From: "Maciej W. Rozycki" macro@mips.com
This patch has been added to the 4.1 stable tree. If you have any objections, please let us know.
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[ Upstream commit 006501e039eec411842bb3150c41358867d320c2 ]
Complement commit d614fd58a283 ("mips/ptrace: Preserve previous registers for short regset write") and like with the PTRACE_GETREGSET ptrace(2) request also apply a BUILD_BUG_ON check for the size of the `elf_fpreg_t' type in the PTRACE_SETREGSET request handler.
Signed-off-by: Maciej W. Rozycki macro@mips.com Fixes: d614fd58a283 ("mips/ptrace: Preserve previous registers for short regset write") Cc: James Hogan james.hogan@mips.com Cc: Paul Burton Paul.Burton@mips.com Cc: Alex Smith alex@alex-smith.me.uk Cc: Dave Martin Dave.Martin@arm.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org # v4.11+ Patchwork: https://patchwork.linux-mips.org/patch/17929/ Signed-off-by: Ralf Baechle ralf@linux-mips.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- arch/mips/kernel/ptrace.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index 57f217c90d72..9356f9d7bd0e 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -466,6 +466,7 @@ static int fpr_get_msa(struct task_struct *target, u64 fpr_val; int err;
+ BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t)); for (i = 0; i < NUM_FPU_REGS; i++) { fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0); err = user_regset_copyout(pos, count, kbuf, ubuf,