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Message-Id: <20231004185607.3028392-1-jithu.joseph@intel.com>
Date: Wed, 4 Oct 2023 11:56:07 -0700
From: Jithu Joseph <jithu.joseph@...el.com>
To: hdegoede@...hat.com, markgross@...nel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
rostedt@...dmis.org, jithu.joseph@...el.com, ashok.raj@...el.com,
tony.luck@...el.com, linux-kernel@...r.kernel.org,
platform-driver-x86@...r.kernel.org, patches@...ts.linux.dev,
ravi.v.shankar@...el.com, pengfei.xu@...el.com,
ilpo.jarvinen@...ux.intel.com
Subject: [PATCH v3 5/9] platform/x86/intel/ifs: Validate image size
Perform additional validation prior to loading IFS image.
Error out if the size of the file being loaded doesn't match the size
specified in the header.
Signed-off-by: Jithu Joseph <jithu.joseph@...el.com>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Tested-by: Pengfei Xu <pengfei.xu@...el.com>
---
- changed the dev_err printk format specifiers (Ilpo Järvinen)
drivers/platform/x86/intel/ifs/load.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
index 6b827247945b..582f1801aaaa 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -375,6 +375,7 @@ int ifs_load_firmware(struct device *dev)
{
const struct ifs_test_caps *test = ifs_get_test_caps(dev);
struct ifs_data *ifsd = ifs_get_data(dev);
+ unsigned int expected_size;
const struct firmware *fw;
char scan_path[64];
int ret = -EINVAL;
@@ -389,6 +390,13 @@ int ifs_load_firmware(struct device *dev)
goto done;
}
+ expected_size = ((struct microcode_header_intel *)fw->data)->totalsize;
+ if (fw->size != expected_size) {
+ dev_err(dev, "File size mismatch (expected %u, actual %zu). Corrupted IFS image.\n",
+ expected_size, fw->size);
+ return -EINVAL;
+ }
+
ret = image_sanity_check(dev, (struct microcode_header_intel *)fw->data);
if (ret)
goto release;
--
2.25.1
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