* Patch "riscv: Fix syscall_get_arguments() and syscall_set_arguments()" has been added to the 5.0-stable tree
@ 2019-04-15 12:14 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2019-04-15 12:14 UTC (permalink / raw)
To: 20190329171221.GA32456, aou, gregkh, keescook, ldv, linux-riscv,
luto, mingo, palmer, rostedt, wad
Cc: stable-commits
This is a note to let you know that I've just added the patch titled
riscv: Fix syscall_get_arguments() and syscall_set_arguments()
to the 5.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
riscv-fix-syscall_get_arguments-and-syscall_set_arguments.patch
and it can be found in the queue-5.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
From 10a16997db3d99fc02c026cf2c6e6c670acafab0 Mon Sep 17 00:00:00 2001
From: "Dmitry V. Levin" <ldv@altlinux.org>
Date: Fri, 29 Mar 2019 20:12:21 +0300
Subject: riscv: Fix syscall_get_arguments() and syscall_set_arguments()
From: Dmitry V. Levin <ldv@altlinux.org>
commit 10a16997db3d99fc02c026cf2c6e6c670acafab0 upstream.
RISC-V syscall arguments are located in orig_a0,a1..a5 fields
of struct pt_regs.
Due to an off-by-one bug and a bug in pointer arithmetic
syscall_get_arguments() was reading s3..s7 fields instead of a1..a5.
Likewise, syscall_set_arguments() was writing s3..s7 fields
instead of a1..a5.
Link: http://lkml.kernel.org/r/20190329171221.GA32456@altlinux.org
Fixes: e2c0cdfba7f69 ("RISC-V: User-facing API")
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Will Drewry <wad@chromium.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org
Cc: stable@vger.kernel.org # v4.15+
Acked-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/riscv/include/asm/syscall.h | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/arch/riscv/include/asm/syscall.h
+++ b/arch/riscv/include/asm/syscall.h
@@ -79,10 +79,11 @@ static inline void syscall_get_arguments
if (i == 0) {
args[0] = regs->orig_a0;
args++;
- i++;
n--;
+ } else {
+ i--;
}
- memcpy(args, ®s->a1 + i * sizeof(regs->a1), n * sizeof(args[0]));
+ memcpy(args, ®s->a1 + i, n * sizeof(args[0]));
}
static inline void syscall_set_arguments(struct task_struct *task,
@@ -94,10 +95,11 @@ static inline void syscall_set_arguments
if (i == 0) {
regs->orig_a0 = args[0];
args++;
- i++;
n--;
- }
- memcpy(®s->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0));
+ } else {
+ i--;
+ }
+ memcpy(®s->a1 + i, args, n * sizeof(regs->a1));
}
static inline int syscall_get_arch(void)
Patches currently in stable-queue which might be from ldv@altlinux.org are
queue-5.0/riscv-fix-syscall_get_arguments-and-syscall_set_arguments.patch
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2019-04-15 12:14 Patch "riscv: Fix syscall_get_arguments() and syscall_set_arguments()" has been added to the 5.0-stable tree gregkh
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