Messages in this thread | | | Subject | shmem_file_setup creating SYSV00000000 files in (ext3) root filesystem | From | desrt <> | Date | Fri, 05 Dec 2003 22:45:44 -0500 |
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kernel version is 2.4.23.
the problem is caused by the fact that the checks that shmem_file_setup does to determine the location of the mountpoint of tmpfs fail to take into account the effect of pivot_root.
that is: if i mount a tmpfs as /, then mount a ext3 filesystem and pivot_root into it with put_old as, say, /var/tmp, then shmem_file_setup will still think that the tmpfs is mounted at / (and as a result creates shared memory files on the root filesystem instead of on /var/tmp as it ought to)
i'm not actually sure what the code in mm/shmem.c:shmem_file_setup() does, but i assume the problem is this line: root = shm_mnt->mnt_root;
and somehow as a result, this happens: peloton:/proc# grep deleted */maps 17923/maps:4201a000-4207a000 rw-s 00000000 00:04 21233690 /SYSV00000000 (deleted) 17923/maps:424dd000-4253d000 rw-s 00000000 00:04 21266460 /SYSV00000000 (deleted) 17926/maps:4201a000-4207a000 rw-s 00000000 00:04 21233690 /SYSV00000000 (deleted) 17926/maps:424dd000-4253d000 rw-s 00000000 00:04 21266460 /SYSV00000000 (deleted) 17927/maps:4201a000-4207a000 rw-s 00000000 00:04 21233690 /SYSV00000000 (deleted) [many many many lines follow]
if you have any advice or can confirm to me that this is actually a bug in the kernel, please reply. i'm not on the list.
thanks, ryan.
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