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authorSven Schnelle <svens@linux.ibm.com>2021-06-25 15:06:06 +0200
committerVasily Gorbik <gor@linux.ibm.com>2021-07-08 22:12:17 +0200
commitfbf50f47ea99d07aec59859027352d4837e84ce1 (patch)
tree1d8aae4f639d404a5619c0739485002bde932f4c /arch
parentdf29a7440c4b5c65765c8f60396b3b13063e24e9 (diff)
s390/signal: remove sigreturn on stack
{rt_}sigreturn is now called from the vdso, so we no longer need the svc on the stack, and therefore no hack to support that mechanism on machines with non-executable stack. 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>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/include/asm/entry-common.h1
-rw-r--r--arch/s390/kernel/syscall.c2
-rw-r--r--arch/s390/kernel/traps.c12
-rw-r--r--arch/s390/mm/fault.c23
4 files changed, 2 insertions, 36 deletions
diff --git a/arch/s390/include/asm/entry-common.h b/arch/s390/include/asm/entry-common.h
index baa8005090c3..17aead80aadb 100644
--- a/arch/s390/include/asm/entry-common.h
+++ b/arch/s390/include/asm/entry-common.h
@@ -14,7 +14,6 @@
#define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_GUARDED_STORAGE | _TIF_PER_TRAP)
void do_per_trap(struct pt_regs *regs);
-void do_syscall(struct pt_regs *regs);
#ifdef CONFIG_DEBUG_ENTRY
static __always_inline void arch_check_user_regs(struct pt_regs *regs)
diff --git a/arch/s390/kernel/syscall.c b/arch/s390/kernel/syscall.c
index c6b99da0738b..ec73d2c61e58 100644
--- a/arch/s390/kernel/syscall.c
+++ b/arch/s390/kernel/syscall.c
@@ -108,7 +108,7 @@ SYSCALL_DEFINE0(ni_syscall)
return -ENOSYS;
}
-void do_syscall(struct pt_regs *regs)
+static void do_syscall(struct pt_regs *regs)
{
unsigned long nr;
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 3a6d08d6df6f..76947275fe8b 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -301,10 +301,9 @@ static void (*pgm_check_table[128])(struct pt_regs *regs);
void noinstr __do_pgm_check(struct pt_regs *regs)
{
unsigned long last_break = S390_lowcore.breaking_event_addr;
- unsigned int trapnr, syscall_redirect = 0;
+ unsigned int trapnr;
irqentry_state_t state;
- add_random_kstack_offset();
regs->int_code = *(u32 *)&S390_lowcore.pgm_ilc;
regs->int_parm_long = S390_lowcore.trans_exc_code;
@@ -346,18 +345,9 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
trapnr = regs->int_code & PGM_INT_CODE_MASK;
if (trapnr)
pgm_check_table[trapnr](regs);
- syscall_redirect = user_mode(regs) && test_pt_regs_flag(regs, PIF_SYSCALL);
out:
local_irq_disable();
irqentry_exit(regs, state);
-
- if (syscall_redirect) {
- enter_from_user_mode(regs);
- local_irq_enable();
- regs->orig_gpr2 = regs->gprs[2];
- do_syscall(regs);
- exit_to_user_mode();
- }
}
/*
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 18b6212bd449..e33c43b38afe 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -285,26 +285,6 @@ static noinline void do_sigbus(struct pt_regs *regs)
(void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK));
}
-static noinline int signal_return(struct pt_regs *regs)
-{
- u16 instruction;
- int rc;
-
- rc = __get_user(instruction, (u16 __user *) regs->psw.addr);
- if (rc)
- return rc;
- if (instruction == 0x0a77) {
- set_pt_regs_flag(regs, PIF_SYSCALL);
- regs->int_code = 0x00040077;
- return 0;
- } else if (instruction == 0x0aad) {
- set_pt_regs_flag(regs, PIF_SYSCALL);
- regs->int_code = 0x000400ad;
- return 0;
- }
- return -EACCES;
-}
-
static noinline void do_fault_error(struct pt_regs *regs, int access,
vm_fault_t fault)
{
@@ -312,9 +292,6 @@ static noinline void do_fault_error(struct pt_regs *regs, int access,
switch (fault) {
case VM_FAULT_BADACCESS:
- if (access == VM_EXEC && signal_return(regs) == 0)
- break;
- fallthrough;
case VM_FAULT_BADMAP:
/* Bad memory access. Check if it is kernel or user space. */
if (user_mode(regs)) {