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generic compat_sys_ustat

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Due to a different size of ino_t ustat needs a compat handler, but
currently only x86 and mips provide one.  Add a generic compat_sys_ustat
and switch all architectures over to it.  Instead of doing various
user copy hacks compat_sys_ustat just reimplements sys_ustat as
it's trivial.  This was suggested by Arnd Bergmann.

Found by Eric Sandeen when running xfstests/017 on ppc64, which causes
stack smashing warnings on RHEL/Fedora due to the too large amount of
data writen by the syscall.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2008-11-28 10:09:09 +01:00
committed by Al Viro
parent ec1ab0abde
commit 2b1c6bd77d
13 changed files with 43 additions and 72 deletions
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2
arch/powerpc/include/asm/systbl.h
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@@ -65,7 +65,7 @@ SYSCALL(ni_syscall)
SYSX(sys_ni_syscall,sys_olduname, sys_olduname)
COMPAT_SYS_SPU(umask)
SYSCALL_SPU(chroot)
SYSCALL(ustat)
COMPAT_SYS(ustat)
SYSCALL_SPU(dup2)
SYSCALL_SPU(getppid)
SYSCALL_SPU(getpgrp)