x86/signal/64: Move 64-bit signal code to its own file

  [ bp: Fixup merge conflict caused by changes coming from the kbuild tree. ]

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Link: https://lore.kernel.org/r/20220606203802.158958-9-brgerst@gmail.com
Signed-off-by: Borislav Petkov <bp@suse.de>

1 files changed, 0 insertions, 376 deletions

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 962cfd835c90..1504eb8d25aa 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -37,13 +37,6 @@
 #include <asm/sighandling.h>
 #include <asm/vm86.h>
 
-#ifdef CONFIG_X86_64
-#include <linux/compat.h>
-#include <asm/proto.h>
-#include <asm/ia32_unistd.h>
-#include <asm/fpu/xstate.h>
-#endif /* CONFIG_X86_64 */
-
 #include <asm/syscall.h>
 #include <asm/sigframe.h>
 #include <asm/signal.h>
@@ -65,135 +58,6 @@ static inline int is_x32_frame(struct ksignal *ksig)
 		ksig->ka.sa.sa_flags & SA_X32_ABI;
 }
 
-#ifdef CONFIG_X86_64
-/*
- * If regs->ss will cause an IRET fault, change it.  Otherwise leave it
- * alone.  Using this generally makes no sense unless
- * user_64bit_mode(regs) would return true.
- */
-static void force_valid_ss(struct pt_regs *regs)
-{
-	u32 ar;
-	asm volatile ("lar %[old_ss], %[ar]\n\t"
-		      "jz 1f\n\t"		/* If invalid: */
-		      "xorl %[ar], %[ar]\n\t"	/* set ar = 0 */
-		      "1:"
-		      : [ar] "=r" (ar)
-		      : [old_ss] "rm" ((u16)regs->ss));
-
-	/*
-	 * For a valid 64-bit user context, we need DPL 3, type
-	 * read-write data or read-write exp-down data, and S and P
-	 * set.  We can't use VERW because VERW doesn't check the
-	 * P bit.
-	 */
-	ar &= AR_DPL_MASK | AR_S | AR_P | AR_TYPE_MASK;
-	if (ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA) &&
-	    ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA_EXPDOWN))
-		regs->ss = __USER_DS;
-}
-
-static bool restore_sigcontext(struct pt_regs *regs,
-			       struct sigcontext __user *usc,
-			       unsigned long uc_flags)
-{
-	struct sigcontext sc;
-
-	/* Always make any pending restarted system calls return -EINTR */
-	current->restart_block.fn = do_no_restart_syscall;
-
-	if (copy_from_user(&sc, usc, offsetof(struct sigcontext, reserved1)))
-		return false;
-
-	regs->bx = sc.bx;
-	regs->cx = sc.cx;
-	regs->dx = sc.dx;
-	regs->si = sc.si;
-	regs->di = sc.di;
-	regs->bp = sc.bp;
-	regs->ax = sc.ax;
-	regs->sp = sc.sp;
-	regs->ip = sc.ip;
-	regs->r8 = sc.r8;
-	regs->r9 = sc.r9;
-	regs->r10 = sc.r10;
-	regs->r11 = sc.r11;
-	regs->r12 = sc.r12;
-	regs->r13 = sc.r13;
-	regs->r14 = sc.r14;
-	regs->r15 = sc.r15;
-
-	/* Get CS/SS and force CPL3 */
-	regs->cs = sc.cs | 0x03;
-	regs->ss = sc.ss | 0x03;
-
-	regs->flags = (regs->flags & ~FIX_EFLAGS) | (sc.flags & FIX_EFLAGS);
-	/* disable syscall checks */
-	regs->orig_ax = -1;
-
-	/*
-	 * Fix up SS if needed for the benefit of old DOSEMU and
-	 * CRIU.
-	 */
-	if (unlikely(!(uc_flags & UC_STRICT_RESTORE_SS) && user_64bit_mode(regs)))
-		force_valid_ss(regs);
-
-	return fpu__restore_sig((void __user *)sc.fpstate, 0);
-}
-
-static __always_inline int
-__unsafe_setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
-		     struct pt_regs *regs, unsigned long mask)
-{
-	unsafe_put_user(regs->di, &sc->di, Efault);
-	unsafe_put_user(regs->si, &sc->si, Efault);
-	unsafe_put_user(regs->bp, &sc->bp, Efault);
-	unsafe_put_user(regs->sp, &sc->sp, Efault);
-	unsafe_put_user(regs->bx, &sc->bx, Efault);
-	unsafe_put_user(regs->dx, &sc->dx, Efault);
-	unsafe_put_user(regs->cx, &sc->cx, Efault);
-	unsafe_put_user(regs->ax, &sc->ax, Efault);
-	unsafe_put_user(regs->r8, &sc->r8, Efault);
-	unsafe_put_user(regs->r9, &sc->r9, Efault);
-	unsafe_put_user(regs->r10, &sc->r10, Efault);
-	unsafe_put_user(regs->r11, &sc->r11, Efault);
-	unsafe_put_user(regs->r12, &sc->r12, Efault);
-	unsafe_put_user(regs->r13, &sc->r13, Efault);
-	unsafe_put_user(regs->r14, &sc->r14, Efault);
-	unsafe_put_user(regs->r15, &sc->r15, Efault);
-
-	unsafe_put_user(current->thread.trap_nr, &sc->trapno, Efault);
-	unsafe_put_user(current->thread.error_code, &sc->err, Efault);
-	unsafe_put_user(regs->ip, &sc->ip, Efault);
-	unsafe_put_user(regs->flags, &sc->flags, Efault);
-	unsafe_put_user(regs->cs, &sc->cs, Efault);
-	unsafe_put_user(0, &sc->gs, Efault);
-	unsafe_put_user(0, &sc->fs, Efault);
-	unsafe_put_user(regs->ss, &sc->ss, Efault);
-
-	unsafe_put_user(fpstate, (unsigned long __user *)&sc->fpstate, Efault);
-
-	/* non-iBCS2 extensions.. */
-	unsafe_put_user(mask, &sc->oldmask, Efault);
-	unsafe_put_user(current->thread.cr2, &sc->cr2, Efault);
-	return 0;
-Efault:
-	return -EFAULT;
-}
-
-#define unsafe_put_sigcontext(sc, fp, regs, set, label)			\
-do {									\
-	if (__unsafe_setup_sigcontext(sc, fp, regs, set->sig[0]))	\
-		goto label;						\
-} while(0);
-
-#define unsafe_put_sigmask(set, frame, label) \
-	unsafe_put_user(*(__u64 *)(set), \
-			(__u64 __user *)&(frame)->uc.uc_sigmask, \
-			label)
-
-#endif /* CONFIG_X86_64 */
-
 /*
  * Set up a signal frame.
  */
@@ -279,213 +143,6 @@ get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size,
 	return (void __user *)sp;
 }
 
-#ifdef CONFIG_X86_64
-static unsigned long frame_uc_flags(struct pt_regs *regs)
-{
-	unsigned long flags;
-
-	if (boot_cpu_has(X86_FEATURE_XSAVE))
-		flags = UC_FP_XSTATE | UC_SIGCONTEXT_SS;
-	else
-		flags = UC_SIGCONTEXT_SS;
-
-	if (likely(user_64bit_mode(regs)))
-		flags |= UC_STRICT_RESTORE_SS;
-
-	return flags;
-}
-
-int x64_setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
-{
-	sigset_t *set = sigmask_to_save();
-	struct rt_sigframe __user *frame;
-	void __user *fp = NULL;
-	unsigned long uc_flags;
-
-	/* x86-64 should always use SA_RESTORER. */
-	if (!(ksig->ka.sa.sa_flags & SA_RESTORER))
-		return -EFAULT;
-
-	frame = get_sigframe(ksig, regs, sizeof(struct rt_sigframe), &fp);
-	uc_flags = frame_uc_flags(regs);
-
-	if (!user_access_begin(frame, sizeof(*frame)))
-		return -EFAULT;
-
-	/* Create the ucontext.  */
-	unsafe_put_user(uc_flags, &frame->uc.uc_flags, Efault);
-	unsafe_put_user(0, &frame->uc.uc_link, Efault);
-	unsafe_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
-
-	/* Set up to return from userspace.  If provided, use a stub
-	   already in userspace.  */
-	unsafe_put_user(ksig->ka.sa.sa_restorer, &frame->pretcode, Efault);
-	unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
-	unsafe_put_sigmask(set, frame, Efault);
-	user_access_end();
-
-	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
-		if (copy_siginfo_to_user(&frame->info, &ksig->info))
-			return -EFAULT;
-	}
-
-	/* Set up registers for signal handler */
-	regs->di = ksig->sig;
-	/* In case the signal handler was declared without prototypes */
-	regs->ax = 0;
-
-	/* This also works for non SA_SIGINFO handlers because they expect the
-	   next argument after the signal number on the stack. */
-	regs->si = (unsigned long)&frame->info;
-	regs->dx = (unsigned long)&frame->uc;
-	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
-
-	regs->sp = (unsigned long)frame;
-
-	/*
-	 * Set up the CS and SS registers to run signal handlers in
-	 * 64-bit mode, even if the handler happens to be interrupting
-	 * 32-bit or 16-bit code.
-	 *
-	 * SS is subtle.  In 64-bit mode, we don't need any particular
-	 * SS descriptor, but we do need SS to be valid.  It's possible
-	 * that the old SS is entirely bogus -- this can happen if the
-	 * signal we're trying to deliver is #GP or #SS caused by a bad
-	 * SS value.  We also have a compatibility issue here: DOSEMU
-	 * relies on the contents of the SS register indicating the
-	 * SS value at the time of the signal, even though that code in
-	 * DOSEMU predates sigreturn's ability to restore SS.  (DOSEMU
-	 * avoids relying on sigreturn to restore SS; instead it uses
-	 * a trampoline.)  So we do our best: if the old SS was valid,
-	 * we keep it.  Otherwise we replace it.
-	 */
-	regs->cs = __USER_CS;
-
-	if (unlikely(regs->ss != __USER_DS))
-		force_valid_ss(regs);
-
-	return 0;
-
-Efault:
-	user_access_end();
-	return -EFAULT;
-}
-
-#ifdef CONFIG_X86_X32_ABI
-static int x32_copy_siginfo_to_user(struct compat_siginfo __user *to,
-		const struct kernel_siginfo *from)
-{
-	struct compat_siginfo new;
-
-	copy_siginfo_to_external32(&new, from);
-	if (from->si_signo == SIGCHLD) {
-		new._sifields._sigchld_x32._utime = from->si_utime;
-		new._sifields._sigchld_x32._stime = from->si_stime;
-	}
-	if (copy_to_user(to, &new, sizeof(struct compat_siginfo)))
-		return -EFAULT;
-	return 0;
-}
-
-int copy_siginfo_to_user32(struct compat_siginfo __user *to,
-			   const struct kernel_siginfo *from)
-{
-	if (in_x32_syscall())
-		return x32_copy_siginfo_to_user(to, from);
-	return __copy_siginfo_to_user32(to, from);
-}
-
-int x32_setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
-{
-	compat_sigset_t *set = (compat_sigset_t *) sigmask_to_save();
-	struct rt_sigframe_x32 __user *frame;
-	unsigned long uc_flags;
-	void __user *restorer;
-	void __user *fp = NULL;
-
-	if (!(ksig->ka.sa.sa_flags & SA_RESTORER))
-		return -EFAULT;
-
-	frame = get_sigframe(ksig, regs, sizeof(*frame), &fp);
-
-	uc_flags = frame_uc_flags(regs);
-
-	if (!user_access_begin(frame, sizeof(*frame)))
-		return -EFAULT;
-
-	/* Create the ucontext.  */
-	unsafe_put_user(uc_flags, &frame->uc.uc_flags, Efault);
-	unsafe_put_user(0, &frame->uc.uc_link, Efault);
-	unsafe_compat_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
-	unsafe_put_user(0, &frame->uc.uc__pad0, Efault);
-	restorer = ksig->ka.sa.sa_restorer;
-	unsafe_put_user(restorer, (unsigned long __user *)&frame->pretcode, Efault);
-	unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
-	unsafe_put_sigmask(set, frame, Efault);
-	user_access_end();
-
-	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
-		if (x32_copy_siginfo_to_user(&frame->info, &ksig->info))
-			return -EFAULT;
-	}
-
-	/* Set up registers for signal handler */
-	regs->sp = (unsigned long) frame;
-	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
-
-	/* We use the x32 calling convention here... */
-	regs->di = ksig->sig;
-	regs->si = (unsigned long) &frame->info;
-	regs->dx = (unsigned long) &frame->uc;
-
-	loadsegment(ds, __USER_DS);
-	loadsegment(es, __USER_DS);
-
-	regs->cs = __USER_CS;
-	regs->ss = __USER_DS;
-
-	return 0;
-
-Efault:
-	user_access_end();
-	return -EFAULT;
-}
-#endif /* CONFIG_X86_X32_ABI */
-
-/*
- * Do a signal return; undo the signal stack.
- */
-SYSCALL_DEFINE0(rt_sigreturn)
-{
-	struct pt_regs *regs = current_pt_regs();
-	struct rt_sigframe __user *frame;
-	sigset_t set;
-	unsigned long uc_flags;
-
-	frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
-	if (!access_ok(frame, sizeof(*frame)))
-		goto badframe;
-	if (__get_user(*(__u64 *)&set, (__u64 __user *)&frame->uc.uc_sigmask))
-		goto badframe;
-	if (__get_user(uc_flags, &frame->uc.uc_flags))
-		goto badframe;
-
-	set_current_blocked(&set);
-
-	if (!restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
-		goto badframe;
-
-	if (restore_altstack(&frame->uc.uc_stack))
-		goto badframe;
-
-	return regs->ax;
-
-badframe:
-	signal_fault(regs, frame, "rt_sigreturn");
-	return 0;
-}
-#endif /* CONFIG_X86_64 */
-
 /*
  * There are four different struct types for signal frame: sigframe_ia32,
  * rt_sigframe_ia32, rt_sigframe_x32, and rt_sigframe. Use the worst case
@@ -749,36 +406,3 @@ bool sigaltstack_size_valid(size_t ss_size)
 	return true;
 }
 #endif /* CONFIG_DYNAMIC_SIGFRAME */
-
-#ifdef CONFIG_X86_X32_ABI
-COMPAT_SYSCALL_DEFINE0(x32_rt_sigreturn)
-{
-	struct pt_regs *regs = current_pt_regs();
-	struct rt_sigframe_x32 __user *frame;
-	sigset_t set;
-	unsigned long uc_flags;
-
-	frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
-
-	if (!access_ok(frame, sizeof(*frame)))
-		goto badframe;
-	if (__get_user(set.sig[0], (__u64 __user *)&frame->uc.uc_sigmask))
-		goto badframe;
-	if (__get_user(uc_flags, &frame->uc.uc_flags))
-		goto badframe;
-
-	set_current_blocked(&set);
-
-	if (!restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
-		goto badframe;
-
-	if (compat_restore_altstack(&frame->uc.uc_stack))
-		goto badframe;
-
-	return regs->ax;
-
-badframe:
-	signal_fault(regs, frame, "x32 rt_sigreturn");
-	return 0;
-}
-#endif