+++ This bug was initially created as a clone of Bug #472426 +++ Found this by running a 32-bit xfs_logprint on a 64-bit kernel: # xfs_logprint /dev/loop0 xfs_logprint: *** stack smashing detected ***: xfs_logprint terminated Aborted (core dumped) The problem here is that there is no sys_compat_ustat, and the kernel copies out a structure larger than userspace has provided: 32-bit ustat struct from userspace: struct ustat { __daddr_t f_tfree; /* 0 4 */ __ino_t f_tinode; /* 4 4 */ char f_fname[6]; /* 8 6 */ char f_fpack[6]; /* 14 6 */ /* size: 20, cachelines: 1 */ /* last cacheline: 20 bytes */ }; kernel ustat struct: struct ustat { __kernel_daddr_t f_tfree; /* 0 4 */ /* XXX 4 bytes hole, try to pack */ __kernel_ino_t f_tinode; /* 8 8 */ char f_fname[6]; /* 16 6 */ char f_fpack[6]; /* 22 6 */ /* size: 32, cachelines: 1 */ /* sum members: 24, holes: 1, sum holes: 4 */ /* padding: 4 */ /* last cacheline: 32 bytes */ }; ... so userspace is corrupted when this syscall is called. Christoph Hellwig mentioned that he might take a stab at fixing it, since he's done other compat syscalls, but not sure on what schedule, so perhaps I (or our ppc maintainer, if we have one...?) can take a look at the fix. --- Additional comment from esandeen on 2008-11-20 15:12:27 EDT --- See also http://rhts.redhat.com/cgi-bin/rhts/test_log.cgi?id=5087037 --- Additional comment from esandeen on 2008-11-20 22:00:46 EDT --- I've tested the patch in comment #3 on ppc, and it resolves the issue I saw.
Christoph Hellwig whipped up a patch for this: [PATCH] generic compat_sys_ustat went to LKML on 11/21
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle. Changing version to '10'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
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This is all upstream now.