From: Bjorn Andersson bjorn.andersson@oss.qualcomm.com
[ Upstream commit 9f9967fed9d066ed3dae9372b45ffa4f6fccfeef ]
When the MDT loader is used in remoteproc, the ELF header is sanitized beforehand, but that's not necessary the case for other clients.
Validate the size of the firmware buffer to ensure that we don't read past the end as we iterate over the header. e_phentsize and e_shentsize are validated as well, to ensure that the assumptions about step size in the traversal are valid.
Fixes: 2aad40d911ee ("remoteproc: Move qcom_mdt_loader into drivers/soc/qcom") Cc: stable@vger.kernel.org Reported-by: Doug Anderson dianders@chromium.org Signed-off-by: Bjorn Andersson bjorn.andersson@oss.qualcomm.com Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@oss.qualcomm.com Link: https://lore.kernel.org/r/20250610-mdt-loader-validation-and-fixes-v2-1-f707... Signed-off-by: Bjorn Andersson andersson@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soc/qcom/mdt_loader.c | 41 +++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+)
diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c index 6034cd8992b0..c2bbde533e66 100644 --- a/drivers/soc/qcom/mdt_loader.c +++ b/drivers/soc/qcom/mdt_loader.c @@ -12,11 +12,43 @@ #include <linux/firmware.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/overflow.h> #include <linux/qcom_scm.h> #include <linux/sizes.h> #include <linux/slab.h> #include <linux/soc/qcom/mdt_loader.h>
+static bool mdt_header_valid(const struct firmware *fw) +{ + const struct elf32_hdr *ehdr; + size_t phend; + size_t shend; + + if (fw->size < sizeof(*ehdr)) + return false; + + ehdr = (struct elf32_hdr *)fw->data; + + if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) + return false; + + if (ehdr->e_phentsize != sizeof(struct elf32_phdr)) + return false; + + phend = size_add(size_mul(sizeof(struct elf32_phdr), ehdr->e_phnum), ehdr->e_phoff); + if (phend > fw->size) + return false; + + if (ehdr->e_shentsize != sizeof(struct elf32_shdr)) + return false; + + shend = size_add(size_mul(sizeof(struct elf32_shdr), ehdr->e_shnum), ehdr->e_shoff); + if (shend > fw->size) + return false; + + return true; +} + static bool mdt_phdr_valid(const struct elf32_phdr *phdr) { if (phdr->p_type != PT_LOAD) @@ -46,6 +78,9 @@ ssize_t qcom_mdt_get_size(const struct firmware *fw) phys_addr_t max_addr = 0; int i;
+ if (!mdt_header_valid(fw)) + return -EINVAL; + ehdr = (struct elf32_hdr *)fw->data; phdrs = (struct elf32_phdr *)(ehdr + 1);
@@ -92,6 +127,9 @@ void *qcom_mdt_read_metadata(const struct firmware *fw, size_t *data_len) size_t ehdr_size; void *data;
+ if (!mdt_header_valid(fw)) + return ERR_PTR(-EINVAL); + ehdr = (struct elf32_hdr *)fw->data; phdrs = (struct elf32_phdr *)(ehdr + 1);
@@ -151,6 +189,9 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw, if (!fw || !mem_region || !mem_phys || !mem_size) return -EINVAL;
+ if (!mdt_header_valid(fw)) + return -EINVAL; + ehdr = (struct elf32_hdr *)fw->data; phdrs = (struct elf32_phdr *)(ehdr + 1);