Hi Sudeep,
>> +static void combine_lpi_states(struct acpi_processor_lpi *l_lpi,
>> + struct acpi_processor_lpi *p_lpi,
>> + struct acpi_processor_lpi *c_lpi)
>> +{
>> + c_lpi->min_residency = max(l_lpi->min_residency, p_lpi->min_residency);
>> + c_lpi->wake_latency = l_lpi->wake_latency + p_lpi->wake_latency;
>> + c_lpi->enable_parent_state = p_lpi->enable_parent_state;
>> + c_lpi->entry_method = l_lpi->entry_method;
>> + c_lpi->address = l_lpi->address + p_lpi->address;
>> + c_lpi->index = p_lpi->index;
>> + c_lpi->flags = p_lpi->flags;
>> + c_lpi->arch_flags = p_lpi->arch_flags;
>> + strncpy(c_lpi->desc, l_lpi->desc, ACPI_CX_DESC_LEN);
>> + strncat(c_lpi->desc, "+", ACPI_CX_DESC_LEN);
>> + strncat(c_lpi->desc, p_lpi->desc, ACPI_CX_DESC_LEN);
>> +}
I suppose you meant to use strl* instead of strn* operations. Below is a
simple patch to fix these. Can you please fold these changes into your next
version as well?
ACPI / Processor: fix buffer overflow caused by strncat/strncpy
The misuse of strncat in LPI code is causing buffer overflow. The fix
is to replace strncat with strlcat.
Signed-off-by: Fan Wu <wufan@xxxxxxxxxxxxxx>
Signed-off-by: Prashanth Prakash <pprakash@xxxxxxxxxxxxxx>
---
drivers/acpi/processor_idle.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index af851f1..4ca42a7 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -856,7 +856,7 @@ static int acpi_processor_setup_cstates(struct acpi_processor *pr)
state = &drv->states[count];
snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
- strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
+ strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
state->exit_latency = cx->latency;
state->target_residency = cx->latency * latency_factor;
state->enter = acpi_idle_enter;
@@ -1009,7 +1009,7 @@ static int acpi_processor_evaluate_lpi(acpi_handle handle,
obj = &element->package.elements[9];
if (obj->type == ACPI_TYPE_STRING)
- strncpy(lpix->desc, obj->string.pointer, ACPI_CX_DESC_LEN);
+ strlcpy(lpix->desc, obj->string.pointer, ACPI_CX_DESC_LEN);
lpix->index = state_count;
@@ -1068,9 +1068,9 @@ static void combine_lpi_states(struct acpi_processor_lpi *l_lpi,
c_lpi->index = p_lpi->index;
c_lpi->flags = p_lpi->flags;
c_lpi->arch_flags = p_lpi->arch_flags;
- strncpy(c_lpi->desc, l_lpi->desc, ACPI_CX_DESC_LEN);
- strncat(c_lpi->desc, "+", ACPI_CX_DESC_LEN);
- strncat(c_lpi->desc, p_lpi->desc, ACPI_CX_DESC_LEN);
+ strlcpy(c_lpi->desc, l_lpi->desc, ACPI_CX_DESC_LEN);
+ strlcat(c_lpi->desc, "+", ACPI_CX_DESC_LEN);
+ strlcat(c_lpi->desc, p_lpi->desc, ACPI_CX_DESC_LEN);
}
static int flatten_lpi_states(struct acpi_processor *pr,
@@ -1190,7 +1190,7 @@ static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
state = &drv->states[i];
snprintf(state->name, CPUIDLE_NAME_LEN, "LPI-%d", i);
- strncpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
+ strlcpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
state->exit_latency = lpi->wake_latency;
state->target_residency = lpi->min_residency;
if (lpi->arch_flags)
--
1.8.2.1
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