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signal/powerpc: Specialize _exception_pkey for handling pkey exceptions 

Now that _exception no longer calls _exception_pkey it is no longer
necessary to handle any signal with any si_code.  All pkey exceptions
are SIGSEGV with paired with SEGV_PKUERR.  So just handle
that case and remove the now unnecessary parameters from _exception_pkey.

Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-09-18 10:56:25 +02:00
parent c1c7c85cea
commit 5d8fb8a586
3 changed files with 7 additions and 7 deletions
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2
arch/powerpc/include/asm/bug.h
View File

@ -133,7 +133,7 @@ struct pt_regs;
extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
extern void bad_page_fault(struct pt_regs *, unsigned long, int);
extern void _exception(int, struct pt_regs *, int, unsigned long);
extern void _exception_pkey(int, struct pt_regs *, int, unsigned long, int);
extern void _exception_pkey(struct pt_regs *, unsigned long, int);
extern void die(const char *, struct pt_regs *, long);
extern bool die_will_crash(void);
extern void panic_flush_kmsg_start(void);

10
arch/powerpc/kernel/traps.c
View File

@ -362,20 +362,20 @@ static bool exception_common(int signr, struct pt_regs *regs, int code,
return true;
}
void _exception_pkey(int signr, struct pt_regs *regs, int code, unsigned long addr, int key)
void _exception_pkey(struct pt_regs *regs, unsigned long addr, int key)
{
siginfo_t info;
if (!exception_common(signr, regs, code, addr))
if (!exception_common(SIGSEGV, regs, SEGV_PKUERR, addr))
return;
clear_siginfo(&info);
info.si_signo = signr;
info.si_code = code;
info.si_signo = SIGSEGV;
info.si_code = SEGV_PKUERR;
info.si_addr = (void __user *) addr;
info.si_pkey = key;
force_sig_info(signr, &info, current);
force_sig_info(info.si_signo, &info, current);
}
void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)

2
arch/powerpc/mm/fault.c
View File

@ -152,7 +152,7 @@ static int bad_key_fault_exception(struct pt_regs *regs, unsigned long address,
if (!user_mode(regs))
return SIGSEGV;
_exception_pkey(SIGSEGV, regs, SEGV_PKUERR, address, pkey);
_exception_pkey(regs, address, pkey);
return 0;
}