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signal/arm64: Add and use arm64_force_sig_mceerr as appropriate

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Add arm64_force_sig_mceerr for consistency with arm64_force_sig_fault,
and use it in the one location that can take advantage of it.

This removes the fiddly filling out of siginfo before sending a signal
reporting an memory error to userspace.

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 10:37:15 +02:00
parent feca355b3d
commit b4d5557caa
3 changed files with 10 additions and 7 deletions
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1
arch/arm64/include/asm/traps.h
View File

@ -38,6 +38,7 @@ 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_mceerr(int code, void __user *addr, short lsb, const char *str);
void arm64_force_sig_info(struct siginfo *info, const char *str);
/*

7
arch/arm64/kernel/traps.c
View File

@ -255,6 +255,13 @@ void arm64_force_sig_fault(int signo, int code, void __user *addr,
force_sig_fault(signo, code, addr, current);
}
void arm64_force_sig_mceerr(int code, void __user *addr, short lsb,
const char *str)
{
arm64_show_signal(SIGBUS, str);
force_sig_mceerr(code, addr, lsb, current);
}
void arm64_force_sig_info(struct siginfo *info, const char *str)
{
arm64_show_signal(info->si_signo, str);

9
arch/arm64/mm/fault.c
View File

@ -422,7 +422,6 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
const struct fault_info *inf;
struct task_struct *tsk;
struct mm_struct *mm;
struct siginfo si;
vm_fault_t fault, major = 0;
unsigned long vm_flags = VM_READ | VM_WRITE;
unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
@ -574,12 +573,8 @@ retry:
if (fault & VM_FAULT_HWPOISON_LARGE)
lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
clear_siginfo(&si);
si.si_signo = SIGBUS;
si.si_code = BUS_MCEERR_AR;
si.si_addr = (void __user *)addr;
si.si_addr_lsb = lsb;
arm64_force_sig_info(&si, inf->name);
arm64_force_sig_mceerr(BUS_MCEERR_AR, (void __user *)addr, lsb,
inf->name);
} else {
/*
* Something tried to access memory that isn't in our memory