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kernel/panic.c: add TAINT_AUX

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This is the gist of a patch which we've been forward-porting in our
kernels for a long time now and it probably would make a good sense to
have such TAINT_AUX flag upstream which can be used by each distro etc,
how they see fit.  This way, we won't need to forward-port a distro-only
version indefinitely.

Add an auxiliary taint flag to be used by distros and others.  This
obviates the need to forward-port whatever internal solutions people
have in favor of a single flag which they can map arbitrarily to a
definition of their pleasing.

The "X" mnemonic could also mean eXternal, which would be taint from a
distro or something else but not the upstream kernel.  We will use it to
mark modules for which we don't provide support.  I.e., a really
eXternal module.

Link: http://lkml.kernel.org/r/20170911134533.dp5mtyku5bongx4c@pd.tnic
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Jessica Yu <jeyu@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Borislav Petkov 2017-11-17 15:30:38 -08:00 committed by Linus Torvalds
parent e8cfbc245e
commit 4efb442cc1
2 changed files with 4 additions and 1 deletions
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3
include/linux/kernel.h
View file

@ -549,7 +549,8 @@ extern enum system_states {
#define TAINT_UNSIGNED_MODULE 13 #define TAINT_UNSIGNED_MODULE 13
#define TAINT_SOFTLOCKUP 14 #define TAINT_SOFTLOCKUP 14
#define TAINT_LIVEPATCH 15 #define TAINT_LIVEPATCH 15
#define TAINT_FLAGS_COUNT 16 #define TAINT_AUX 16
#define TAINT_FLAGS_COUNT 17
struct taint_flag { struct taint_flag {
char c_true; /* character printed when tainted */ char c_true; /* character printed when tainted */

2
kernel/panic.c
View file

@ -324,6 +324,7 @@ const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
{ 'E', ' ', true }, /* TAINT_UNSIGNED_MODULE */ { 'E', ' ', true }, /* TAINT_UNSIGNED_MODULE */
{ 'L', ' ', false }, /* TAINT_SOFTLOCKUP */ { 'L', ' ', false }, /* TAINT_SOFTLOCKUP */
{ 'K', ' ', true }, /* TAINT_LIVEPATCH */ { 'K', ' ', true }, /* TAINT_LIVEPATCH */
{ 'X', ' ', true }, /* TAINT_AUX */
}; };
/** /**
@ -345,6 +346,7 @@ const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
* 'E' - Unsigned module has been loaded. * 'E' - Unsigned module has been loaded.
* 'L' - A soft lockup has previously occurred. * 'L' - A soft lockup has previously occurred.
* 'K' - Kernel has been live patched. * 'K' - Kernel has been live patched.
* 'X' - Auxiliary taint, for distros' use.
* *
* The string is overwritten by the next call to print_tainted(). * The string is overwritten by the next call to print_tainted().
*/ */