linux-kernel - [PATCH v5 18/23] ptrace: Allow compat to use the native siginfo

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]

Message-ID: <1443564860-31208-19-git-send-email-ynorov@caviumnetworks.com>
Date:	Wed, 30 Sep 2015 01:14:15 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <catalin.marinas@....com>,
	<arnd@...db.de>, <agraf@...e.de>, <bamvor.zhangjian@...wei.com>
CC:	<yury.norov@...il.com>, <philipp.tomsich@...obroma-systems.com>,
	<apinski@...ium.com>, <christoph.muellner@...obroma-systems.com>,
	<klimov.linux@...il.com>, Yury Norov <ynorov@...iumnetworks.com>
Subject: [PATCH v5 18/23] ptrace: Allow compat to use the native siginfo

From: Andrew Pinski <apinski@...ium.com>

Set COMPAT_USE_NATIVE_SIGINFO to be true for non AARCH32 tasks.

With ARM64 ILP32 ABI, we want to use the non-compat
siginfo as we want to simplify signal handling for this new ABI.
This patch just adds a new define COMPAT_USE_NATIVE_SIGINFO and
if it is true then read/write in the compat case as it was the
non-compat case.

Signed-off-by: Christoph Muellner <christoph.muellner@...obroma-systems.com>
Signed-off-by: Philipp Tomsich <philipp.tomsich@...obroma-systems.com>
Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>

diff --git a/include/linux/compat.h b/include/linux/compat.h
index a76c917..0a25d90 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -24,6 +24,10 @@
 #define COMPAT_USE_64BIT_TIME 0
 #endif
 
+#ifndef COMPAT_USE_NATIVE_SIGINFO
+#define COMPAT_USE_NATIVE_SIGINFO 0
+#endif
+
 #ifndef __SC_DELOUSE
 #define __SC_DELOUSE(t,v) ((t)(unsigned long)(v))
 #endif
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 787320d..04799aa 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -652,7 +652,7 @@ static int ptrace_peek_siginfo(struct task_struct *child,
 			break;
 
 #ifdef CONFIG_COMPAT
-		if (unlikely(is_compat_task())) {
+		if (unlikely(is_compat_task() && !COMPAT_USE_NATIVE_SIGINFO)) {
 			compat_siginfo_t __user *uinfo = compat_ptr(data);
 
 			if (copy_siginfo_to_user32(uinfo, &info) ||
@@ -1140,16 +1140,26 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
 
 	case PTRACE_GETSIGINFO:
 		ret = ptrace_getsiginfo(child, &siginfo);
-		if (!ret)
-			ret = copy_siginfo_to_user32(
-				(struct compat_siginfo __user *) datap,
-				&siginfo);
+		if (!ret) {
+			if (COMPAT_USE_NATIVE_SIGINFO)
+				ret = copy_siginfo_to_user(
+					(struct siginfo __user *) datap,
+					&siginfo);
+			else
+				ret = copy_siginfo_to_user32(
+					(struct compat_siginfo __user *) datap,
+					&siginfo);
+		}
 		break;
 
 	case PTRACE_SETSIGINFO:
 		memset(&siginfo, 0, sizeof siginfo);
-		if (copy_siginfo_from_user32(
-			    &siginfo, (struct compat_siginfo __user *) datap))
+		if (COMPAT_USE_NATIVE_SIGINFO)
+			ret = copy_from_user(&siginfo, datap, sizeof(siginfo));
+		else
+			ret = copy_siginfo_from_user32(
+				 &siginfo, (struct compat_siginfo __user *) datap);
+		if (ret)
 			ret = -EFAULT;
 		else
 			ret = ptrace_setsiginfo(child, &siginfo);
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/