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| author | Christoph Hellwig <hch@lst.de> | 2023-05-31 14:55:34 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-06-05 11:10:14 -0600 |
| commit | 8d03187ee7328af8e18ef1782289e0b034e75485 (patch) | |
| tree | ae7d1975d46c3280ecdf665602eecd66e92d09b1 /drivers/mtd/devices | |
| parent | b2baa57475e3a24bb9ad27bb9047ea3be94627f5 (diff) | |
| download | linux-stable-8d03187ee7328af8e18ef1782289e0b034e75485.tar.gz linux-stable-8d03187ee7328af8e18ef1782289e0b034e75485.tar.bz2 linux-stable-8d03187ee7328af8e18ef1782289e0b034e75485.zip | |
mtd: block2mtd: don't call early_lookup_bdev after the system is running
early_lookup_bdev is supposed to only be called from the early boot
code, but mdtblock_early_get_bdev is called as a general fallback when
lookup_bdev fails, which is problematic because early_lookup_bdev
bypasses all normal path based permission checking, and might cause
problems with certain container environments renaming devices.
Switch to only call early_lookup_bdev when block2mtd is built-in and the
system state in not running yet.
Note that this strictly speaking changes the kernel ABI as the PARTUUID=
and PARTLABEL= style syntax is now not available during a running
systems. They never were intended for that, but this breaks things
we'll have to figure out a way to make them available again. But if
avoidable in any way I'd rather avoid that.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230531125535.676098-24-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/mtd/devices')
| -rw-r--r-- | drivers/mtd/devices/block2mtd.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c index 457774eef4d0..218eb2af564a 100644 --- a/drivers/mtd/devices/block2mtd.c +++ b/drivers/mtd/devices/block2mtd.c @@ -215,7 +215,11 @@ static void block2mtd_free_device(struct block2mtd_dev *dev) kfree(dev); } -static struct block_device *mdtblock_early_get_bdev(const char *devname, +/* + * This function is marked __ref because it calls the __init marked + * early_lookup_bdev when called from the early boot code. + */ +static struct block_device __ref *mdtblock_early_get_bdev(const char *devname, fmode_t mode, int timeout, struct block2mtd_dev *dev) { struct block_device *bdev = ERR_PTR(-ENODEV); @@ -223,6 +227,12 @@ static struct block_device *mdtblock_early_get_bdev(const char *devname, int i; /* + * We can't use early_lookup_bdev from a running system. + */ + if (system_state >= SYSTEM_RUNNING) + return bdev; + + /* * We might not have the root device mounted at this point. * Try to resolve the device name by other means. */ |