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Message-ID: <ZnU480Ypb3f3nOek@alpha.franken.de>
Date: Fri, 21 Jun 2024 10:25:23 +0200
From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
Arnd Bergmann <arnd@...db.de>, linux-mips@...r.kernel.org,
Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Andreas Larsson <andreas@...sler.com>, sparclinux@...r.kernel.org,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
"Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
linuxppc-dev@...ts.ozlabs.org, Brian Cain <bcain@...cinc.com>,
linux-hexagon@...r.kernel.org, Guo Ren <guoren@...nel.org>,
linux-csky@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
linux-s390@...r.kernel.org, Rich Felker <dalias@...c.org>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
linux-sh@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
Alexander Viro <viro@...IV.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
linux-fsdevel@...r.kernel.org, libc-alpha@...rceware.org,
musl@...ts.openwall.com, ltp@...ts.linux.it
Subject: Re: [PATCH 03/15] mips: fix compat_sys_lseek syscall
On Thu, Jun 20, 2024 at 06:23:04PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> This is almost compatible, but passing a negative offset should result
> in a EINVAL error, but on mips o32 compat mode would seek to a large
> 32-bit byte offset.
>
> Use compat_sys_lseek() to correctly sign-extend the argument.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> arch/mips/kernel/syscalls/syscall_o32.tbl | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
> index 85751c9b9cdb..2439a2491cff 100644
> --- a/arch/mips/kernel/syscalls/syscall_o32.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
> @@ -27,7 +27,7 @@
> 17 o32 break sys_ni_syscall
> # 18 was sys_stat
> 18 o32 unused18 sys_ni_syscall
> -19 o32 lseek sys_lseek
> +19 o32 lseek sys_lseek compat_sys_lseek
> 20 o32 getpid sys_getpid
> 21 o32 mount sys_mount
> 22 o32 umount sys_oldumount
> --
> 2.39.2
applied to mips-fixes.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
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