From: Oleg Nesterov Date: Tue, 17 Jul 2007 21:37:54 +0000 (-0700) Subject: [SPARC64]: Kill bogus set_fs(KERNEL_DS) in do_rt_sigreturn(). X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=62715ec832c7229b677415901e98799124efb023;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [SPARC64]: Kill bogus set_fs(KERNEL_DS) in do_rt_sigreturn(). From: Oleg Nesterov Signed-off-by: David S. Miller --- diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c index 203e87301005..fb13775b3682 100644 --- a/arch/sparc64/kernel/signal.c +++ b/arch/sparc64/kernel/signal.c @@ -289,9 +289,7 @@ void do_rt_sigreturn(struct pt_regs *regs) struct rt_signal_frame __user *sf; unsigned long tpc, tnpc, tstate; __siginfo_fpu_t __user *fpu_save; - mm_segment_t old_fs; sigset_t set; - stack_t st; int err; /* Always make any pending restarted system calls return -EINTR */ @@ -327,20 +325,13 @@ void do_rt_sigreturn(struct pt_regs *regs) err |= restore_fpu_state(regs, &sf->fpu_state); err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); - err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); - + err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf); + if (err) goto segv; - + regs->tpc = tpc; regs->tnpc = tnpc; - - /* It is more difficult to avoid calling this function than to - call it and ignore errors. */ - old_fs = get_fs(); - set_fs(KERNEL_DS); - do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); - set_fs(old_fs); sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock);