diff options
| -rw-r--r-- | arch/s390/include/asm/compat.h | 2 | ||||
| -rw-r--r-- | arch/s390/include/asm/ptrace.h | 4 | ||||
| -rw-r--r-- | arch/s390/kernel/compat_signal.c | 14 | ||||
| -rw-r--r-- | arch/s390/kernel/signal.c | 14 |
4 files changed, 27 insertions, 7 deletions
diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h index 234f1d859cea..2e0a15b4359c 100644 --- 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/asm/ptrace.h b/arch/s390/include/asm/ptrace.h index d5f08ea566ed..f512565cd731 100644 --- a/arch/s390/include/asm/ptrace.h +++ b/arch/s390/include/asm/ptrace.h @@ -238,7 +238,7 @@ 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 @@ -267,7 +267,7 @@ typedef struct #define PSW_MASK_EA 0x0000000100000000UL #define PSW_MASK_BA 0x0000000080000000UL -#define PSW_MASK_USER 0x00003F0180000000UL +#define PSW_MASK_USER 0x0000FF0180000000UL #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 a1e8a8694bb7..593fcc9253fc 100644 --- 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 c13a2a37ef00..d1259d875074 100644 --- 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); |