diff --git a/mm/memory.c b/mm/memory.c index bb1369f7b9b4..bc8bec762db7 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -716,7 +716,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr, print_symbol(KERN_ALERT "vma->vm_file->f_op->mmap: %s\n", (unsigned long)vma->vm_file->f_op->mmap); dump_stack(); - add_taint(TAINT_BAD_PAGE); + add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); } static inline bool is_cow_mapping(vm_flags_t flags) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index df2022ff0c8a..4c99cb7e276a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -320,7 +320,7 @@ static void bad_page(struct page *page) out: /* Leave bad fields for debug, except PageBuddy could make trouble */ reset_page_mapcount(page); /* remove PageBuddy */ - add_taint(TAINT_BAD_PAGE); + add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); } /* diff --git a/mm/slab.c b/mm/slab.c index e7667a3584bc..856e4a192d25 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -812,7 +812,7 @@ static void __slab_error(const char *function, struct kmem_cache *cachep, printk(KERN_ERR "slab error in %s(): cache `%s': %s\n", function, cachep->name, msg); dump_stack(); - add_taint(TAINT_BAD_PAGE); + add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); } #endif diff --git a/mm/slub.c b/mm/slub.c index ba2ca53f6c3a..7ec3041bdd0d 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -562,7 +562,7 @@ static void slab_bug(struct kmem_cache *s, char *fmt, ...) printk(KERN_ERR "----------------------------------------" "-------------------------------------\n\n"); - add_taint(TAINT_BAD_PAGE); + add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); } static void slab_fix(struct kmem_cache *s, char *fmt, ...) diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 2370063b5824..4c6526c0db03 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -251,7 +251,7 @@ static ssize_t codec_reg_write_file(struct file *file, return -EINVAL; /* Userspace has been fiddling around behind the kernel's back */ - add_taint(TAINT_USER); + add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE); snd_soc_write(codec, reg, value); return buf_size; -- cgit v1.2.3 From a3535c7e4f4495fe947f7901d25447d80e04fe52 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 21 Jan 2013 17:18:59 +1030 Subject: module: clean up load_module a little more. 1fb9341ac34825aa40354e74d9a2c69df7d2c304 made our locking in load_module more complicated: we grab the mutex once to insert the module in the list, then again to upgrade it once it's formed. Since the locking is self-contained, it's neater to do this in separate functions. Signed-off-by: Rusty Russell --- kernel/module.c | 107 +++++++++++++++++++++++++++++++++++--------------------- 1 file changed, 68 insertions(+), 39 deletions(-) (limited to 'kernel') diff --git a/kernel/module.c b/kernel/module.c index cc000dd6e4a8..921bed4794e9 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -3145,12 +3145,72 @@ static int may_init_module(void) return 0; } +/* + * We try to place it in the list now to make sure it's unique before + * we dedicate too many resources. In particular, temporary percpu + * memory exhaustion. + */ +static int add_unformed_module(struct module *mod) +{ + int err; + struct module *old; + + mod->state = MODULE_STATE_UNFORMED; + +again: + mutex_lock(&module_mutex); + if ((old = find_module_all(mod->name, true)) != NULL) { + if (old->state == MODULE_STATE_COMING + || old->state == MODULE_STATE_UNFORMED) { + /* Wait in case it fails to load. */ + mutex_unlock(&module_mutex); + err = wait_event_interruptible(module_wq, + finished_loading(mod->name)); + if (err) + goto out_unlocked; + goto again; + } + err = -EEXIST; + goto out; + } + list_add_rcu(&mod->list, &modules); + err = 0; + +out: + mutex_unlock(&module_mutex); +out_unlocked: + return err; +} + +static int complete_formation(struct module *mod, struct load_info *info) +{ + int err; + + mutex_lock(&module_mutex); + + /* Find duplicate symbols (must be called under lock). */ + err = verify_export_symbols(mod); + if (err < 0) + goto out; + + /* This relies on module_mutex for list integrity. */ + module_bug_finalize(info->hdr, info->sechdrs, mod); + + /* Mark state as coming so strong_try_module_get() ignores us, + * but kallsyms etc. can see us. */ + mod->state = MODULE_STATE_COMING; + +out: + mutex_unlock(&module_mutex); + return err; +} + /* Allocate and load the module: note that size of section 0 is always zero, and we rely on this for optional sections. */ static int load_module(struct load_info *info, const char __user *uargs, int flags) { - struct module *mod, *old; + struct module *mod; long err; err = module_sig_check(info); @@ -3168,31 +3228,10 @@ static int load_module(struct load_info *info, const char __user *uargs, goto free_copy; } - /* - * We try to place it in the list now to make sure it's unique - * before we dedicate too many resources. In particular, - * temporary percpu memory exhaustion. - */ - mod->state = MODULE_STATE_UNFORMED; -again: - mutex_lock(&module_mutex); - if ((old = find_module_all(mod->name, true)) != NULL) { - if (old->state == MODULE_STATE_COMING - || old->state == MODULE_STATE_UNFORMED) { - /* Wait in case it fails to load. */ - mutex_unlock(&module_mutex); - err = wait_event_interruptible(module_wq, - finished_loading(mod->name)); - if (err) - goto free_module; - goto again; - } - err = -EEXIST; - mutex_unlock(&module_mutex); + /* Reserve our place in the list. */ + err = add_unformed_module(mod); + if (err) goto free_module; - } - list_add_rcu(&mod->list, &modules); - mutex_unlock(&module_mutex); #ifdef CONFIG_MODULE_SIG mod->sig_ok = info->sig_ok; @@ -3245,21 +3284,11 @@ again: dynamic_debug_setup(info->debug, info->num_debug); - mutex_lock(&module_mutex); - /* Find duplicate symbols (must be called under lock). */ - err = verify_export_symbols(mod); - if (err < 0) + /* Finally it's fully formed, ready to start executing. */ + err = complete_formation(mod, info); + if (err) goto ddebug_cleanup; - /* This relies on module_mutex for list integrity. */ - module_bug_finalize(info->hdr, info->sechdrs, mod); - - /* Mark state as coming so strong_try_module_get() ignores us, - * but kallsyms etc. can see us. */ - mod->state = MODULE_STATE_COMING; - - mutex_unlock(&module_mutex); - /* Module is ready to execute: parsing args may do that. */ err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, -32768, 32767, &ddebug_dyndbg_module_param_cb); @@ -3283,8 +3312,8 @@ again: /* module_bug_cleanup needs module_mutex protection */ mutex_lock(&module_mutex); module_bug_cleanup(mod); - ddebug_cleanup: mutex_unlock(&module_mutex); + ddebug_cleanup: dynamic_debug_remove(info->debug); synchronize_sched(); kfree(mod->args); -- cgit v1.2.3 From 227536740e5cb157fb9fa9b381178c7d34b95d3b Mon Sep 17 00:00:00 2001 From: Michal Marek Date: Fri, 25 Jan 2013 13:41:00 +1030 Subject: MODSIGN: Simplify Makefile with a Kconfig helper Signed-off-by: Michal Marek Acked-by: David Howells Signed-off-by: Rusty Russell --- init/Kconfig | 9 +++++++++ kernel/Makefile | 22 +++------------------- 2 files changed, 12 insertions(+), 19 deletions(-) (limited to 'kernel') diff --git a/init/Kconfig b/init/Kconfig index be8b7f55312d..fff4cb1321c5 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1697,6 +1697,15 @@ config MODULE_SIG_SHA512 endchoice +config MODULE_SIG_HASH + string + depends on MODULE_SIG + default "sha1" if MODULE_SIG_SHA1 + default "sha224" if MODULE_SIG_SHA224 + default "sha256" if MODULE_SIG_SHA256 + default "sha384" if MODULE_SIG_SHA384 + default "sha512" if MODULE_SIG_SHA512 + endif # MODULES config INIT_ALL_POSSIBLE diff --git a/kernel/Makefile b/kernel/Makefile index 6c072b6da239..eceac38f3c65 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -153,23 +153,7 @@ kernel/modsign_certificate.o: signing_key.x509 extra_certificates # fail and that the kernel may be used afterwards. # ############################################################################### -sign_key_with_hash := -ifeq ($(CONFIG_MODULE_SIG_SHA1),y) -sign_key_with_hash := -sha1 -endif -ifeq ($(CONFIG_MODULE_SIG_SHA224),y) -sign_key_with_hash := -sha224 -endif -ifeq ($(CONFIG_MODULE_SIG_SHA256),y) -sign_key_with_hash := -sha256 -endif -ifeq ($(CONFIG_MODULE_SIG_SHA384),y) -sign_key_with_hash := -sha384 -endif -ifeq ($(CONFIG_MODULE_SIG_SHA512),y) -sign_key_with_hash := -sha512 -endif -ifeq ($(sign_key_with_hash),) +ifndef CONFIG_MODULE_SIG_HASH $(error Could not determine digest type to use from kernel config) endif @@ -182,8 +166,8 @@ signing_key.priv signing_key.x509: x509.genkey @echo "### needs to be run as root, and uses a hardware random" @echo "### number generator if one is available." @echo "###" - openssl req -new -nodes -utf8 $(sign_key_with_hash) -days 36500 -batch \ - -x509 -config x509.genkey \ + openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ + -batch -x509 -config x509.genkey \ -outform DER -out signing_key.x509 \ -keyout signing_key.priv @echo "###" -- cgit v1.2.3