Commit dff54064 authored Aug 01, 2017 by Eric W. Biederman Committed by Greg Kroah-Hartman Feb 16, 2018

mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy

commit 6ac1dc736b323011a55ecd1fc5897c24c4f77cbd upstream.

Setting si_code to 0 is the same a setting si_code to SI_USER which is definitely
not correct. With si_code set to SI_USER si_pid and si_uid will be copied to
userspace instead of si_addr. Which is very wrong.

So fix this by using a sensible si_code (SEGV_MAPERR) for this failure.

Fixes: b920de1b ("mn10300: add the MN10300/AM33 architecture to the kernel")
Cc: David Howells <dhowells@redhat.com>
Cc: Masakazu Urade <urade.masakazu@jp.panasonic.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent c7aee394

arch/mn10300/mm/misalignment.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -437,7 +437,7 @@ asmlinkage void misalignment(struct pt_regs *regs, enum exception_code code)

		info.si_signo = SIGSEGV;
		info.si_errno = 0;
		info.si_code = 0;
		info.si_code = SEGV_MAPERR;
		info.si_addr = (void *) regs->pc;
		force_sig_info(SIGSEGV, &info, current);
		return;