So I was playing with gdb today and did this simple thing:
gdb /bin/ls
...
(gdb) run
Box exploded with this splat:
BUG: unable to handle kernel NULL pointer dereference at
00000000000001d0
IP: [<
ffffffff8100fe5a>] xstateregs_get+0x7a/0x120
[...]
Call Trace:
ptrace_regset
ptrace_request
? wait_task_inactive
? preempt_count_sub
arch_ptrace
? ptrace_get_task_struct
SyS_ptrace
system_call_fastpath
... because we do cache &target->thread.fpu.state->xsave into the
local variable xsave but that pointer is NULL at that time and
it gets initialized later, in init_fpu(), see:
e7f180dcd8ab ("x86/fpu: Change xstateregs_get()/set() to use ->xsave.i387 rather than ->fxsave")
The fix is simple: load xsave *after* init_fpu() has run.
Also do the same in xstateregs_set(), as suggested by Oleg Nesterov.
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Tavis Ormandy <taviso@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1429209697-5902-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
- struct xsave_struct *xsave = &target->thread.fpu.state->xsave;
+ struct xsave_struct *xsave;
int ret;
if (!cpu_has_xsave)
int ret;
if (!cpu_has_xsave)
+ xsave = &target->thread.fpu.state->xsave;
+
/*
* Copy the 48bytes defined by the software first into the xstate
* memory layout in the thread struct, so that we can copy the entire
/*
* Copy the 48bytes defined by the software first into the xstate
* memory layout in the thread struct, so that we can copy the entire
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
- struct xsave_struct *xsave = &target->thread.fpu.state->xsave;
+ struct xsave_struct *xsave;
int ret;
if (!cpu_has_xsave)
int ret;
if (!cpu_has_xsave)
+ xsave = &target->thread.fpu.state->xsave;
+
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
/*
* mxcsr reserved bits must be masked to zero for security reasons.
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
/*
* mxcsr reserved bits must be masked to zero for security reasons.