This should be v2., first time patches is always counted as v1
On 2/2/2024 12:09 PM, Auditya Bhattaram wrote:
hash_index is evaluated by looping phdrs till QCOM_MDT_TYPE_HASH
is found. Add an upperbound check to phdrs to access within elf size.
Signed-off-by: Auditya Bhattaram <quic_audityab@xxxxxxxxxxx> > ---
Added error prints for Invalid access.
Link for previous discussion https://lore.kernel.org/linux-arm-msm/5d7a3b97-d840-4863-91a0-32c1d8e7532f@xxxxxxxxxx/T/#t
Would be better if you take reference from other patches,
Like above can be done as,
Changes in v2:
- ...
- ,,,
---
drivers/soc/qcom/mdt_loader.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 6f177e46fa0f..61e2377cc5c3 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -145,6 +145,11 @@ void *qcom_mdt_read_metadata(const struct firmware *fw, size_t *data_len,
if (phdrs[0].p_type == PT_LOAD)
return ERR_PTR(-EINVAL);
+ if (((size_t)(phdrs + ehdr->e_phnum)) > ((size_t)ehdr + fw->size)) {
+ dev_err(dev, "Invalid phdrs access: %s\n", fw_name);
+ return ERR_PTR(-EINVAL);
+ }
+
Should this not be marked for stable kernel ? as without this it could
be accessing beyond fw_size for uncertain scenario.
-Mukesh
for (i = 1; i < ehdr->e_phnum; i++) {
if ((phdrs[i].p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH) {
hash_segment = i;
--
2.17.1
