[REVIEW][PATCH 08/26] signal: Remove task parameter from force_sigsegv

From: Eric W. Biederman
Date: Wed May 22 2019 - 20:43:52 EST

The function force_sigsegv is always called on the current task
so passing in current is redundant and not passing in current
makes this fact obvious.

This also makes it clear force_sigsegv always calls force_sig
on the current task.

Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
---
arch/arc/kernel/process.c | 2 +-
arch/ia64/kernel/signal.c | 6 +++---
arch/nios2/kernel/signal.c | 2 +-
arch/sparc/kernel/signal32.c | 4 ++--
arch/sparc/kernel/signal_64.c | 2 +-
arch/um/kernel/skas/mmu.c | 2 +-
arch/um/kernel/trap.c | 2 +-
arch/unicore32/kernel/signal.c | 2 +-
fs/exec.c | 2 +-
include/linux/sched/signal.h | 2 +-
kernel/rseq.c | 2 +-
kernel/signal.c | 6 ++++--
12 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index 641c364fc232..725e556678a4 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -313,7 +313,7 @@ int elf_check_arch(const struct elf32_hdr *x)
eflags = x->e_flags;
if ((eflags & EF_ARC_OSABI_MSK) != EF_ARC_OSABI_CURRENT) {
pr_err("ABI mismatch - you need newer toolchain\n");
- force_sigsegv(SIGSEGV, current);
+ force_sigsegv(SIGSEGV);
return 0;
}

diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index 6062fd14e34e..518cceb5d4af 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -257,7 +257,7 @@ setup_frame(struct ksignal *ksig, sigset_t *set, struct sigscratch *scr)
*/
check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN;
if (!likely(on_sig_stack(check_sp))) {
- force_sigsegv(ksig->sig, current);
+ force_sigsegv(ksig->sig);
return 1;
}
}
@@ -265,7 +265,7 @@ setup_frame(struct ksignal *ksig, sigset_t *set, struct sigscratch *scr)
frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);

if (!access_ok(frame, sizeof(*frame))) {
- force_sigsegv(ksig->sig, current);
+ force_sigsegv(ksig->sig);
return 1;
}

@@ -282,7 +282,7 @@ setup_frame(struct ksignal *ksig, sigset_t *set, struct sigscratch *scr)
err |= setup_sigcontext(&frame->sc, set, scr);

if (unlikely(err)) {
- force_sigsegv(ksig->sig, current);
+ force_sigsegv(ksig->sig);
return 1;
}

diff --git a/arch/nios2/kernel/signal.c b/arch/nios2/kernel/signal.c
index 4a81876b6086..9bf38531b189 100644
--- a/arch/nios2/kernel/signal.c
+++ b/arch/nios2/kernel/signal.c
@@ -211,7 +211,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
return 0;

give_sigsegv:
- force_sigsegv(ksig->sig, current);
+ force_sigsegv(ksig->sig);
return -EFAULT;
}

diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c
index e800ce13cc6e..fb431d47a532 100644
--- a/arch/sparc/kernel/signal32.c
+++ b/arch/sparc/kernel/signal32.c
@@ -375,7 +375,7 @@ static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
current->comm, current->pid, (unsigned long)sf,
regs->tpc, regs->u_regs[UREG_I7]);
- force_sigsegv(ksig->sig, current);
+ force_sigsegv(ksig->sig);
return -EINVAL;
}

@@ -509,7 +509,7 @@ static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
current->comm, current->pid, (unsigned long)sf,
regs->tpc, regs->u_regs[UREG_I7]);
- force_sigsegv(ksig->sig, current);
+ force_sigsegv(ksig->sig);
return -EINVAL;
}

diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c
index ca70787efd8e..9d50190cf312 100644
--- a/arch/sparc/kernel/signal_64.c
+++ b/arch/sparc/kernel/signal_64.c
@@ -374,7 +374,7 @@ setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
pr_info("%s[%d] bad frame in setup_rt_frame: %016lx TPC %016lx O7 %016lx\n",
current->comm, current->pid, (unsigned long)sf,
regs->tpc, regs->u_regs[UREG_I7]);
- force_sigsegv(ksig->sig, current);
+ force_sigsegv(ksig->sig);
return -EINVAL;
}

diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index 7a1f2a936fd1..29e7f5f9f188 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -119,7 +119,7 @@ void uml_setup_stubs(struct mm_struct *mm)
return;

out:
- force_sigsegv(SIGSEGV, current);
+ force_sigsegv(SIGSEGV);
}

void arch_exit_mmap(struct mm_struct *mm)
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index 0e8b6158f224..646059402ab3 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -169,7 +169,7 @@ static void bad_segv(struct faultinfo fi, unsigned long ip)

void fatal_sigsegv(void)
{
- force_sigsegv(SIGSEGV, current);
+ force_sigsegv(SIGSEGV);
do_signal(&current->thread.regs);
/*
* This is to tell gcc that we're not returning - do_signal
diff --git a/arch/unicore32/kernel/signal.c b/arch/unicore32/kernel/signal.c
index 63be04809d40..75f27dc68bd0 100644
--- a/arch/unicore32/kernel/signal.c
+++ b/arch/unicore32/kernel/signal.c
@@ -386,7 +386,7 @@ static void do_signal(struct pt_regs *regs, int syscall)
regs->UCreg_pc = KERN_RESTART_CODE;
} else {
regs->UCreg_sp += 4;
- force_sigsegv(0, current);
+ force_sigsegv(0);
}
}
if (regs->UCreg_00 == -ERESTARTNOHAND ||
diff --git a/fs/exec.c b/fs/exec.c
index d88584ebf07f..f5568e45d521 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1662,7 +1662,7 @@ int search_binary_handler(struct linux_binprm *bprm)
if (retval < 0 && !bprm->mm) {
/* we got to flush_old_exec() and failed after it */
read_unlock(&binfmt_lock);
- force_sigsegv(SIGSEGV, current);
+ force_sigsegv(SIGSEGV);
return retval;
}
if (retval != -ENOEXEC || !bprm->file) {
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index c68ca81db0a1..8af3101da782 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -325,7 +325,7 @@ int force_sig_pkuerr(void __user *addr, u32 pkey);
int force_sig_ptrace_errno_trap(int errno, void __user *addr);

extern int send_sig_info(int, struct kernel_siginfo *, struct task_struct *);
-extern void force_sigsegv(int sig, struct task_struct *p);
+extern void force_sigsegv(int sig);
extern int force_sig_info(int, struct kernel_siginfo *, struct task_struct *);
extern int __kill_pgrp_info(int sig, struct kernel_siginfo *info, struct pid *pgrp);
extern int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid);
diff --git a/kernel/rseq.c b/kernel/rseq.c
index 9424ee90589e..e1aa3ebee291 100644
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -277,7 +277,7 @@ void __rseq_handle_notify_resume(struct ksignal *ksig, struct pt_regs *regs)

error:
sig = ksig ? ksig->sig : 0;
- force_sigsegv(sig, t);
+ force_sigsegv(sig);
}

#ifdef CONFIG_DEBUG_RSEQ
diff --git a/kernel/signal.c b/kernel/signal.c
index 39a3eca5ce22..f7669d240ce4 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1607,8 +1607,10 @@ EXPORT_SYMBOL(force_sig);
* the problem was already a SIGSEGV, we'll want to
* make sure we don't even try to deliver the signal..
*/
-void force_sigsegv(int sig, struct task_struct *p)
+void force_sigsegv(int sig)
{
+ struct task_struct *p = current;
+
if (sig == SIGSEGV) {
unsigned long flags;
spin_lock_irqsave(&p->sighand->siglock, flags);
@@ -2717,7 +2719,7 @@ static void signal_delivered(struct ksignal *ksig, int stepping)
void signal_setup_done(int failed, struct ksignal *ksig, int stepping)
{
if (failed)
- force_sigsegv(ksig->sig, current);
+ force_sigsegv(ksig->sig);
else
signal_delivered(ksig, stepping);
}
--
2.21.0