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taint: consolidate documentation

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This consolidates the taint bit documentation into a single place with
both numeric and letter values.  Additionally adds the missing TAINT_AUX
documentation.

Link: http://lkml.kernel.org/r/1519084390-43867-3-git-send-email-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2018-04-10 16:32:29 -07:00 committed by Linus Torvalds
parent 47d4b263a2
commit 9c4560e5bb
2 changed files with 30 additions and 44 deletions
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51
Documentation/sysctl/kernel.txt
View file

@ -964,32 +964,33 @@ detect a hard lockup condition.
tainted:
Non-zero if the kernel has been tainted. Numeric values, which
can be ORed together:
Non-zero if the kernel has been tainted. Numeric values, which can be
ORed together. The letters are seen in "Tainted" line of Oops reports.
1 - A module with a non-GPL license has been loaded, this
includes modules with no license.
Set by modutils >= 2.4.9 and module-init-tools.
2 - A module was force loaded by insmod -f.
Set by modutils >= 2.4.9 and module-init-tools.
4 - Unsafe SMP processors: SMP with CPUs not designed for SMP.
8 - A module was forcibly unloaded from the system by rmmod -f.
16 - A hardware machine check error occurred on the system.
32 - A bad page was discovered on the system.
64 - The user has asked that the system be marked "tainted". This
could be because they are running software that directly modifies
the hardware, or for other reasons.
128 - The system has died.
256 - The ACPI DSDT has been overridden with one supplied by the user
instead of using the one provided by the hardware.
512 - A kernel warning has occurred.
1024 - A module from drivers/staging was loaded.
2048 - The system is working around a severe firmware bug.
4096 - An out-of-tree module has been loaded.
8192 - An unsigned module has been loaded in a kernel supporting module
signature.
16384 - A soft lockup has previously occurred on the system.
32768 - The kernel has been live patched.
1 (P): A module with a non-GPL license has been loaded, this
includes modules with no license.
Set by modutils >= 2.4.9 and module-init-tools.
2 (F): A module was force loaded by insmod -f.
Set by modutils >= 2.4.9 and module-init-tools.
4 (S): Unsafe SMP processors: SMP with CPUs not designed for SMP.
8 (R): A module was forcibly unloaded from the system by rmmod -f.
16 (M): A hardware machine check error occurred on the system.
32 (B): A bad page was discovered on the system.
64 (U): The user has asked that the system be marked "tainted". This
could be because they are running software that directly modifies
the hardware, or for other reasons.
128 (D): The system has died.
256 (A): The ACPI DSDT has been overridden with one supplied by the user
instead of using the one provided by the hardware.
512 (W): A kernel warning has occurred.
1024 (C): A module from drivers/staging was loaded.
2048 (I): The system is working around a severe firmware bug.
4096 (O): An out-of-tree module has been loaded.
8192 (E): An unsigned module has been loaded in a kernel supporting module
signature.
16384 (L): A soft lockup has previously occurred on the system.
32768 (K): The kernel has been live patched.
65536 (X): Auxiliary taint, defined and used by for distros.
==============================================================

23
kernel/panic.c
View file

@ -328,27 +328,12 @@ const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
};
/**
* print_tainted - return a string to represent the kernel taint state.
* print_tainted - return a string to represent the kernel taint state.
*
* 'P' - Proprietary module has been loaded.
* 'F' - Module has been forcibly loaded.
* 'S' - SMP with CPUs not designed for SMP.
* 'R' - User forced a module unload.
* 'M' - System experienced a machine check exception.
* 'B' - System has hit bad_page.
* 'U' - Userspace-defined naughtiness.
* 'D' - Kernel has oopsed before
* 'A' - ACPI table overridden.
* 'W' - Taint on warning.
* 'C' - modules from drivers/staging are loaded.
* 'I' - Working around severe firmware bug.
* 'O' - Out-of-tree module has been loaded.
* 'E' - Unsigned module has been loaded.
* 'L' - A soft lockup has previously occurred.
* 'K' - Kernel has been live patched.
* 'X' - Auxiliary taint, for distros' use.
* For individual taint flag meanings, see Documentation/sysctl/kernel.txt
*
* The string is overwritten by the next call to print_tainted().
* The string is overwritten by the next call to print_tainted(),
* but is always NULL terminated.
*/
const char *print_tainted(void)
{