linux-kernel - [PATCH 1/4] MIPS: Fix ISA I FP sigcontext access violation handling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 31 Oct 2016 16:25:44 +0000
From:   "Maciej W. Rozycki" <macro@...tec.com>
To:     Ralf Baechle <ralf@...ux-mips.org>
CC:     <linux-mips@...ux-mips.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/4] MIPS: Fix ISA I FP sigcontext access violation
 handling

Complement commit 0ae8dceaebe3 ("Merge with 2.3.10.") and use the local 
`fault' handler to recover from FP sigcontext access violation faults, 
like corresponding code does in r4k_fpu.S.  The `bad_stack' handler is 
in syscall.c and is not suitable here as we want to propagate the error 
condition up through the caller rather than killing the thread outright.

Signed-off-by: Maciej W. Rozycki <macro@...tec.com>
---
 I guess it hardly ever triggers and code still builds, so it has aged so
well...

  Maciej

linux-mips-isa1-sig-fp-context-fault.patch
Index: linux-sfr-test/arch/mips/kernel/r2300_fpu.S
===================================================================
--- linux-sfr-test.orig/arch/mips/kernel/r2300_fpu.S	2016-10-22 02:36:46.000000000 +0100
+++ linux-sfr-test/arch/mips/kernel/r2300_fpu.S	2016-10-22 02:37:20.891186000 +0100
@@ -21,7 +21,7 @@
 #define EX(a,b)							\
 9:	a,##b;							\
 	.section __ex_table,"a";				\
-	PTR	9b,bad_stack;					\
+	PTR	9b,fault;					\
 	.previous

 	.set	noreorder