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ACPI: Taint kernel on ACPI table override (format corrected) 

When an ACPI table is overridden (for now this can happen only for DSDT)
display a big warning and taint the kernel with flag A.

Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Éric Piel 2008-02-05 00:04:50 +01:00 committed by Len Brown
parent 71fc47a9ad
commit 6ed31e92e9
3 changed files with 11 additions and 2 deletions
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7
drivers/acpi/osl.c
View File

@ -392,6 +392,13 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
*new_table = initrd_table;
}
#endif
if (*new_table != NULL) {
printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
"this is unsafe: tainting kernel\n",
existing_table->signature,
existing_table->oem_table_id);
add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
}
return AE_OK;
}

1
include/linux/kernel.h
View File

@ -243,6 +243,7 @@ extern enum system_states {
#define TAINT_BAD_PAGE (1<<5)
#define TAINT_USER (1<<6)
#define TAINT_DIE (1<<7)
#define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8)
extern void dump_stack(void) __cold;

5
kernel/panic.c
View File

@ -161,7 +161,7 @@ const char *print_tainted(void)
{
static char buf[20];
if (tainted) {
snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c",
snprintf(buf, sizeof(buf), "Tainted: %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' : ' ',
@ -169,7 +169,8 @@ const char *print_tainted(void)
tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
tainted & TAINT_BAD_PAGE ? 'B' : ' ',
tainted & TAINT_USER ? 'U' : ' ',
tainted & TAINT_DIE ? 'D' : ' ');
tainted & TAINT_DIE ? 'D' : ' ',
tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ');
}
else
snprintf(buf, sizeof(buf), "Not tainted");