diff mbox series

[v2,09/13] csky, hexagon: fix broken sys_sync_file_range

Message ID 20240624163707.299494-10-arnd@kernel.org
State New
Headers show
Series linux system call fixes | expand

Commit Message

Arnd Bergmann June 24, 2024, 4:37 p.m. UTC 
From: Arnd Bergmann <arnd@arndb.de>

Both of these architectures require u64 function arguments to be
passed in even/odd pairs of registers or stack slots, which in case of
sync_file_range would result in a seven-argument system call that is
not currently possible. The system call is therefore incompatible with
all existing binaries.

While it would be possible to implement support for seven arguments
like on mips, it seems better to use a six-argument version, either
with the normal argument order but misaligned as on most architectures
or with the reordered sync_file_range2() calling conventions as on
arm and powerpc.

Cc: stable@vger.kernel.org
Acked-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/csky/include/uapi/asm/unistd.h    | 1 +
 arch/hexagon/include/uapi/asm/unistd.h | 1 +
 2 files changed, 2 insertions(+)

Comments

Brian Cain Aug. 16, 2024, 8:27 p.m. UTC | #1 
> -----Original Message-----
> From: Arnd Bergmann <arnd@kernel.org>
> Sent: Monday, June 24, 2024 11:37 AM
> To: linux-arch@vger.kernel.org; linux-kernel@vger.kernel.org
> Cc: Arnd Bergmann <arnd@arndb.de>; Thomas Bogendoerfer
> <tsbogend@alpha.franken.de>; linux-mips@vger.kernel.org; Helge Deller
> <deller@gmx.de>; linux-parisc@vger.kernel.org; David S. Miller
> <davem@davemloft.net>; Andreas Larsson <andreas@gaisler.com>;
> sparclinux@vger.kernel.org; Michael Ellerman <mpe@ellerman.id.au>; Nicholas
> Piggin <npiggin@gmail.com>; Christophe Leroy
> <christophe.leroy@csgroup.eu>; Naveen N . Rao
> <naveen.n.rao@linux.ibm.com>; linuxppc-dev@lists.ozlabs.org; Brian Cain
> <bcain@quicinc.com>; linux-hexagon@vger.kernel.org; Guo Ren
> <guoren@kernel.org>; linux-csky@vger.kernel.org; Heiko Carstens
> <hca@linux.ibm.com>; linux-s390@vger.kernel.org; Rich Felker
> <dalias@libc.org>; John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>;
> linux-sh@vger.kernel.org; H. Peter Anvin <hpa@zytor.com>; Alexander Viro
> <viro@zeniv.linux.org.uk>; Christian Brauner <brauner@kernel.org>; linux-
> fsdevel@vger.kernel.org; libc-alpha@sourceware.org;
> musl@lists.openwall.com; stable@vger.kernel.org
> Subject: [PATCH v2 09/13] csky, hexagon: fix broken sys_sync_file_range
> 
> WARNING: This email originated from outside of Qualcomm. Please be wary of
> any links or attachments, and do not enable macros.
> 
> From: Arnd Bergmann <arnd@arndb.de>
> 
> Both of these architectures require u64 function arguments to be
> passed in even/odd pairs of registers or stack slots, which in case of
> sync_file_range would result in a seven-argument system call that is
> not currently possible. The system call is therefore incompatible with
> all existing binaries.
> 
> While it would be possible to implement support for seven arguments
> like on mips, it seems better to use a six-argument version, either
> with the normal argument order but misaligned as on most architectures
> or with the reordered sync_file_range2() calling conventions as on
> arm and powerpc.
> 
> Cc: stable@vger.kernel.org
> Acked-by: Guo Ren <guoren@kernel.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/csky/include/uapi/asm/unistd.h    | 1 +
>  arch/hexagon/include/uapi/asm/unistd.h | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/arch/csky/include/uapi/asm/unistd.h
> b/arch/csky/include/uapi/asm/unistd.h
> index 7ff6a2466af1..e0594b6370a6 100644
> --- a/arch/csky/include/uapi/asm/unistd.h
> +++ b/arch/csky/include/uapi/asm/unistd.h
> @@ -6,6 +6,7 @@
>  #define __ARCH_WANT_SYS_CLONE3
>  #define __ARCH_WANT_SET_GET_RLIMIT
>  #define __ARCH_WANT_TIME32_SYSCALLS
> +#define __ARCH_WANT_SYNC_FILE_RANGE2
>  #include <asm-generic/unistd.h>
> 
>  #define __NR_set_thread_area   (__NR_arch_specific_syscall + 0)
> diff --git a/arch/hexagon/include/uapi/asm/unistd.h
> b/arch/hexagon/include/uapi/asm/unistd.h
> index 432c4db1b623..21ae22306b5d 100644
> --- a/arch/hexagon/include/uapi/asm/unistd.h
> +++ b/arch/hexagon/include/uapi/asm/unistd.h
> @@ -36,5 +36,6 @@
>  #define __ARCH_WANT_SYS_VFORK
>  #define __ARCH_WANT_SYS_FORK
>  #define __ARCH_WANT_TIME32_SYSCALLS
> +#define __ARCH_WANT_SYNC_FILE_RANGE2

Acked-by: Brian Cain <bcain@quicinc.com>

> 
>  #include <asm-generic/unistd.h>
> --
> 2.39.2
diff mbox series

Patch

diff --git a/arch/csky/include/uapi/asm/unistd.h b/arch/csky/include/uapi/asm/unistd.h
index 7ff6a2466af1..e0594b6370a6 100644
--- a/arch/csky/include/uapi/asm/unistd.h
+++ b/arch/csky/include/uapi/asm/unistd.h
@@ -6,6 +6,7 @@ 
 #define __ARCH_WANT_SYS_CLONE3
 #define __ARCH_WANT_SET_GET_RLIMIT
 #define __ARCH_WANT_TIME32_SYSCALLS
+#define __ARCH_WANT_SYNC_FILE_RANGE2
 #include <asm-generic/unistd.h>
 
 #define __NR_set_thread_area	(__NR_arch_specific_syscall + 0)
diff --git a/arch/hexagon/include/uapi/asm/unistd.h b/arch/hexagon/include/uapi/asm/unistd.h
index 432c4db1b623..21ae22306b5d 100644
--- a/arch/hexagon/include/uapi/asm/unistd.h
+++ b/arch/hexagon/include/uapi/asm/unistd.h
@@ -36,5 +36,6 @@ 
 #define __ARCH_WANT_SYS_VFORK
 #define __ARCH_WANT_SYS_FORK
 #define __ARCH_WANT_TIME32_SYSCALLS
+#define __ARCH_WANT_SYNC_FILE_RANGE2
 
 #include <asm-generic/unistd.h>