From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Fri, 12 Mar 2021 23:20:02 +0000 (-0800)
Subject: remoteproc: qcom_q6v5_mss: Validate p_filesz in ELF loader
X-Git-Tag: v5.15~1197^2~37
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3d2ee78906af5f08d499d6aa3aa504406fa38106;p=platform%2Fkernel%2Flinux-starfive.git

remoteproc: qcom_q6v5_mss: Validate p_filesz in ELF loader

Analog to the issue in the common mdt_loader code the MSS ELF loader
does not validate that p_filesz bytes will fit in the memory region and
that the loaded segments are not truncated. Fix this in the same way
as proposed for the mdt_loader.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Fixes: 135b9e8d1cd8 ("remoteproc: qcom_q6v5_mss: Validate modem blob firmware size before load")
Link: https://lore.kernel.org/r/20210312232002.3466791-1-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 15abfbb..423b31d 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -1210,6 +1210,14 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
 			goto release_firmware;
 		}
 
+		if (phdr->p_filesz > phdr->p_memsz) {
+			dev_err(qproc->dev,
+				"refusing to load segment %d with p_filesz > p_memsz\n",
+				i);
+			ret = -EINVAL;
+			goto release_firmware;
+		}
+
 		ptr = memremap(qproc->mpss_phys + offset, phdr->p_memsz, MEMREMAP_WC);
 		if (!ptr) {
 			dev_err(qproc->dev,
@@ -1241,6 +1249,16 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
 				goto release_firmware;
 			}
 
+			if (seg_fw->size != phdr->p_filesz) {
+				dev_err(qproc->dev,
+					"failed to load segment %d from truncated file %s\n",
+					i, fw_name);
+				ret = -EINVAL;
+				release_firmware(seg_fw);
+				memunmap(ptr);
+				goto release_firmware;
+			}
+
 			release_firmware(seg_fw);
 		}