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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2018 Michael Moese <mmoese@suse.de>
*/
/* Usage example
*
* ...
* #include "tst_test.h"
* ..
* static struct tst_test test = {
* ...
* .taint_check = TST_TAINT_W | TST_TAINT_D,
* ...
* };
*
* void run(void)
* {
* ...
* . test code here
* ...
* if (tst_taint_check() != 0)
* tst_res(TFAIL, "kernel has issues");
* else
* tst_res(TPASS, "kernel seems to be fine");
* }
*
*
*
* The above code checks whether the kernel issued a warning (TST_TAINT_W)
* or even died (TST_TAINT_D) during test execution.
* If these are set after running a test case, we most likely
* triggered a kernel bug.
*
* You do not need to use tst_taint_check() explicitly because it'll be called
* automatically at the end of testing by the LTP library if
* tst_test.taint_check in non-zero.
*/
#ifndef TST_TAINTED_H__
#define TST_TAINTED_H__
/*
* This are all 17 flags that are present in kernel 4.15
* see kernel/panic.c in kernel sources
*
* Not all of them are valid in all kernel versions.
*/
#define TST_TAINT_G (1 << 0) /* a module with non-GPL license loaded */
#define TST_TAINT_F (1 << 1) /* a module was force-loaded */
#define TST_TAINT_S (1 << 2) /* SMP with Non-SMP kernel */
#define TST_TAINT_R (1 << 3) /* module force unloaded */
#define TST_TAINT_M (1 << 4) /* machine check error occurred */
#define TST_TAINT_B (1 << 5) /* page-release function found bad page */
#define TST_TAINT_U (1 << 6) /* user requested taint flag */
#define TST_TAINT_D (1 << 7) /* kernel died recently - OOPS or BUG */
#define TST_TAINT_A (1 << 8) /* ACPI table has been overwritten */
#define TST_TAINT_W (1 << 9) /* a warning has been issued by kernel */
#define TST_TAINT_C (1 << 10) /* driver from drivers/staging was loaded */
#define TST_TAINT_I (1 << 11) /* working around BIOS/Firmware bug */
#define TST_TAINT_O (1 << 12) /* out of tree module loaded */
#define TST_TAINT_E (1 << 13) /* unsigned module was loaded */
#define TST_TAINT_L (1 << 14) /* A soft lock-up has previously occurred */
#define TST_TAINT_K (1 << 15) /* kernel has been live-patched */
#define TST_TAINT_X (1 << 16) /* auxiliary taint, for distro's use */
#define TST_TAINT_T (1 << 17) /* kernel was built with the struct randomization plugin */
/*
* Initialize and prepare support for checking tainted kernel. Called
* automatically by LTP library during test setup if tst_test.taint_check
* is non-zero. The value of tst_test.taint_check will be passed as the mask
* argument.
*
* supply the mask of TAINT-flags you want to check, for example
* (TST_TAINT_W | TST_TAINT_D) when you want to check if the kernel issued
* a warning or even reported it died.
*
* This function tests if the requested flags are supported on the
* locally running kernel. In case the tainted-flags are already set by
* the kernel, there is no reason to continue and TBROK is generated.
*
* The mask must not be zero.
*/
void tst_taint_init(unsigned int mask);
/*
* check if the tainted flags handed to tst_taint_init() are still not set
* during or after running the test.
* Calling this function is only allowed after tst_taint_init() was called,
* otherwise TBROK will be generated.
*
* returns 0 or a bitmask of the flags that currently tainted the kernel.
*/
unsigned int tst_taint_check(void);
#endif /* TST_TAINTED_H__ */
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