#include <linux/debug_locks.h>
#include <linux/random.h>
#include <linux/kallsyms.h>
+#include <linux/dmi.h>
int panic_on_oops;
-int tainted;
+static unsigned long tainted_mask;
static int pause_on_oops;
static int pause_on_oops_flag;
static DEFINE_SPINLOCK(pause_on_oops_lock);
EXPORT_SYMBOL(panic_notifier_list);
-static int __init panic_setup(char *str)
-{
- panic_timeout = simple_strtoul(str, NULL, 0);
- return 1;
-}
-__setup("panic=", panic_setup);
-
static long no_blink(long time)
{
return 0;
EXPORT_SYMBOL(panic);
+
+struct tnt {
+ u8 bit;
+ char true;
+ char false;
+};
+
+static const struct tnt tnts[] = {
+ { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
+ { TAINT_FORCED_MODULE, 'F', ' ' },
+ { TAINT_UNSAFE_SMP, 'S', ' ' },
+ { TAINT_FORCED_RMMOD, 'R', ' ' },
+ { TAINT_MACHINE_CHECK, 'M', ' ' },
+ { TAINT_BAD_PAGE, 'B', ' ' },
+ { TAINT_USER, 'U', ' ' },
+ { TAINT_DIE, 'D', ' ' },
+ { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
+ { TAINT_WARN, 'W', ' ' },
+ { TAINT_CRAP, 'C', ' ' },
+};
+
/**
* print_tainted - return a string to represent the kernel taint state.
*
* '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.
*
* The string is overwritten by the next call to print_taint().
*/
-
const char *print_tainted(void)
{
- static char buf[20];
- if (tainted) {
- snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c%c",
- tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
- tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
- tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
- tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
- tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
- tainted & TAINT_BAD_PAGE ? 'B' : ' ',
- tainted & TAINT_USER ? 'U' : ' ',
- tainted & TAINT_DIE ? 'D' : ' ',
- tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ',
- tainted & TAINT_WARN ? 'W' : ' ');
- }
- else
+ static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];
+
+ if (tainted_mask) {
+ char *s;
+ int i;
+
+ s = buf + sprintf(buf, "Tainted: ");
+ for (i = 0; i < ARRAY_SIZE(tnts); i++) {
+ const struct tnt *t = &tnts[i];
+ *s++ = test_bit(t->bit, &tainted_mask) ?
+ t->true : t->false;
+ }
+ *s = 0;
+ } else
snprintf(buf, sizeof(buf), "Not tainted");
return(buf);
}
-void add_taint(unsigned flag)
+int test_taint(unsigned flag)
{
- debug_locks = 0; /* can't trust the integrity of the kernel anymore */
- tainted |= flag;
+ return test_bit(flag, &tainted_mask);
+}
+EXPORT_SYMBOL(test_taint);
+
+unsigned long get_taint(void)
+{
+ return tainted_mask;
}
-EXPORT_SYMBOL(add_taint);
-static int __init pause_on_oops_setup(char *str)
+void add_taint(unsigned flag)
{
- pause_on_oops = simple_strtoul(str, NULL, 0);
- return 1;
+ debug_locks = 0; /* can't trust the integrity of the kernel anymore */
+ set_bit(flag, &tainted_mask);
}
-__setup("pause_on_oops=", pause_on_oops_setup);
+EXPORT_SYMBOL(add_taint);
static void spin_msec(int msecs)
{
{
if (!oops_id)
get_random_bytes(&oops_id, sizeof(oops_id));
+ else
+ oops_id++;
return 0;
}
}
#ifdef WANT_WARN_ON_SLOWPATH
-void warn_on_slowpath(const char *file, int line)
+void warn_slowpath(const char *file, int line, const char *fmt, ...)
{
+ va_list args;
char function[KSYM_SYMBOL_LEN];
- unsigned long caller = (unsigned long) __builtin_return_address(0);
+ unsigned long caller = (unsigned long)__builtin_return_address(0);
+ const char *board;
+
sprint_symbol(function, caller);
printk(KERN_WARNING "------------[ cut here ]------------\n");
printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
line, function);
+ board = dmi_get_system_info(DMI_PRODUCT_NAME);
+ if (board)
+ printk(KERN_WARNING "Hardware name: %s\n", board);
+
+ if (fmt) {
+ va_start(args, fmt);
+ vprintk(fmt, args);
+ va_end(args);
+ }
+
print_modules();
dump_stack();
print_oops_end_marker();
add_taint(TAINT_WARN);
}
-EXPORT_SYMBOL(warn_on_slowpath);
+EXPORT_SYMBOL(warn_slowpath);
#endif
#ifdef CONFIG_CC_STACKPROTECTOR
-#ifndef GCC_HAS_SP
-#warning You have selected the CONFIG_CC_STACKPROTECTOR option, but the gcc used does not support this.
-#endif
-static unsigned long __stack_check_testing;
-/*
- * Self test function for the stack-protector feature.
- * This test requires that the local variable absolutely has
- * a stack slot, hence the barrier()s.
- */
-static noinline void __stack_chk_test_func(void)
-{
- unsigned long foo;
- barrier();
- /*
- * we need to make sure we're not about to clobber the return address,
- * while real exploits do this, it's unhealthy on a running system.
- * Besides, if we would, the test is already failed anyway so
- * time to pull the emergency brake on it.
- */
- if ((unsigned long)__builtin_return_address(0) ==
- *(((unsigned long *)&foo)+1)) {
- printk(KERN_ERR "No -fstack-protector-stack-frame!\n");
- return;
- }
-#ifdef CONFIG_FRAME_POINTER
- /* We also don't want to clobber the frame pointer */
- if ((unsigned long)__builtin_return_address(0) ==
- *(((unsigned long *)&foo)+2)) {
- printk(KERN_ERR "No -fstack-protector-stack-frame!\n");
- return;
- }
-#endif
- barrier();
- if (current->stack_canary == *(((unsigned long *)&foo)+1))
- *(((unsigned long *)&foo)+1) = 0;
- else
- printk(KERN_ERR "No -fstack-protector canary found\n");
- barrier();
-}
-
-static int __stack_chk_test(void)
-{
- printk(KERN_INFO "Testing -fstack-protector-all feature\n");
- __stack_check_testing = (unsigned long)&__stack_chk_test_func;
- __stack_chk_test_func();
- if (__stack_check_testing) {
- printk(KERN_ERR "-fstack-protector-all test failed\n");
- WARN_ON(1);
- }
- return 0;
-}
/*
* Called when gcc's -fstack-protector feature is used, and
* gcc detects corruption of the on-stack canary value
*/
void __stack_chk_fail(void)
{
- if (__stack_check_testing == (unsigned long)&__stack_chk_test_func) {
- long delta;
-
- delta = (unsigned long)__builtin_return_address(0) -
- __stack_check_testing;
- /*
- * The test needs to happen inside the test function, so
- * check if the return address is close to that function.
- * The function is only 2 dozen bytes long, but keep a wide
- * safety margin to avoid panic()s for normal users regardless
- * of the quality of the compiler.
- */
- if (delta >= 0 && delta <= 400) {
- __stack_check_testing = 0;
- return;
- }
- }
panic("stack-protector: Kernel stack is corrupted in: %p\n",
__builtin_return_address(0));
}
EXPORT_SYMBOL(__stack_chk_fail);
-late_initcall(__stack_chk_test);
#endif
+
+core_param(panic, panic_timeout, int, 0644);
+core_param(pause_on_oops, pause_on_oops, int, 0644);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff