@@ -22,6 +22,7 @@ struct parsed_partitions {
int limit;
bool access_beyond_eod;
char *pp_buf;
+ sector_t force_gpt_sector;
};
typedef struct {
@@ -621,6 +621,15 @@ static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
if (!good_agpt && force_gpt)
good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes);
+ /*
+ * The force_gpt_sector is used by NVIDIA Tegra partition parser in
+ * order to convey a non-standard location of the GPT entry for lookup.
+ * By default force_gpt_sector is set to 0 and has no effect.
+ */
+ if (!good_agpt && force_gpt && state->force_gpt_sector)
+ good_agpt = is_gpt_valid(state, state->force_gpt_sector,
+ &agpt, &aptes);
+
/* The obviously unsuccessful case */
if (!good_pgpt && !good_agpt)
goto fail;
Most of consumer-grade NVIDIA Tegra devices use a proprietary bootloader that can't be easily replaced because it's locked down using Secure Boot cryptography signing and the crypto keys aren't given to a device owner. These devices usually have eMMC storage that is partitioned using a custom NVIDIA Tegra partition table format. Of course bootloader and other "special things" are stored on the eMMC storage, and thus, the partition format can't be changed. The Tegra partition format has been reverse-engineered, but NVIDIA uses a virtually merged "boot" and "main" eMMC HW partitions in theirs bootloader. This is not supported by Linux kernel and can't be easily implemented. Hence partition table entry isn't accessible by kernel if it's located at the "boot" eMMC partition. Luckily this is a rare case in practice and even if it's the case, likely that the proprietary bootloader will supply kernel with a non-standard gpt_sector= cmdline option. This gpt_sector= argument points at a GPT entry which resides at a non-standard location on the eMMC storage. This patch allows to support the non-standard cmdline option for NVIDIA Tegra devices without bothering any other platforms. The force_gpt_sector parser-state struct member should be set before invoking efi_partition() and it should be unset after the invocation completion. This new parser member instructs GPT parser to look up GPT entry at the given sector if state->force_gpt_sector != 0. This patch is based on the original work done by Colin Cross for the downstream Android kernel. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- block/partitions/check.h | 1 + block/partitions/efi.c | 9 +++++++++ 2 files changed, 10 insertions(+)