fix wrong sigaction syscall ABI on mips*, or1k, microblaze, riscv64

we wrongly defined a dummy SA_RESTORER flag on these archs, despite
the kernel interface not actually having such a feature. on archs
which lack SA_RESTORER, the kernel sigaction structure also lacks the
restorer function pointer member, which means the signal mask appears
at a different offset. the kernel was thereby interpreting the bits of
the code address as part of the signal set to be masked while handling
the signal.

this patch removes the erroneous SA_RESTORER definitions from archs
which do not have it, makes access to the member conditional on
whether SA_RESTORER is defined for the arch, and removes the
now-unused asm for the affected archs.

because there are reportedly versions of qemu-user which also use the
wrong ABI here, the old ksigaction struct size is preserved with an
unused member at the end. this is harmless and mitigates the risk of
such a bug turning into a buffer overflow onto the sigaction
function's stack.

arch/microblaze/bits/signal.h

@@ -46,7 +46,6 @@ typedef struct __ucontext {
 #define SA_RESTART    0x10000000
 #define SA_NODEFER    0x40000000
 #define SA_RESETHAND  0x80000000
-#define SA_RESTORER   0x04000000
 
 #endif
 

arch/mips/bits/signal.h

@@ -66,7 +66,6 @@ typedef struct __ucontext {
 #define SA_RESTART    0x10000000
 #define SA_NODEFER    0x40000000
 #define SA_RESETHAND  0x80000000
-#define SA_RESTORER   0x04000000
 
 #undef SIG_BLOCK
 #undef SIG_UNBLOCK

arch/mips/ksigaction.h

@@ -4,10 +4,7 @@ struct k_sigaction {
 	unsigned flags;
 	void (*handler)(int);
 	unsigned long mask[4];
-	/* The following field is past the end of the structure the
-	 * kernel will read or write, and exists only to avoid having
-	 * mips-specific preprocessor conditionals in sigaction.c. */
-	void (*restorer)();
+	void *unused;
 };
 
 hidden void __restore(), __restore_rt();

arch/mips64/bits/signal.h

@@ -85,7 +85,6 @@ typedef struct __ucontext {
 #define SA_RESTART    0x10000000
 #define SA_NODEFER    0x40000000
 #define SA_RESETHAND  0x80000000
-#define SA_RESTORER   0x04000000
 
 #undef SIG_BLOCK
 #undef SIG_UNBLOCK

arch/mips64/ksigaction.h

@@ -4,7 +4,7 @@ struct k_sigaction {
 	unsigned flags;
 	void (*handler)(int);
 	unsigned long mask[2];
-	void (*restorer)();
+	void *unused;
 };
 
 hidden void __restore(), __restore_rt();

arch/mipsn32/bits/signal.h

@@ -85,7 +85,6 @@ typedef struct __ucontext {
 #define SA_RESTART    0x10000000
 #define SA_NODEFER    0x40000000
 #define SA_RESETHAND  0x80000000
-#define SA_RESTORER   0x04000000
 
 #undef SIG_BLOCK
 #undef SIG_UNBLOCK

arch/mipsn32/ksigaction.h

@@ -4,7 +4,7 @@ struct k_sigaction {
 	unsigned flags;
 	void (*handler)(int);
 	unsigned long mask[4];
-	void (*restorer)();
+	void *unused;
 };
 
 hidden void __restore(), __restore_rt();

arch/or1k/bits/signal.h

@@ -43,7 +43,6 @@ typedef struct __ucontext {
 #define SA_RESTART    0x10000000
 #define SA_NODEFER    0x40000000
 #define SA_RESETHAND  0x80000000
-#define SA_RESTORER   0x04000000
 
 #endif
 

arch/riscv64/bits/signal.h

@@ -76,7 +76,6 @@ typedef struct __ucontext
 #define SA_RESTART   0x10000000
 #define SA_NODEFER   0x40000000
 #define SA_RESETHAND 0x80000000
-#define SA_RESTORER  0x04000000
 
 #endif
 

src/internal/ksigaction.h

@@ -6,8 +6,13 @@
 struct k_sigaction {
 	void (*handler)(int);
 	unsigned long flags;
+#ifdef SA_RESTORER
 	void (*restorer)(void);
+#endif
 	unsigned mask[2];
+#ifndef SA_RESTORER
+	void *unused;
+#endif
 };
 
 hidden void __restore(), __restore_rt();

src/signal/mips/restore.s

@@ -1,15 +0,0 @@
-.set noreorder
-
-.global __restore_rt
-.hidden __restore_rt
-.type   __restore_rt,@function
-__restore_rt:
-	li $2, 4193
-	syscall
-
-.global __restore
-.hidden __restore
-.type   __restore,@function
-__restore:
-	li $2, 4119
-	syscall

src/signal/mips64/restore.s

@@ -1,11 +0,0 @@
-.set	noreorder
-.global	__restore_rt
-.global	__restore
-.hidden __restore_rt
-.hidden __restore
-.type	__restore_rt,@function
-.type	__restore,@function
-__restore_rt:
-__restore:
-	li	$2,5211
-	syscall

src/signal/mipsn32/restore.s

@@ -1,11 +0,0 @@
-.set	noreorder
-.global	__restore_rt
-.global	__restore
-.hidden __restore_rt
-.hidden __restore
-.type	__restore_rt,@function
-.type	__restore,@function
-__restore_rt:
-__restore:
-	li	$2,6211
-	syscall

src/signal/sigaction.c

@@ -44,8 +44,11 @@ int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigact
 			}
 		}
 		ksa.handler = sa->sa_handler;
-		ksa.flags = sa->sa_flags | SA_RESTORER;
+		ksa.flags = sa->sa_flags;
+#ifdef SA_RESTORER
+		ksa.flags |= SA_RESTORER;
 		ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
+#endif
 		memcpy(&ksa.mask, &sa->sa_mask, _NSIG/8);
 	}
 	int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8);