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@xxxxxxxxxxxxxxxx>
---
drivers/acpi/osl.c | 7 +++++++
include/linux/kernel.h | 1 +
kernel/panic.c | 5 +++--
3 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 4568a59..549daea 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -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;
}
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index a7283c9..f51f8bd 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -240,6 +240,7 @@ 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;
diff --git a/kernel/panic.c b/kernel/panic.c
index da4d6ba..1b7a002 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -160,7 +160,7 @@ 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' : ' ',
@@ -168,7 +168,8 @@ 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");
-
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