cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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signal32.c (2083B)

      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (C) 1991, 1992  Linus Torvalds
      7 * Copyright (C) 1994 - 2000, 2006  Ralf Baechle
      8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
      9 * Copyright (C) 2016, Imagination Technologies Ltd.
     10 */
     11#include <linux/compat.h>
     12#include <linux/compiler.h>
     13#include <linux/errno.h>
     14#include <linux/kernel.h>
     15#include <linux/signal.h>
     16#include <linux/syscalls.h>
     17
     18#include <asm/compat-signal.h>
     19#include <linux/uaccess.h>
     20#include <asm/unistd.h>
     21
     22#include "signal-common.h"
     23
     24/* 32-bit compatibility types */
     25
     26typedef unsigned int __sighandler32_t;
     27typedef void (*vfptr_t)(void);
     28
     29/*
     30 * Atomically swap in the new signal mask, and wait for a signal.
     31 */
     32
     33asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
     34{
     35	return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
     36}
     37
     38SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
     39	struct compat_sigaction __user *, oact)
     40{
     41	struct k_sigaction new_ka, old_ka;
     42	int ret;
     43	int err = 0;
     44
     45	if (act) {
     46		old_sigset_t mask;
     47		s32 handler;
     48
     49		if (!access_ok(act, sizeof(*act)))
     50			return -EFAULT;
     51		err |= __get_user(handler, &act->sa_handler);
     52		new_ka.sa.sa_handler = (void __user *)(s64)handler;
     53		err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
     54		err |= __get_user(mask, &act->sa_mask.sig[0]);
     55		if (err)
     56			return -EFAULT;
     57
     58		siginitset(&new_ka.sa.sa_mask, mask);
     59	}
     60
     61	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
     62
     63	if (!ret && oact) {
     64		if (!access_ok(oact, sizeof(*oact)))
     65			return -EFAULT;
     66		err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
     67		err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
     68				  &oact->sa_handler);
     69		err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
     70		err |= __put_user(0, &oact->sa_mask.sig[1]);
     71		err |= __put_user(0, &oact->sa_mask.sig[2]);
     72		err |= __put_user(0, &oact->sa_mask.sig[3]);
     73		if (err)
     74			return -EFAULT;
     75	}
     76
     77	return ret;
     78}