Hi Michael,
On Fri, Oct 12, 2018 at 2:27 AM Michael Schmitz <schmitzmic@xxxxxxxxx> wrote:
The Amiga partition parser module uses signed int for partition sector
address and count, which will overflow for disks larger than 1 TB.
Use sector_t as type for sector address and size to allow using disks
up to 2 TB without LBD support, and disks larger than 2 TB with LBD.
This bug was reported originally in 2012, and the fix was created by
the RDB author, Joanne Dow <jdow@xxxxxxxxxxxxx>. A patch had been
discussed and reviewed on linux-m68k at that time but never officially
submitted. This patch differs from Joanne's patch only in its use of
sector_t instead of unsigned int. No checking for overflows is done
(see patch 2 of this series for that).
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=43511
Reported-by: Martin Steigerwald <Martin@xxxxxxxxxxxx>
Message-ID: <201206192146.09327.Martin@xxxxxxxxxxxx>
Signed-off-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
Tested-by: Martin Steigerwald <Martin@xxxxxxxxxxxx>
Thanks for your patch!
Changes from v4:
Andreas Schwab:
- correct cast to sector_t in sector address calculations
Which you only did for the first case...
--- a/block/partitions/amiga.c
+++ b/block/partitions/amiga.c
@@ -100,14 +101,14 @@ int amiga_partition(struct parsed_partitions *state)
/* Tell Kernel about it */
- nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
- be32_to_cpu(pb->pb_Environment[9])) *
+ nr_sects = ((sector_t) be32_to_cpu(pb->pb_Environment[10])
...here ...
+ + 1 - be32_to_cpu(pb->pb_Environment[9])) *
be32_to_cpu(pb->pb_Environment[3]) *
be32_to_cpu(pb->pb_Environment[5]) *
blksize;
if (!nr_sects)
continue;
- start_sect = be32_to_cpu(pb->pb_Environment[9]) *
+ start_sect = (sector_t) be32_to_cpu(pb->pb_Environment[9]) *
... but not here?
be32_to_cpu(pb->pb_Environment[3]) *
be32_to_cpu(pb->pb_Environment[5]) *
blksize;
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
