s390/signal: set correct address space control

If user space is running in primary mode it can switch to secondary
or access register mode, this is used e.g. in the clock_gettime code
of the vdso. If a signal is delivered to the user space process while
it has been running in access register mode the signal handler is
executed in access register mode as well which will result in a crash
most of the time.

Set the address space control bits in the PSW to the default for the
execution of the signal handler and make sure that the previous
address space control is restored on signal return. Take care
that user space can not switch to the kernel address space by
modifying the registers in the signal frame.

Cc: stable@vger.kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h
index a34a9d6..18cd6b5 100644 (file)
--- a/arch/s390/include/asm/compat.h
+++ b/arch/s390/include/asm/compat.h
@@ -20,7 +20,7 @@
 #define PSW32_MASK_CC          0x00003000UL
 #define PSW32_MASK_PM          0x00000f00UL
 
-#define PSW32_MASK_USER                0x00003F00UL
+#define PSW32_MASK_USER                0x0000FF00UL
 
 #define PSW32_ADDR_AMODE       0x80000000UL
 #define PSW32_ADDR_INSN                0x7FFFFFFFUL

diff --git a/arch/s390/include/uapi/asm/ptrace.h b/arch/s390/include/uapi/asm/ptrace.h
index 705588a..a5ca214 100644 (file)
--- a/arch/s390/include/uapi/asm/ptrace.h
+++ b/arch/s390/include/uapi/asm/ptrace.h
@@ -239,7 +239,7 @@ typedef struct
 #define PSW_MASK_EA            0x00000000UL
 #define PSW_MASK_BA            0x00000000UL
 
-#define PSW_MASK_USER          0x00003F00UL
+#define PSW_MASK_USER          0x0000FF00UL
 
 #define PSW_ADDR_AMODE         0x80000000UL
 #define PSW_ADDR_INSN          0x7FFFFFFFUL
@@ -269,7 +269,7 @@ typedef struct
 #define PSW_MASK_EA            0x0000000100000000UL
 #define PSW_MASK_BA            0x0000000080000000UL
 
-#define PSW_MASK_USER          0x00003F8180000000UL
+#define PSW_MASK_USER          0x0000FF8180000000UL
 
 #define PSW_ADDR_AMODE         0x0000000000000000UL
 #define PSW_ADDR_INSN          0xFFFFFFFFFFFFFFFFUL

diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c
index a1e8a86..593fcc9 100644 (file)
--- a/arch/s390/kernel/compat_signal.c
+++ b/arch/s390/kernel/compat_signal.c
@@ -309,6 +309,10 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
        regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
                (__u64)(regs32.psw.mask & PSW32_MASK_USER) << 32 |
                (__u64)(regs32.psw.addr & PSW32_ADDR_AMODE);
+       /* Check for invalid user address space control. */
+       if ((regs->psw.mask & PSW_MASK_ASC) >= (psw_kernel_bits & PSW_MASK_ASC))
+               regs->psw.mask = (psw_user_bits & PSW_MASK_ASC) |
+                       (regs->psw.mask & ~PSW_MASK_ASC);
        regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
        for (i = 0; i < NUM_GPRS; i++)
                regs->gprs[i] = (__u64) regs32.gprs[i];
@@ -481,7 +485,10 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
 
        /* Set up registers for signal handler */
        regs->gprs[15] = (__force __u64) frame;
-       regs->psw.mask |= PSW_MASK_BA;          /* force amode 31 */
+       /* Force 31 bit amode and default user address space control. */
+       regs->psw.mask = PSW_MASK_BA |
+               (psw_user_bits & PSW_MASK_ASC) |
+               (regs->psw.mask & ~PSW_MASK_ASC);
        regs->psw.addr = (__force __u64) ka->sa.sa_handler;
 
        regs->gprs[2] = map_signal(sig);
@@ -549,7 +556,10 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
 
        /* Set up registers for signal handler */
        regs->gprs[15] = (__force __u64) frame;
-       regs->psw.mask |= PSW_MASK_BA;          /* force amode 31 */
+       /* Force 31 bit amode and default user address space control. */
+       regs->psw.mask = PSW_MASK_BA |
+               (psw_user_bits & PSW_MASK_ASC) |
+               (regs->psw.mask & ~PSW_MASK_ASC);
        regs->psw.addr = (__u64) ka->sa.sa_handler;
 
        regs->gprs[2] = map_signal(sig);

diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index c13a2a3..d1259d8 100644 (file)
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -136,6 +136,10 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
        /* Use regs->psw.mask instead of psw_user_bits to preserve PER bit. */
        regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
                (user_sregs.regs.psw.mask & PSW_MASK_USER);
+       /* Check for invalid user address space control. */
+       if ((regs->psw.mask & PSW_MASK_ASC) >= (psw_kernel_bits & PSW_MASK_ASC))
+               regs->psw.mask = (psw_user_bits & PSW_MASK_ASC) |
+                       (regs->psw.mask & ~PSW_MASK_ASC);
        /* Check for invalid amode */
        if (regs->psw.mask & PSW_MASK_EA)
                regs->psw.mask |= PSW_MASK_BA;
@@ -273,7 +277,10 @@ static int setup_frame(int sig, struct k_sigaction *ka,
 
        /* Set up registers for signal handler */
        regs->gprs[15] = (unsigned long) frame;
-       regs->psw.mask |= PSW_MASK_EA | PSW_MASK_BA;    /* 64 bit amode */
+       /* Force default amode and default user address space control. */
+       regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
+               (psw_user_bits & PSW_MASK_ASC) |
+               (regs->psw.mask & ~PSW_MASK_ASC);
        regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
 
        regs->gprs[2] = map_signal(sig);
@@ -346,7 +353,10 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 
        /* Set up registers for signal handler */
        regs->gprs[15] = (unsigned long) frame;
-       regs->psw.mask |= PSW_MASK_EA | PSW_MASK_BA;    /* 64 bit amode */
+       /* Force default amode and default user address space control. */
+       regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
+               (psw_user_bits & PSW_MASK_ASC) |
+               (regs->psw.mask & ~PSW_MASK_ASC);
        regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
 
        regs->gprs[2] = map_signal(sig);