2010-11-16 05:37:37 +08:00
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#ifndef __KERNEL_PRINTK__
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#define __KERNEL_PRINTK__
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2011-05-25 08:13:20 +08:00
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#include <linux/init.h>
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2010-11-16 05:37:37 +08:00
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extern const char linux_banner[];
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extern const char linux_proc_banner[];
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2011-01-13 08:59:45 +08:00
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#define KERN_EMERG "<0>" /* system is unusable */
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#define KERN_ALERT "<1>" /* action must be taken immediately */
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#define KERN_CRIT "<2>" /* critical conditions */
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#define KERN_ERR "<3>" /* error conditions */
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#define KERN_WARNING "<4>" /* warning conditions */
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#define KERN_NOTICE "<5>" /* normal but significant condition */
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#define KERN_INFO "<6>" /* informational */
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#define KERN_DEBUG "<7>" /* debug-level messages */
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2010-11-16 05:37:37 +08:00
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/* Use the default kernel loglevel */
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#define KERN_DEFAULT "<d>"
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/*
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* Annotation for a "continued" line of log printout (only done after a
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* line that had no enclosing \n). Only to be used by core/arch code
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* during early bootup (a continued line is not SMP-safe otherwise).
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*/
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2011-01-13 08:59:45 +08:00
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#define KERN_CONT "<c>"
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2010-11-16 05:37:37 +08:00
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extern int console_printk[];
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#define console_loglevel (console_printk[0])
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#define default_message_loglevel (console_printk[1])
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#define minimum_console_loglevel (console_printk[2])
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#define default_console_loglevel (console_printk[3])
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2011-01-13 08:59:43 +08:00
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static inline void console_silent(void)
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{
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console_loglevel = 0;
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}
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static inline void console_verbose(void)
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{
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if (console_loglevel)
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console_loglevel = 15;
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}
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2010-11-16 05:37:37 +08:00
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struct va_format {
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const char *fmt;
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va_list *va;
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};
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/*
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* FW_BUG
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* Add this to a message where you are sure the firmware is buggy or behaves
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* really stupid or out of spec. Be aware that the responsible BIOS developer
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* should be able to fix this issue or at least get a concrete idea of the
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* problem by reading your message without the need of looking at the kernel
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* code.
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*
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* Use it for definite and high priority BIOS bugs.
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*
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* FW_WARN
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* Use it for not that clear (e.g. could the kernel messed up things already?)
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* and medium priority BIOS bugs.
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*
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* FW_INFO
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* Use this one if you want to tell the user or vendor about something
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* suspicious, but generally harmless related to the firmware.
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*
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* Use it for information or very low priority BIOS bugs.
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*/
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#define FW_BUG "[Firmware Bug]: "
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#define FW_WARN "[Firmware Warn]: "
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#define FW_INFO "[Firmware Info]: "
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/*
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* HW_ERR
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* Add this to a message for hardware errors, so that user can report
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* it to hardware vendor instead of LKML or software vendor.
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*/
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#define HW_ERR "[Hardware Error]: "
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2011-01-13 08:59:45 +08:00
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/*
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* Dummy printk for disabled debugging statements to use whilst maintaining
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* gcc's format and side-effect checking.
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*/
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static inline __attribute__ ((format (printf, 1, 2)))
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int no_printk(const char *fmt, ...)
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{
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return 0;
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}
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extern asmlinkage __attribute__ ((format (printf, 1, 2)))
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void early_printk(const char *fmt, ...);
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extern int printk_needs_cpu(int cpu);
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extern void printk_tick(void);
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2010-11-16 05:37:37 +08:00
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#ifdef CONFIG_PRINTK
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2011-01-13 08:59:45 +08:00
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asmlinkage __attribute__ ((format (printf, 1, 0)))
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int vprintk(const char *fmt, va_list args);
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asmlinkage __attribute__ ((format (printf, 1, 2))) __cold
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int printk(const char *fmt, ...);
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2010-11-16 05:37:37 +08:00
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/*
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* Please don't use printk_ratelimit(), because it shares ratelimiting state
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* with all other unrelated printk_ratelimit() callsites. Instead use
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* printk_ratelimited() or plain old __ratelimit().
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*/
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extern int __printk_ratelimit(const char *func);
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#define printk_ratelimit() __printk_ratelimit(__func__)
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extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
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unsigned int interval_msec);
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extern int printk_delay_msec;
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extern int dmesg_restrict;
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kptr_restrict for hiding kernel pointers from unprivileged users
Add the %pK printk format specifier and the /proc/sys/kernel/kptr_restrict
sysctl.
The %pK format specifier is designed to hide exposed kernel pointers,
specifically via /proc interfaces. Exposing these pointers provides an
easy target for kernel write vulnerabilities, since they reveal the
locations of writable structures containing easily triggerable function
pointers. The behavior of %pK depends on the kptr_restrict sysctl.
If kptr_restrict is set to 0, no deviation from the standard %p behavior
occurs. If kptr_restrict is set to 1, the default, if the current user
(intended to be a reader via seq_printf(), etc.) does not have CAP_SYSLOG
(currently in the LSM tree), kernel pointers using %pK are printed as 0's.
If kptr_restrict is set to 2, kernel pointers using %pK are printed as
0's regardless of privileges. Replacing with 0's was chosen over the
default "(null)", which cannot be parsed by userland %p, which expects
"(nil)".
[akpm@linux-foundation.org: check for IRQ context when !kptr_restrict, save an indent level, s/WARN/WARN_ONCE/]
[akpm@linux-foundation.org: coding-style fixup]
[randy.dunlap@oracle.com: fix kernel/sysctl.c warning]
Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: James Morris <jmorris@namei.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Thomas Graf <tgraf@infradead.org>
Cc: Eugene Teo <eugeneteo@kernel.org>
Cc: Kees Cook <kees.cook@canonical.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David S. Miller <davem@davemloft.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Eric Paris <eparis@parisplace.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-13 08:59:41 +08:00
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extern int kptr_restrict;
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2010-11-16 05:37:37 +08:00
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void log_buf_kexec_setup(void);
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2011-05-25 08:13:20 +08:00
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void __init setup_log_buf(int early);
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2010-11-16 05:37:37 +08:00
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#else
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2011-01-13 08:59:45 +08:00
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static inline __attribute__ ((format (printf, 1, 0)))
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int vprintk(const char *s, va_list args)
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{
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return 0;
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}
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static inline __attribute__ ((format (printf, 1, 2))) __cold
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int printk(const char *s, ...)
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{
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return 0;
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}
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static inline int printk_ratelimit(void)
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{
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return 0;
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}
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static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
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unsigned int interval_msec)
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{
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return false;
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}
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2010-11-16 05:37:37 +08:00
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static inline void log_buf_kexec_setup(void)
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{
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}
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2011-05-25 08:13:20 +08:00
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static inline void setup_log_buf(int early)
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{
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}
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2010-11-16 05:37:37 +08:00
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#endif
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extern void dump_stack(void) __cold;
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#ifndef pr_fmt
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#define pr_fmt(fmt) fmt
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#endif
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#define pr_emerg(fmt, ...) \
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2011-01-13 08:59:48 +08:00
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printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#define pr_alert(fmt, ...) \
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2011-01-13 08:59:48 +08:00
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printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#define pr_crit(fmt, ...) \
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2011-01-13 08:59:48 +08:00
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printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#define pr_err(fmt, ...) \
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2011-01-13 08:59:48 +08:00
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printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#define pr_warning(fmt, ...) \
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2011-01-13 08:59:48 +08:00
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printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#define pr_warn pr_warning
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#define pr_notice(fmt, ...) \
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2011-01-13 08:59:48 +08:00
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printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#define pr_info(fmt, ...) \
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2011-01-13 08:59:48 +08:00
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printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#define pr_cont(fmt, ...) \
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printk(KERN_CONT fmt, ##__VA_ARGS__)
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/* pr_devel() should produce zero code unless DEBUG is defined */
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#ifdef DEBUG
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#define pr_devel(fmt, ...) \
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printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_devel(fmt, ...) \
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2011-01-13 08:59:45 +08:00
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#endif
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/* If you are writing a driver, please use dev_dbg instead */
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#if defined(DEBUG)
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#define pr_debug(fmt, ...) \
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printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#elif defined(CONFIG_DYNAMIC_DEBUG)
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/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
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#define pr_debug(fmt, ...) \
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dynamic_pr_debug(fmt, ##__VA_ARGS__)
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#else
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#define pr_debug(fmt, ...) \
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2011-01-13 08:59:45 +08:00
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#endif
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2011-01-13 08:59:46 +08:00
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/*
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* Print a one-time message (analogous to WARN_ONCE() et al):
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*/
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#ifdef CONFIG_PRINTK
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#define printk_once(fmt, ...) \
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({ \
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static bool __print_once; \
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\
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if (!__print_once) { \
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__print_once = true; \
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printk(fmt, ##__VA_ARGS__); \
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} \
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})
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#else
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#define printk_once(fmt, ...) \
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no_printk(fmt, ##__VA_ARGS__)
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#endif
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#define pr_emerg_once(fmt, ...) \
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printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_alert_once(fmt, ...) \
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printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_crit_once(fmt, ...) \
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printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_err_once(fmt, ...) \
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printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_warn_once(fmt, ...) \
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printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_notice_once(fmt, ...) \
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printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_info_once(fmt, ...) \
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printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_cont_once(fmt, ...) \
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printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)
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/* If you are writing a driver, please use dev_dbg instead */
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#if defined(DEBUG)
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#define pr_debug_once(fmt, ...) \
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printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_debug_once(fmt, ...) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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2010-11-16 05:37:37 +08:00
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/*
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* ratelimited messages with local ratelimit_state,
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* no local ratelimit_state used in the !PRINTK case
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*/
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#ifdef CONFIG_PRINTK
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2011-01-13 08:59:47 +08:00
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#define printk_ratelimited(fmt, ...) \
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({ \
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2010-11-16 05:37:37 +08:00
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static DEFINE_RATELIMIT_STATE(_rs, \
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DEFAULT_RATELIMIT_INTERVAL, \
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DEFAULT_RATELIMIT_BURST); \
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\
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if (__ratelimit(&_rs)) \
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printk(fmt, ##__VA_ARGS__); \
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})
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#else
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2011-01-13 08:59:47 +08:00
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#define printk_ratelimited(fmt, ...) \
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no_printk(fmt, ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#endif
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2011-01-13 08:59:47 +08:00
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#define pr_emerg_ratelimited(fmt, ...) \
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2010-11-16 05:37:37 +08:00
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printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
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2011-01-13 08:59:47 +08:00
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#define pr_alert_ratelimited(fmt, ...) \
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2010-11-16 05:37:37 +08:00
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printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
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2011-01-13 08:59:47 +08:00
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#define pr_crit_ratelimited(fmt, ...) \
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2010-11-16 05:37:37 +08:00
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printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
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2011-01-13 08:59:47 +08:00
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#define pr_err_ratelimited(fmt, ...) \
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2010-11-16 05:37:37 +08:00
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printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
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2011-01-13 08:59:47 +08:00
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#define pr_warn_ratelimited(fmt, ...) \
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2010-11-16 05:37:37 +08:00
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printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
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2011-01-13 08:59:47 +08:00
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#define pr_notice_ratelimited(fmt, ...) \
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2010-11-16 05:37:37 +08:00
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printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
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2011-01-13 08:59:47 +08:00
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#define pr_info_ratelimited(fmt, ...) \
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2010-11-16 05:37:37 +08:00
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printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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/* no pr_cont_ratelimited, don't do that... */
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/* If you are writing a driver, please use dev_dbg instead */
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#if defined(DEBUG)
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2011-01-13 08:59:47 +08:00
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#define pr_debug_ratelimited(fmt, ...) \
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2010-11-16 05:37:37 +08:00
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printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_debug_ratelimited(fmt, ...) \
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2011-01-13 08:59:45 +08:00
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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2010-11-16 05:37:37 +08:00
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#endif
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2011-01-13 08:59:47 +08:00
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enum {
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DUMP_PREFIX_NONE,
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DUMP_PREFIX_ADDRESS,
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DUMP_PREFIX_OFFSET
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};
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extern void hex_dump_to_buffer(const void *buf, size_t len,
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int rowsize, int groupsize,
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char *linebuf, size_t linebuflen, bool ascii);
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#ifdef CONFIG_PRINTK
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extern void print_hex_dump(const char *level, const char *prefix_str,
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int prefix_type, int rowsize, int groupsize,
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const void *buf, size_t len, bool ascii);
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extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
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const void *buf, size_t len);
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#else
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static inline void print_hex_dump(const char *level, const char *prefix_str,
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int prefix_type, int rowsize, int groupsize,
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const void *buf, size_t len, bool ascii)
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{
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}
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static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
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const void *buf, size_t len)
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{
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}
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#endif
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2010-11-16 05:37:37 +08:00
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#endif
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