arm64: signal: Make force_signal_inject more robust

force_signal_inject is a little flakey:

  * It only knows about SIGILL and SIGSEGV, so can potentially deliver
    other signals based on a partially initialised siginfo_t

  * It sets si_addr to point at the PC for SIGSEGV

  * It always operates on current, so doesn't need the regs argument

This patch fixes these issues by always assigning the si_addr field to
the address parameter of the function and updates the callers (including
those that indirectly call via arm64_notify_segfault) accordingly.

Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/include/asm/traps.h b/arch/arm64/include/asm/traps.h
index 178e338..1ee63dc 100644 (file)
--- a/arch/arm64/include/asm/traps.h
+++ b/arch/arm64/include/asm/traps.h
@@ -35,10 +35,8 @@ struct undef_hook {
 
 void register_undef_hook(struct undef_hook *hook);
 void unregister_undef_hook(struct undef_hook *hook);
-void force_signal_inject(int signal, int code, struct pt_regs *regs,
-                        unsigned long address);
-
-void arm64_notify_segfault(struct pt_regs *regs, unsigned long addr);
+void force_signal_inject(int signal, int code, unsigned long address);
+void arm64_notify_segfault(unsigned long addr);
 
 /*
  * Move regs->pc to next instruction and do necessary setup before it

diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
index 68450e9..6e47fc3 100644 (file)
--- a/arch/arm64/kernel/armv8_deprecated.c
+++ b/arch/arm64/kernel/armv8_deprecated.c
@@ -429,7 +429,7 @@ ret:
 
 fault:
        pr_debug("SWP{B} emulation: access caused memory abort!\n");
-       arm64_notify_segfault(regs, address);
+       arm64_notify_segfault(address);
 
        return 0;
 }

diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index e7226c4..6964ff8 100644 (file)
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -285,8 +285,7 @@ static void task_fpsimd_save(void)
                                 * re-enter user with corrupt state.
                                 * There's no way to recover, so kill it:
                                 */
-                               force_signal_inject(
-                                       SIGKILL, 0, current_pt_regs(), 0);
+                               force_signal_inject(SIGKILL, 0, 0);
                                return;
                        }
 
@@ -831,7 +830,7 @@ asmlinkage void do_sve_acc(unsigned int esr, struct pt_regs *regs)
 {
        /* Even if we chose not to use SVE, the hardware could still trap: */
        if (unlikely(!system_supports_sve()) || WARN_ON(is_compat_task())) {
-               force_signal_inject(SIGILL, ILL_ILLOPC, regs, 0);
+               force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
                return;
        }
 

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index eb2d151..c478d8e 100644 (file)
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -311,12 +311,13 @@ exit:
        return fn ? fn(regs, instr) : 1;
 }
 
-void force_signal_inject(int signal, int code, struct pt_regs *regs,
-                        unsigned long address)
+void force_signal_inject(int signal, int code, unsigned long address)
 {
        siginfo_t info;
-       void __user *pc = (void __user *)instruction_pointer(regs);
        const char *desc;
+       struct pt_regs *regs = current_pt_regs();
+
+       clear_siginfo(&info);
 
        switch (signal) {
        case SIGILL:
@@ -332,15 +333,15 @@ void force_signal_inject(int signal, int code, struct pt_regs *regs,
 
        if (unhandled_signal(current, signal) &&
            show_unhandled_signals_ratelimited()) {
-               pr_info("%s[%d]: %s: pc=%p\n",
-                       current->comm, task_pid_nr(current), desc, pc);
+               pr_info("%s[%d]: %s: pc=%08llx\n",
+                       current->comm, task_pid_nr(current), desc, regs->pc);
                dump_instr(KERN_INFO, regs);
        }
 
        info.si_signo = signal;
        info.si_errno = 0;
        info.si_code  = code;
-       info.si_addr  = pc;
+       info.si_addr  = (void __user *)address;
 
        arm64_notify_die(desc, regs, &info, 0);
 }
@@ -348,7 +349,7 @@ void force_signal_inject(int signal, int code, struct pt_regs *regs,
 /*
  * Set up process info to signal segmentation fault - called on access error.
  */
-void arm64_notify_segfault(struct pt_regs *regs, unsigned long addr)
+void arm64_notify_segfault(unsigned long addr)
 {
        int code;
 
@@ -359,7 +360,7 @@ void arm64_notify_segfault(struct pt_regs *regs, unsigned long addr)
                code = SEGV_ACCERR;
        up_read(&current->mm->mmap_sem);
 
-       force_signal_inject(SIGSEGV, code, regs, addr);
+       force_signal_inject(SIGSEGV, code, addr);
 }
 
 asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
@@ -371,7 +372,7 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
        if (call_undef_hook(regs) == 0)
                return;
 
-       force_signal_inject(SIGILL, ILL_ILLOPC, regs, 0);
+       force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
 }
 
 int cpu_enable_cache_maint_trap(void *__unused)
@@ -426,12 +427,12 @@ static void user_cache_maint_handler(unsigned int esr, struct pt_regs *regs)
                __user_cache_maint("ic ivau", address, ret);
                break;
        default:
-               force_signal_inject(SIGILL, ILL_ILLOPC, regs, 0);
+               force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
                return;
        }
 
        if (ret)
-               arm64_notify_segfault(regs, address);
+               arm64_notify_segfault(address);
        else
                arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
 }