s390/signal: switch to using vdso for sigreturn and syscall restart

with generic entry, there's a bug when it comes to restarting of signals.
The failing sequence is:

a) a signal is coming in, and no handler is registered, so the lower
   part of arch_do_signal_or_restart() in arch/s390/kernel/signal.c
   sets PIF_SYSCALL_RESTART.

b) a second signal gets pending while the kernel is still in the exit
   loop, and for that one, a handler exists.

c) The first part of arch_do_signal_or_restart() is called. That part
   calls handle_signal(), which sets up stack + registers for handling
   the signal.

d) __do_syscall() in arch/s390/kernel/syscall.c checks for
   PIF_SYSCALL_RESTART right before leaving to userspace. If it is set,
   it restart's the syscall. However, the registers are already setup
   for handling a signal from c). The syscall is now restarted with the
   wrong arguments.

Change the code to:

- use vdso for syscall_restart() instead of PIF_SYSCALL_RESTART because
  we cannot rewind and go back to userspace on s390 because the system call
  number might be encoded in the svc instruction.
- for all other syscalls we rewind the PSW and return to userspace.

Cc: <stable@kernel.org> # v5.12+ d57778feb987: s390/vdso: always enable vdso
Cc: <stable@kernel.org> # v5.12+ 686341f2548b: s390/vdso64: add sigreturn,rt_sigreturn and restart_syscall
Cc: <stable@kernel.org> # v5.12+ 43e1f76b0b69: s390/vdso: rename VDSO64_LBASE to VDSO_LBASE
Cc: <stable@kernel.org> # v5.12+ 779df2248739: s390/vdso: add minimal compat vdso
Cc: <stable@kernel.org> # v5.12+
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

1 files changed, 18 insertions, 21 deletions

diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index 080e7aed181f..78ef53b29958 100644
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -32,6 +32,7 @@
 #include <linux/uaccess.h>
 #include <asm/lowcore.h>
 #include <asm/switch_to.h>
+#include <asm/vdso.h>
 #include "entry.h"
 
 /*
@@ -171,7 +172,6 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
 	fpregs_load(&user_sregs.fpregs, &current->thread.fpu);
 
 	clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
-	clear_pt_regs_flag(regs, PIF_SYSCALL_RESTART);
 	return 0;
 }
 
@@ -334,15 +334,10 @@ static int setup_frame(int sig, struct k_sigaction *ka,
 
 	/* Set up to return from userspace.  If provided, use a stub
 	   already in userspace.  */
-	if (ka->sa.sa_flags & SA_RESTORER) {
+	if (ka->sa.sa_flags & SA_RESTORER)
 		restorer = (unsigned long) ka->sa.sa_restorer;
-	} else {
-		/* Signal frame without vector registers are short ! */
-		__u16 __user *svc = (void __user *) frame + frame_size - 2;
-		if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, svc))
-			return -EFAULT;
-		restorer = (unsigned long) svc;
-	}
+	else
+		restorer = VDSO64_SYMBOL(current, sigreturn);
 
 	/* Set up registers for signal handler */
 	regs->gprs[14] = restorer;
@@ -397,14 +392,10 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 
 	/* Set up to return from userspace.  If provided, use a stub
 	   already in userspace.  */
-	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+	if (ksig->ka.sa.sa_flags & SA_RESTORER)
 		restorer = (unsigned long) ksig->ka.sa.sa_restorer;
-	} else {
-		__u16 __user *svc = &frame->svc_insn;
-		if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, svc))
-			return -EFAULT;
-		restorer = (unsigned long) svc;
-	}
+	else
+		restorer = VDSO64_SYMBOL(current, rt_sigreturn);
 
 	/* Create siginfo on the signal stack */
 	if (copy_siginfo_to_user(&frame->info, &ksig->info))
@@ -501,7 +492,7 @@ void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal)
 		}
 		/* No longer in a system call */
 		clear_pt_regs_flag(regs, PIF_SYSCALL);
-		clear_pt_regs_flag(regs, PIF_SYSCALL_RESTART);
+
 		rseq_signal_deliver(&ksig, regs);
 		if (is_compat_task())
 			handle_signal32(&ksig, oldset, regs);
@@ -517,14 +508,20 @@ void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal)
 		switch (regs->gprs[2]) {
 		case -ERESTART_RESTARTBLOCK:
 			/* Restart with sys_restart_syscall */
-			regs->int_code = __NR_restart_syscall;
-			fallthrough;
+			regs->gprs[2] = regs->orig_gpr2;
+			current->restart_block.arch_data = regs->psw.addr;
+			if (is_compat_task())
+				regs->psw.addr = VDSO32_SYMBOL(current, restart_syscall);
+			else
+				regs->psw.addr = VDSO64_SYMBOL(current, restart_syscall);
+			if (test_thread_flag(TIF_SINGLE_STEP))
+				clear_thread_flag(TIF_PER_TRAP);
+			break;
 		case -ERESTARTNOHAND:
 		case -ERESTARTSYS:
 		case -ERESTARTNOINTR:
-			/* Restart system call with magic TIF bit. */
 			regs->gprs[2] = regs->orig_gpr2;
-			set_pt_regs_flag(regs, PIF_SYSCALL_RESTART);
+			regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
 			if (test_thread_flag(TIF_SINGLE_STEP))
 				clear_thread_flag(TIF_PER_TRAP);
 			break;