summaryrefslogtreecommitdiffstats
path: root/arch/s390
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/ptrace.h2
-rw-r--r--arch/s390/kernel/compat_signal.c12
-rw-r--r--arch/s390/kernel/ptrace.c25
-rw-r--r--arch/s390/kernel/signal.c14
4 files changed, 29 insertions, 24 deletions
diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h
index 6fc00d26814..a65846340d5 100644
--- a/arch/s390/include/asm/ptrace.h
+++ b/arch/s390/include/asm/ptrace.h
@@ -269,7 +269,7 @@ typedef struct
#define PSW_MASK_EA 0x0000000100000000UL
#define PSW_MASK_BA 0x0000000080000000UL
-#define PSW_MASK_USER 0x00003F0000000000UL
+#define PSW_MASK_USER 0x00003F0180000000UL
#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 fd83b69207f..a1dc6457016 100644
--- a/arch/s390/kernel/compat_signal.c
+++ b/arch/s390/kernel/compat_signal.c
@@ -302,7 +302,8 @@ static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
regs32.psw.mask = psw32_user_bits |
((__u32)(regs->psw.mask >> 32) & PSW32_MASK_USER);
- regs32.psw.addr = PSW32_ADDR_AMODE | (__u32) regs->psw.addr;
+ regs32.psw.addr = (__u32) regs->psw.addr |
+ (__u32)(regs->psw.mask & PSW_MASK_BA);
for (i = 0; i < NUM_GPRS; i++)
regs32.gprs[i] = (__u32) regs->gprs[i];
save_access_regs(current->thread.acrs);
@@ -328,7 +329,8 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
if (err)
return err;
regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
- (__u64)(regs32.psw.mask & PSW32_MASK_USER) << 32;
+ (__u64)(regs32.psw.mask & PSW32_MASK_USER) << 32 |
+ (__u64)(regs32.psw.addr & PSW32_ADDR_AMODE);
regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
for (i = 0; i < NUM_GPRS; i++)
regs->gprs[i] = (__u64) regs32.gprs[i];
@@ -496,9 +498,9 @@ static int setup_frame32(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) {
- regs->gprs[14] = (__u64) ka->sa.sa_restorer;
+ regs->gprs[14] = (__u64) ka->sa.sa_restorer | PSW32_ADDR_AMODE;
} else {
- regs->gprs[14] = (__u64) frame->retcode;
+ regs->gprs[14] = (__u64) frame->retcode | PSW32_ADDR_AMODE;
if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
(u16 __user *)(frame->retcode)))
goto give_sigsegv;
@@ -510,6 +512,7 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
/* Set up registers for signal handler */
regs->gprs[15] = (__u64) frame;
+ regs->psw.mask |= PSW_MASK_BA; /* force amode 31 */
regs->psw.addr = (__u64) ka->sa.sa_handler;
regs->gprs[2] = map_signal(sig);
@@ -573,6 +576,7 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
/* Set up registers for signal handler */
regs->gprs[15] = (__u64) frame;
+ regs->psw.mask |= PSW_MASK_BA; /* force amode 31 */
regs->psw.addr = (__u64) ka->sa.sa_handler;
regs->gprs[2] = map_signal(sig);
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 41e20763886..450931a45b6 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -170,8 +170,7 @@ static unsigned long __peek_user(struct task_struct *child, addr_t addr)
tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
if (addr == (addr_t) &dummy->regs.psw.mask)
/* Return a clean psw mask. */
- tmp = psw_user_bits | (tmp & PSW_MASK_USER) |
- PSW_MASK_EA | PSW_MASK_BA;
+ tmp = psw_user_bits | (tmp & PSW_MASK_USER);
} else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
/*
@@ -286,26 +285,17 @@ static inline void __poke_user_per(struct task_struct *child,
static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
{
struct user *dummy = NULL;
- addr_t offset, tmp;
+ addr_t offset;
if (addr < (addr_t) &dummy->regs.acrs) {
/*
* psw and gprs are stored on the stack
*/
- tmp = (data & ~PSW_MASK_USER) ^ psw_user_bits;
if (addr == (addr_t) &dummy->regs.psw.mask &&
-#ifdef CONFIG_COMPAT
- tmp != PSW_MASK_BA &&
-#endif
- tmp != (PSW_MASK_EA | PSW_MASK_BA))
+ ((data & ~PSW_MASK_USER) != psw_user_bits ||
+ ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))))
/* Invalid psw mask. */
return -EINVAL;
-#ifndef CONFIG_64BIT
- if (addr == (addr_t) &dummy->regs.psw.addr)
- /* I'd like to reject addresses without the
- high order bit but older gdb's rely on it */
- data |= PSW_ADDR_AMODE;
-#endif
if (addr == (addr_t) &dummy->regs.psw.addr)
/*
* The debugger changed the instruction address,
@@ -517,7 +507,8 @@ static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
tmp = psw32_user_bits | (tmp & PSW32_MASK_USER);
} else if (addr == (addr_t) &dummy32->regs.psw.addr) {
/* Fake a 31 bit psw address. */
- tmp = (__u32) regs->psw.addr | PSW32_ADDR_AMODE;
+ tmp = (__u32) regs->psw.addr |
+ (__u32)(regs->psw.mask & PSW_MASK_BA);
} else {
/* gpr 0-15 */
tmp = *(__u32 *)((addr_t) &regs->psw + addr*2 + 4);
@@ -615,10 +606,14 @@ static int __poke_user_compat(struct task_struct *child,
/* Invalid psw mask. */
return -EINVAL;
regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
+ (regs->psw.mask & PSW_MASK_BA) |
(__u64)(tmp & PSW32_MASK_USER) << 32;
} else if (addr == (addr_t) &dummy32->regs.psw.addr) {
/* Build a 64 bit psw address from 31 bit address. */
regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
+ /* Transfer 31 bit amode bit to psw mask. */
+ regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
+ (__u64)(tmp & PSW32_ADDR_AMODE);
/*
* The debugger changed the instruction address,
* reset system call restart, see signal.c:do_signal
diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index c19755815e5..05a85bc14c9 100644
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -117,8 +117,8 @@ static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
/* Copy a 'clean' PSW mask to the user to avoid leaking
information about whether PER is currently on. */
- user_sregs.regs.psw.mask = psw_user_bits | PSW_MASK_EA | PSW_MASK_BA |
- (regs->psw.mask & PSW_MASK_USER);
+ user_sregs.regs.psw.mask = psw_user_bits |
+ (regs->psw.mask & PSW_MASK_USER);
user_sregs.regs.psw.addr = regs->psw.addr;
memcpy(&user_sregs.regs.gprs, &regs->gprs, sizeof(sregs->regs.gprs));
memcpy(&user_sregs.regs.acrs, current->thread.acrs,
@@ -145,9 +145,13 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs));
if (err)
return err;
+ /* 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);
- regs->psw.addr = PSW_ADDR_AMODE | user_sregs.regs.psw.addr;
+ (user_sregs.regs.psw.mask & PSW_MASK_USER);
+ /* Check for invalid amode */
+ if (regs->psw.mask & PSW_MASK_EA)
+ regs->psw.mask |= PSW_MASK_BA;
+ regs->psw.addr = user_sregs.regs.psw.addr;
memcpy(&regs->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs));
memcpy(&current->thread.acrs, &user_sregs.regs.acrs,
sizeof(sregs->regs.acrs));
@@ -290,6 +294,7 @@ 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 */
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[2] = map_signal(sig);
@@ -358,6 +363,7 @@ 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 */
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[2] = map_signal(sig);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 17:31:10 +0000