1. S8 & S9 x86: vold fails to mount cdrom media containing valid fdisk information
Is the following a known bug?
On Solaris x86 (8 & 9) "vold" sometimes does not mount
ISO9660 cdrom media that contains a valid fdisk master
boot record / partition table.
For example, CDROMs produced by mkisofs 2.0 with the "-hfs"
option (hybrid ISO9660 + Apple HFS CD) contain a valid fdisk
signature word at the end of the first 512 bytes on CD.
To reproduce the problem, prepare a CD-R / CD-RW with a
valid fdisk signature, either
- use mkisofs (2.0) and cdrecord to create a CD-R / CD-RW
containing a hybrid ISO9600 / Apple HFS filesystem
% mkdir iso-source
% echo "hello, world" > iso-source/hello.txt
% mkisofs -o test.iso -hfs iso-source
% cdrecord dev=X,Y,0 test.iso
%
- or copy an ordinary ISO9660 CD, adding the 0x55 0xaa
fdisk signature bytes before writing
% dd if=/vol/dev/aliases/cdrom0 of=cdimg.iso bs=32k
% echo '1fe?w aa55' | adb -w cdimg.iso -
% cdrecord dev=X,Y,0 cdimg.iso
%
To reproduce the problem:
1. start a fresh copy of vold
# /etc/init.d/volmgt stop
# /etc/init.d/volmgt start
#
2. insert the CD prepared above, the one with the valid
fdisk signature bytes
The CD is *not* mounted by vold; the device
/vol/dev/aliases/cdrom0 is created, but reading from it
returns no data:
% od -xc /vol/dev/aliases/cdrom0
0000000
%
(since the device cannot be read, rmmount is unable to
identify a filesystem format and mount the media)
3. Eject the test CD and insert a normal ISO9660 CD, one
without valid fdisk signature:
% eject cdrom0
<insert normal cd>
vold will mount such a cd without problems
4. Eject the normal CD, and re-insert the "fdisk test cd"
Now vold will mount the cd, that was rejected in step 2.
The problem cannot be reproduced on Solaris SPARC.
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by