diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-10-27 13:13:38 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-11-03 14:40:42 +0100 |
| commit | 55a423b6f105fa323168f15f4bb67f23b21da44e (patch) | |
| tree | 518b2d2983596039f5ab0ba4d1d069aa8b7cc0b8 /arch/s390/kernel | |
| parent | ef12cb904e096335ef179bfe30e637a9c2464343 (diff) | |
s390/kernel: fix ptrace peek/poke for floating point registers
git commit 155e839a814834a3b4b31e729f4716e59d3d2dd4
"s390/kernel: dynamically allocate FP register save area"
introduced a regression in regard to ptrace.
If the vector register extension is not present or unused the
ptrace peek of a floating pointer register return incorrect data
and the ptrace poke to a floating pointer register overwrites the
task structure starting at task->thread.fpu.fprs.
Cc: stable@kernel.org # v4.3
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/ptrace.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c index 3ccd9008a4dc..01c37b36caf9 100644 --- a/arch/s390/kernel/ptrace.c +++ b/arch/s390/kernel/ptrace.c @@ -244,7 +244,7 @@ static unsigned long __peek_user(struct task_struct *child, addr_t addr) ((addr_t) child->thread.fpu.vxrs + 2*offset); else tmp = *(addr_t *) - ((addr_t) &child->thread.fpu.fprs + offset); + ((addr_t) child->thread.fpu.fprs + offset); } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { /* @@ -388,7 +388,7 @@ static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) child->thread.fpu.vxrs + 2*offset) = data; else *(addr_t *)((addr_t) - &child->thread.fpu.fprs + offset) = data; + child->thread.fpu.fprs + offset) = data; } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { /* @@ -622,7 +622,7 @@ static u32 __peek_user_compat(struct task_struct *child, addr_t addr) ((addr_t) child->thread.fpu.vxrs + 2*offset); else tmp = *(__u32 *) - ((addr_t) &child->thread.fpu.fprs + offset); + ((addr_t) child->thread.fpu.fprs + offset); } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { /* @@ -747,7 +747,7 @@ static int __poke_user_compat(struct task_struct *child, child->thread.fpu.vxrs + 2*offset) = tmp; else *(__u32 *)((addr_t) - &child->thread.fpu.fprs + offset) = tmp; + child->thread.fpu.fprs + offset) = tmp; } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { /* |