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| author | Gokul krishna Krishnakumar <quic_gokukris@quicinc.com> | 2023-05-08 17:18:21 -0700 |
|---|---|---|
| committer | Bjorn Andersson <andersson@kernel.org> | 2023-05-24 19:28:57 -0700 |
| commit | 210d12c8197a551caa2979be421aa42381156aec (patch) | |
| tree | 4724237ad4eeb1610c4cf790b7d2d703d287f0e8 /drivers/soc/qcom | |
| parent | 4b11fa4f0737aae1a3fc3cdf367acd4ebb5bc941 (diff) | |
| download | linux-stable-210d12c8197a551caa2979be421aa42381156aec.tar.gz linux-stable-210d12c8197a551caa2979be421aa42381156aec.tar.bz2 linux-stable-210d12c8197a551caa2979be421aa42381156aec.zip | |
soc: qcom: mdt_loader: Enhance split binary detection
It may be that the offset of the first program header lies inside the mdt's
filesize, in this case the loader would incorrectly assume that the bins
were not split and in this scenario the firmware authentication fails.
This change updates the logic used by the mdt loader to understand whether
the firmware images are split or not. It figures this out by checking if
each programs header's segment lies within the file or not.
Co-developed-by: Melody Olvera <quic_molvera@quicinc.com>
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>
Signed-off-by: Gokul krishna Krishnakumar <quic_gokukris@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230509001821.24010-1-quic_gokukris@quicinc.com
Diffstat (limited to 'drivers/soc/qcom')
| -rw-r--r-- | drivers/soc/qcom/mdt_loader.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c index 33dd8c315eb7..892b1648d693 100644 --- a/drivers/soc/qcom/mdt_loader.c +++ b/drivers/soc/qcom/mdt_loader.c @@ -258,6 +258,26 @@ out: } EXPORT_SYMBOL_GPL(qcom_mdt_pas_init); +static bool qcom_mdt_bins_are_split(const struct firmware *fw, const char *fw_name) +{ + const struct elf32_phdr *phdrs; + const struct elf32_hdr *ehdr; + uint64_t seg_start, seg_end; + int i; + + ehdr = (struct elf32_hdr *)fw->data; + phdrs = (struct elf32_phdr *)(ehdr + 1); + + for (i = 0; i < ehdr->e_phnum; i++) { + seg_start = phdrs[i].p_offset; + seg_end = phdrs[i].p_offset + phdrs[i].p_filesz; + if (seg_start > fw->size || seg_end > fw->size) + return true; + } + + return false; +} + static int __qcom_mdt_load(struct device *dev, const struct firmware *fw, const char *fw_name, int pas_id, void *mem_region, phys_addr_t mem_phys, size_t mem_size, @@ -270,6 +290,7 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw, phys_addr_t min_addr = PHYS_ADDR_MAX; ssize_t offset; bool relocate = false; + bool is_split; void *ptr; int ret = 0; int i; @@ -277,6 +298,7 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw, if (!fw || !mem_region || !mem_phys || !mem_size) return -EINVAL; + is_split = qcom_mdt_bins_are_split(fw, fw_name); ehdr = (struct elf32_hdr *)fw->data; phdrs = (struct elf32_phdr *)(ehdr + 1); @@ -330,8 +352,7 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw, ptr = mem_region + offset; - if (phdr->p_filesz && phdr->p_offset < fw->size && - phdr->p_offset + phdr->p_filesz <= fw->size) { + if (phdr->p_filesz && !is_split) { /* Firmware is large enough to be non-split */ if (phdr->p_offset + phdr->p_filesz > fw->size) { dev_err(dev, "file %s segment %d would be truncated\n", |