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authorBruno Pena <brunompena@gmail.com>2019-11-09 15:23:58 +0100
committerPetr Štetiar <ynezz@true.cz>2020-01-20 20:57:21 +0100
commitde80424f706682e8bba27c60bcd2a9c1b4a5e875 (patch)
treeb3d1a96d7bf433808a6a23ab8dbbeed3f783c99b /target/linux/generic/hack-4.19
parent63000bfaf7163d97ac6feb343c7587e3d339e65e (diff)
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kernel: mtd: Make subpartitions inherit parent's access mode
Currently it's not possible to effectively mark a "firmware" partition as read-only. The sub-partitions "kernel", "rootfs" and "rootfs_data" are always created as read-write (ignoring the parent access mode). This patch enforces the access mode of sub-partitions to match the parent partition, which is useful for recovery images that are meant to be fully read-only to avoid accidental damage from end-user. An example of such implementation (read-only firmware image) is the recovery image used on the Zsun-SD100 [1]. Please note the related patch for fstools [2] to enable this read-only concept. [1] https://github.com/brunompena/zsun-resources [2] http://lists.infradead.org/pipermail/openwrt-devel/2020-January/021043.html Signed-off-by: Bruno Pena <brunompena@gmail.com> [removed already obsolete 4.9 kernel patch] Signed-off-by: Petr Štetiar <ynezz@true.cz>
Diffstat (limited to 'target/linux/generic/hack-4.19')
-rw-r--r--target/linux/generic/hack-4.19/401-inherit-parent-partition-access-mode.patch60
1 files changed, 60 insertions, 0 deletions
diff --git a/target/linux/generic/hack-4.19/401-inherit-parent-partition-access-mode.patch b/target/linux/generic/hack-4.19/401-inherit-parent-partition-access-mode.patch
new file mode 100644
index 0000000000..61dd0369a6
--- /dev/null
+++ b/target/linux/generic/hack-4.19/401-inherit-parent-partition-access-mode.patch
@@ -0,0 +1,60 @@
+--- a/drivers/mtd/mtdchar.c
++++ b/drivers/mtd/mtdchar.c
+@@ -583,7 +583,10 @@
+ /* Sanitize user input */
+ p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
+
+- return mtd_add_partition(mtd, p.devname, p.start, p.length);
++ /* No mtd flags masking required */
++ uint32_t mask_flags = 0;
++
++ return mtd_add_partition(mtd, p.devname, p.start, p.length, mask_flags);
+
+ case BLKPG_DEL_PARTITION:
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -679,7 +679,7 @@
+ }
+
+ int mtd_add_partition(struct mtd_info *parent, const char *name,
+- long long offset, long long length)
++ long long offset, long long length, uint32_t mask_flags)
+ {
+ struct mtd_partition part;
+ struct mtd_part *new;
+@@ -700,6 +700,7 @@
+ part.name = name;
+ part.size = length;
+ part.offset = offset;
++ part.mask_flags = mask_flags;
+
+ new = allocate_partition(parent, &part, -1, offset);
+ if (IS_ERR(new))
+@@ -808,10 +809,14 @@
+ /* adjust partition offsets */
+ parts[i].offset += slave->offset;
+
++ /* adjust partition mask */
++ parts[i].mask_flags = !(slave->mtd.flags & MTD_WRITEABLE) ? MTD_WRITEABLE : 0;
++
+ mtd_add_partition(slave->parent,
+ parts[i].name,
+ parts[i].offset,
+- parts[i].size);
++ parts[i].size,
++ parts[i].mask_flags);
+ }
+
+ kfree(parts);
+--- a/include/linux/mtd/partitions.h
++++ b/include/linux/mtd/partitions.h
+@@ -114,7 +114,7 @@
+
+ int mtd_is_partition(const struct mtd_info *mtd);
+ int mtd_add_partition(struct mtd_info *master, const char *name,
+- long long offset, long long length);
++ long long offset, long long length, uint32_t mask_flags);
+ int mtd_del_partition(struct mtd_info *master, int partno);
+ struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd);
+ uint64_t mtdpart_get_offset(const struct mtd_info *mtd);