linux-kernel - Re: strace-4.18 test suite oopses sparc64 4.12 and 4.13-rc kernels

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:   Thu, 03 Aug 2017 14:57:48 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     mikpelinux@...il.com
Cc:     sam@...nborg.org, matorola@...il.com, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: strace-4.18 test suite oopses sparc64 4.12 and 4.13-rc kernels

From: Mikael Pettersson <mikpelinux@...il.com>
Date: Thu, 3 Aug 2017 22:02:57 +0200

> With that in place the kernel booted fine.
> When I then ran the `poll' strace test binary, the OOPS was replaced by:
> 
> [  140.589913] _copy_from_user(fff000123c8dfa7c,           (null), 240) res 240
> [  140.753162] _copy_from_user(fff000123c8dfa7c, 00000000f7e4a000, 8) res 8
> [  140.824155] _copy_from_user(fff000123c8dfa7c, 00000000f7e49ff8, 16) res 18442240552407530112
> 
> That last `res' doesn't look good.

Please test this patch:

diff --git a/arch/sparc/lib/U3memcpy.S b/arch/sparc/lib/U3memcpy.S
index 54f9870..5a8cb37 100644
--- a/arch/sparc/lib/U3memcpy.S
+++ b/arch/sparc/lib/U3memcpy.S
@@ -145,13 +145,13 @@ ENDPROC(U3_retl_o2_plus_GS_plus_0x08)
 ENTRY(U3_retl_o2_and_7_plus_GS)
 	and	%o2, 7, %o2
 	retl
-	 add	%o2, GLOBAL_SPARE, %o2
+	 add	%o2, GLOBAL_SPARE, %o0
 ENDPROC(U3_retl_o2_and_7_plus_GS)
 ENTRY(U3_retl_o2_and_7_plus_GS_plus_8)
 	add	GLOBAL_SPARE, 8, GLOBAL_SPARE
 	and	%o2, 7, %o2
 	retl
-	 add	%o2, GLOBAL_SPARE, %o2
+	 add	%o2, GLOBAL_SPARE, %o0
 ENDPROC(U3_retl_o2_and_7_plus_GS_plus_8)
 #endif