linux-kernel - Re: [PATCH 02/15] syscalls: fix compat_sys_io_pgetevents

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Date: Fri, 21 Jun 2024 16:19:55 +0200
From: Heiko Carstens <hca@...ux.ibm.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.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, 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,
        stable@...r.kernel.org
Subject: Re: [PATCH 02/15] syscalls: fix compat_sys_io_pgetevents_time64 usage

On Thu, Jun 20, 2024 at 06:23:03PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Using sys_io_pgetevents() as the entry point for compat mode tasks
> works almost correctly, but misses the sign extension for the min_nr
> and nr arguments.
> 
> This was addressed on parisc by switching to
> compat_sys_io_pgetevents_time64() in commit 6431e92fc827 ("parisc:
> io_pgetevents_time64() needs compat syscall in 32-bit compat mode"),
> as well as by using more sophisticated system call wrappers on x86 and
> s390. However, arm64, mips, powerpc, sparc and riscv still have the
> same bug.
> 
> Changes all of them over to use compat_sys_io_pgetevents_time64()
> like parisc already does. This was clearly the intention when the
> function was originally added, but it got hooked up incorrectly in
> the tables.
> 
> Cc: stable@...r.kernel.org
> Fixes: 48166e6ea47d ("y2038: add 64-bit time_t syscalls to all 32-bit architectures")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm64/include/asm/unistd32.h         | 2 +-
>  arch/mips/kernel/syscalls/syscall_n32.tbl | 2 +-
>  arch/mips/kernel/syscalls/syscall_o32.tbl | 2 +-
>  arch/powerpc/kernel/syscalls/syscall.tbl  | 2 +-
>  arch/s390/kernel/syscalls/syscall.tbl     | 2 +-
>  arch/sparc/kernel/syscalls/syscall.tbl    | 2 +-
>  arch/x86/entry/syscalls/syscall_32.tbl    | 2 +-
>  include/uapi/asm-generic/unistd.h         | 2 +-
>  8 files changed, 8 insertions(+), 8 deletions(-)

Acked-by: Heiko Carstens <hca@...ux.ibm.com> # s390