Commit 05e792e3 authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

signal/arm: Push siginfo generation into arm_notify_die 



In arm_notify_die call force_sig_fault to let the generic
code handle siginfo generation.

This removes some boiler plate making the code easier to
maintain in the long run.

Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
parent c8526809

arch/arm/include/asm/bug.h

+2 −2
Original line number Diff line number Diff line
@@ -62,8 +62,8 @@ do { \ 
struct pt_regs;

void die(const char *msg, struct pt_regs *regs, int err);



struct siginfo;

void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,

void arm_notify_die(const char *str, struct pt_regs *regs,

		int signo, int si_code, void __user *addr,

		unsigned long err, unsigned long trap);



#ifdef CONFIG_ARM_LPAE

arch/arm/kernel/swp_emulate.c

+7 −9
Original line number Diff line number Diff line
@@ -98,22 +98,20 @@ static int proc_status_show(struct seq_file *m, void *v) 
 */

static void set_segfault(struct pt_regs *regs, unsigned long addr)

{

	siginfo_t info;

	int si_code;



	clear_siginfo(&info);

	down_read(&current->mm->mmap_sem);

	if (find_vma(current->mm, addr) == NULL)

		info.si_code = SEGV_MAPERR;

		si_code = SEGV_MAPERR;

	else

		info.si_code = SEGV_ACCERR;

		si_code = SEGV_ACCERR;

	up_read(&current->mm->mmap_sem);



	info.si_signo = SIGSEGV;

	info.si_errno = 0;

	info.si_addr  = (void *) instruction_pointer(regs);



	pr_debug("SWP{B} emulation: access caused memory abort!\n");

	arm_notify_die("Illegal memory access", regs, &info, 0, 0);

	arm_notify_die("Illegal memory access", regs,

		       SIGSEGV, si_code,

		       (void __user *)instruction_pointer(regs),

		       0, 0);



	abtcounter++;

}

arch/arm/kernel/traps.c

+17 −46
Original line number Diff line number Diff line
@@ -365,13 +365,14 @@ void die(const char *str, struct pt_regs *regs, int err) 
}



void arm_notify_die(const char *str, struct pt_regs *regs,

		struct siginfo *info, unsigned long err, unsigned long trap)

		int signo, int si_code, void __user *addr,

		unsigned long err, unsigned long trap)

{

	if (user_mode(regs)) {

		current->thread.error_code = err;

		current->thread.trap_no = trap;



		force_sig_info(info->si_signo, info, current);

		force_sig_fault(signo, si_code, addr, current);

	} else {

		die(str, regs, err);

	}
@@ -438,10 +439,8 @@ int call_undef_hook(struct pt_regs *regs, unsigned int instr) 
asmlinkage void do_undefinstr(struct pt_regs *regs)

{

	unsigned int instr;

	siginfo_t info;

	void __user *pc;



	clear_siginfo(&info);

	pc = (void __user *)instruction_pointer(regs);



	if (processor_mode(regs) == SVC_MODE) {
@@ -485,13 +484,8 @@ die_sig: 
		dump_instr(KERN_INFO, regs);

	}

#endif



	info.si_signo = SIGILL;

	info.si_errno = 0;

	info.si_code  = ILL_ILLOPC;

	info.si_addr  = pc;



	arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6);

	arm_notify_die("Oops - undefined instruction", regs,

		       SIGILL, ILL_ILLOPC, pc, 0, 6);

}

NOKPROBE_SYMBOL(do_undefinstr)
@@ -539,9 +533,6 @@ asmlinkage void bad_mode(struct pt_regs *regs, int reason) 


static int bad_syscall(int n, struct pt_regs *regs)

{

	siginfo_t info;



	clear_siginfo(&info);

	if ((current->personality & PER_MASK) != PER_LINUX) {

		send_sig(SIGSEGV, current, 1);

		return regs->ARM_r0;
@@ -555,13 +546,10 @@ static int bad_syscall(int n, struct pt_regs *regs) 
	}

#endif



	info.si_signo = SIGILL;

	info.si_errno = 0;

	info.si_code  = ILL_ILLTRP;

	info.si_addr  = (void __user *)instruction_pointer(regs) -

			 (thumb_mode(regs) ? 2 : 4);



	arm_notify_die("Oops - bad syscall", regs, &info, n, 0);

	arm_notify_die("Oops - bad syscall", regs, SIGILL, ILL_ILLTRP,

		       (void __user *)instruction_pointer(regs) -

			 (thumb_mode(regs) ? 2 : 4),

		       n, 0);



	return regs->ARM_r0;

}
@@ -607,20 +595,13 @@ do_cache_op(unsigned long start, unsigned long end, int flags) 
#define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)

asmlinkage int arm_syscall(int no, struct pt_regs *regs)

{

	siginfo_t info;



	clear_siginfo(&info);

	if ((no >> 16) != (__ARM_NR_BASE>> 16))

		return bad_syscall(no, regs);



	switch (no & 0xffff) {

	case 0: /* branch through 0 */

		info.si_signo = SIGSEGV;

		info.si_errno = 0;

		info.si_code  = SEGV_MAPERR;

		info.si_addr  = NULL;



		arm_notify_die("branch through zero", regs, &info, 0, 0);

		arm_notify_die("branch through zero", regs,

			       SIGSEGV, SEGV_MAPERR, NULL, 0, 0);

		return 0;



	case NR(breakpoint): /* SWI BREAK_POINT */
@@ -688,13 +669,10 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs) 
		}

	}

#endif

	info.si_signo = SIGILL;

	info.si_errno = 0;

	info.si_code  = ILL_ILLTRP;

	info.si_addr  = (void __user *)instruction_pointer(regs) -

			 (thumb_mode(regs) ? 2 : 4);



	arm_notify_die("Oops - bad syscall(2)", regs, &info, no, 0);

	arm_notify_die("Oops - bad syscall(2)", regs, SIGILL, ILL_ILLTRP,

		       (void __user *)instruction_pointer(regs) -

			 (thumb_mode(regs) ? 2 : 4),

		       no, 0);

	return 0;

}
@@ -744,9 +722,6 @@ asmlinkage void 
baddataabort(int code, unsigned long instr, struct pt_regs *regs)

{

	unsigned long addr = instruction_pointer(regs);

	siginfo_t info;



	clear_siginfo(&info);



#ifdef CONFIG_DEBUG_USER

	if (user_debug & UDBG_BADABORT) {
@@ -757,12 +732,8 @@ baddataabort(int code, unsigned long instr, struct pt_regs *regs) 
	}

#endif



	info.si_signo = SIGILL;

	info.si_errno = 0;

	info.si_code  = ILL_ILLOPC;

	info.si_addr  = (void __user *)addr;



	arm_notify_die("unknown data abort code", regs, &info, instr, 0);

	arm_notify_die("unknown data abort code", regs,

		       SIGILL, ILL_ILLOPC, (void __user *)addr, instr, 0);

}



void __readwrite_bug(const char *fn)

arch/arm/mm/fault.c

+4 −14
Original line number Diff line number Diff line
@@ -554,7 +554,6 @@ asmlinkage void 
do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)

{

	const struct fsr_info *inf = fsr_info + fsr_fs(fsr);

	struct siginfo info;



	if (!inf->fn(addr, fsr & ~FSR_LNX_PF, regs))

		return;
@@ -563,12 +562,8 @@ do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs) 
		inf->name, fsr, addr);

	show_pte(current->mm, addr);



	clear_siginfo(&info);

	info.si_signo = inf->sig;

	info.si_errno = 0;

	info.si_code  = inf->code;

	info.si_addr  = (void __user *)addr;

	arm_notify_die("", regs, &info, fsr, 0);

	arm_notify_die("", regs, inf->sig, inf->code, (void __user *)addr,

		       fsr, 0);

}



void __init
@@ -588,7 +583,6 @@ asmlinkage void 
do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)

{

	const struct fsr_info *inf = ifsr_info + fsr_fs(ifsr);

	struct siginfo info;



	if (!inf->fn(addr, ifsr | FSR_LNX_PF, regs))

		return;
@@ -596,12 +590,8 @@ do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs) 
	pr_alert("Unhandled prefetch abort: %s (0x%03x) at 0x%08lx\n",

		inf->name, ifsr, addr);



	clear_siginfo(&info);

	info.si_signo = inf->sig;

	info.si_errno = 0;

	info.si_code  = inf->code;

	info.si_addr  = (void __user *)addr;

	arm_notify_die("", regs, &info, ifsr, 0);

	arm_notify_die("", regs, inf->sig, inf->code, (void __user *)addr,

		       ifsr, 0);

}



/*

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