h8300/ptrace: Fix incorrect register transfer count

regs_set() and regs_get() are vulnerable to an off-by-1 buffer overrun
if CONFIG_CPU_H8S is set, since this adds an extra entry to
register_offset[] but not to user_regs_struct.

So, iterate over user_regs_struct based on its actual size, not based on
the length of register_offset[].

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/h8300/kernel/ptrace.c b/arch/h8300/kernel/ptrace.c
index 9207554..0dc1c8f 100644 (file)
--- a/arch/h8300/kernel/ptrace.c
+++ b/arch/h8300/kernel/ptrace.c
@@ -95,7 +95,8 @@ static int regs_get(struct task_struct *target,
        long *reg = (long *)&regs;
 
        /* build user regs in buffer */
-       for (r = 0; r < ARRAY_SIZE(register_offset); r++)
+       BUILD_BUG_ON(sizeof(regs) % sizeof(long) != 0);
+       for (r = 0; r < sizeof(regs) / sizeof(long); r++)
                *reg++ = h8300_get_reg(target, r);
 
        return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
@@ -113,7 +114,8 @@ static int regs_set(struct task_struct *target,
        long *reg;
 
        /* build user regs in buffer */
-       for (reg = (long *)&regs, r = 0; r < ARRAY_SIZE(register_offset); r++)
+       BUILD_BUG_ON(sizeof(regs) % sizeof(long) != 0);
+       for (reg = (long *)&regs, r = 0; r < sizeof(regs) / sizeof(long); r++)
                *reg++ = h8300_get_reg(target, r);
 
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
@@ -122,7 +124,7 @@ static int regs_set(struct task_struct *target,
                return ret;
 
        /* write back to pt_regs */
-       for (reg = (long *)&regs, r = 0; r < ARRAY_SIZE(register_offset); r++)
+       for (reg = (long *)&regs, r = 0; r < sizeof(regs) / sizeof(long); r++)
                h8300_put_reg(target, r, *reg++);
        return 0;
 }