From: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
[ Upstream commit 84168d1b54e76a1bcb5192991adde5176abe02e3 ]
The code validates that segments of p_memsz bytes of a segment will fit
in the provided memory region, but does not validate that p_filesz bytes
will, which means that an incorrectly crafted ELF header might write
beyond the provided memory region.
Fixes: 051fb70fd4ea ("remoteproc: qcom: Driver for the self-authenticating Hexagon v5")
Reviewed-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210107233119.717173-1-bjorn.andersson@xxxxxxxxxx
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/soc/qcom/mdt_loader.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 08bd8549242a..17cba12cdf61 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -174,6 +174,14 @@ int qcom_mdt_load(struct device *dev, const struct firmware *fw,
break;
}
+ if (phdr->p_filesz > phdr->p_memsz) {
+ dev_err(dev,
+ "refusing to load segment %d with p_filesz > p_memsz\n",
+ i);
+ ret = -EINVAL;
+ break;
+ }
+
ptr = mem_region + offset;
if (phdr->p_filesz) {
--
2.30.2
