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signal/arm64: Add and use arm64_force_sig_fault where appropriate 

Wrap force_sig_fault with a helper that calls arm64_show_signal
and call arm64_force_sig_fault where appropraite.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-09-22 10:26:57 +02:00
parent 559d8d91a8
commit feca355b3d
5 changed files with 25 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/include/asm/traps.h
View File

@ -37,6 +37,7 @@ void register_undef_hook(struct undef_hook *hook);
void unregister_undef_hook(struct undef_hook *hook);
void force_signal_inject(int signal, int code, unsigned long address);
void arm64_notify_segfault(unsigned long addr);
void arm64_force_sig_fault(int signo, int code, void __user *addr, const char *str);
void arm64_force_sig_info(struct siginfo *info, const char *str);
/*

11
arch/arm64/kernel/debug-monitors.c
View File

@ -210,13 +210,6 @@ NOKPROBE_SYMBOL(call_step_hook);
static void send_user_sigtrap(int si_code)
{
struct pt_regs *regs = current_pt_regs();
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = si_code;
info.si_addr = (void __user *)instruction_pointer(regs);
if (WARN_ON(!user_mode(regs)))
return;
@ -224,7 +217,9 @@ static void send_user_sigtrap(int si_code)
if (interrupts_enabled(regs))
local_irq_enable();
arm64_force_sig_info(&info, "User debug trap");
arm64_force_sig_fault(SIGTRAP, si_code,
(void __user *)instruction_pointer(regs),
"User debug trap");
}
static int single_step_handler(unsigned long addr, unsigned int esr,

11
arch/arm64/kernel/ptrace.c
View File

@ -182,13 +182,6 @@ static void ptrace_hbptriggered(struct perf_event *bp,
struct pt_regs *regs)
{
struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_HWBKPT;
info.si_addr = (void __user *)(bkpt->trigger);
#ifdef CONFIG_COMPAT
if (is_compat_task()) {
@ -211,7 +204,9 @@ static void ptrace_hbptriggered(struct perf_event *bp,
force_sig_ptrace_errno_trap(si_errno, (void __user *)bkpt->trigger);
}
#endif
arm64_force_sig_info(&info, "Hardware breakpoint trap (ptrace)");
arm64_force_sig_fault(SIGTRAP, TRAP_HWBKPT,
(void __user *)(bkpt->trigger),
"Hardware breakpoint trap (ptrace)");
}
/*

27
arch/arm64/kernel/traps.c
View File

@ -248,6 +248,13 @@ static void arm64_show_signal(int signo, const char *str)
__show_regs(regs);
}
void arm64_force_sig_fault(int signo, int code, void __user *addr,
const char *str)
{
arm64_show_signal(signo, str);
force_sig_fault(signo, code, addr, current);
}
void arm64_force_sig_info(struct siginfo *info, const char *str)
{
arm64_show_signal(info->si_signo, str);
@ -259,19 +266,11 @@ void arm64_notify_die(const char *str, struct pt_regs *regs,
int err)
{
if (user_mode(regs)) {
struct siginfo info;
WARN_ON(regs != current_pt_regs());
current->thread.fault_address = 0;
current->thread.fault_code = err;
clear_siginfo(&info);
info.si_signo = signo;
info.si_errno = 0;
info.si_code = sicode;
info.si_addr = addr;
arm64_force_sig_info(&info, str);
arm64_force_sig_fault(signo, sicode, addr, str);
} else {
die(str, regs, err);
}
@ -616,19 +615,13 @@ asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
*/
asmlinkage void bad_el0_sync(struct pt_regs *regs, int reason, unsigned int esr)
{
siginfo_t info;
void __user *pc = (void __user *)instruction_pointer(regs);
clear_siginfo(&info);
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = pc;
current->thread.fault_address = 0;
current->thread.fault_code = esr;
arm64_force_sig_info(&info, "Bad EL0 synchronous exception");
arm64_force_sig_fault(SIGILL, ILL_ILLOPC, pc,
"Bad EL0 synchronous exception");
}
#ifdef CONFIG_VMAP_STACK

26
arch/arm64/mm/fault.c
View File

@ -362,15 +362,10 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re
*/
if (user_mode(regs)) {
const struct fault_info *inf = esr_to_fault_info(esr);
struct siginfo si;
clear_siginfo(&si);
si.si_signo = inf->sig;
si.si_code = inf->code;
si.si_addr = (void __user *)addr;
set_thread_esr(addr, esr);
arm64_force_sig_info(&si, inf->name);
arm64_force_sig_fault(inf->sig, inf->code, (void __user *)addr,
inf->name);
} else {
__do_kernel_fault(addr, esr, regs);
}
@ -570,11 +565,8 @@ retry:
* We had some memory, but were unable to successfully fix up
* this page fault.
*/
clear_siginfo(&si);
si.si_signo = SIGBUS;
si.si_code = BUS_ADRERR;
si.si_addr = (void __user *)addr;
arm64_force_sig_info(&si, inf->name);
arm64_force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)addr,
inf->name);
} else if (fault & (VM_FAULT_HWPOISON_LARGE | VM_FAULT_HWPOISON)) {
unsigned int lsb;
@ -593,12 +585,10 @@ retry:
* Something tried to access memory that isn't in our memory
* map.
*/
clear_siginfo(&si);
si.si_signo = SIGSEGV;
si.si_code = fault == VM_FAULT_BADACCESS ?
SEGV_ACCERR : SEGV_MAPERR;
si.si_addr = (void __user *)addr;
arm64_force_sig_info(&si, inf->name);
arm64_force_sig_fault(SIGSEGV,
fault == VM_FAULT_BADACCESS ? SEGV_ACCERR : SEGV_MAPERR,
(void __user *)addr,
inf->name);
}
return 0;