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authorDmitry V. Levin <ldv@altlinux.org>2019-03-29 20:12:30 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-04-04 10:27:17 -0400
commited3bb007021b9bddb90afae28a19f08ed8890add (patch)
treeb363ee6cad7605b0dd2b8d4f3710cf9e11e1bc5d
parent10a16997db3d99fc02c026cf2c6e6c670acafab0 (diff)
downloadlinux-stericsson-ed3bb007021b9bddb90afae28a19f08ed8890add.tar.gz
csky: Fix syscall_get_arguments() and syscall_set_arguments()
C-SKY syscall arguments are located in orig_a0,a1,a2,a3,regs[0],regs[1] fields of struct pt_regs. Due to an off-by-one bug and a bug in pointer arithmetic syscall_get_arguments() was reading orig_a0,regs[1..5] fields instead. Likewise, syscall_set_arguments() was writing orig_a0,regs[1..5] fields instead. Link: http://lkml.kernel.org/r/20190329171230.GB32456@altlinux.org Fixes: 4859bfca11c7d ("csky: System Call") 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: stable@vger.kernel.org # v4.20+ Tested-by: Guo Ren <ren_guo@c-sky.com> Acked-by: Guo Ren <ren_guo@c-sky.com> Signed-off-by: Dmitry V. Levin <ldv@altlinux.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
-rw-r--r--arch/csky/include/asm/syscall.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/csky/include/asm/syscall.h b/arch/csky/include/asm/syscall.h
index d637445737b7..9a9cd81e66c1 100644
--- a/arch/csky/include/asm/syscall.h
+++ b/arch/csky/include/asm/syscall.h
@@ -49,10 +49,11 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
if (i == 0) {
args[0] = regs->orig_a0;
args++;
- i++;
n--;
+ } else {
+ i--;
}
- memcpy(args, &regs->a1 + i * sizeof(regs->a1), n * sizeof(args[0]));
+ memcpy(args, &regs->a1 + i, n * sizeof(args[0]));
}
static inline void
@@ -63,10 +64,11 @@ syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
if (i == 0) {
regs->orig_a0 = args[0];
args++;
- i++;
n--;
+ } else {
+ i--;
}
- memcpy(&regs->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0));
+ memcpy(&regs->a1 + i, args, n * sizeof(regs->a1));
}
static inline int