linux-kernel - [PATCH] sys_poll: Fix negative timeout values for x86 userland on x86

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Date:	Sat, 17 Sep 2011 14:30:25 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH] sys_poll: Fix negative timeout values for x86 userland on
 x86_64 kernels

sizeof(int/long) differs on x86 and x86_64, so provide a compat_sys_poll().

Signed-off-by: Thomas Meyer <thomas@...3r.de>
---
 arch/x86/ia32/ia32entry.S |    2 +-
 fs/compat.c               |    6 ++++++
 include/linux/compat.h    |    2 ++
 3 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 54edb207..30f4116 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -671,7 +671,7 @@ ia32_sys_call_table:
 	.quad sys_getresuid16	/* 165 */
 	.quad sys32_vm86_warning	/* vm86 */ 
 	.quad quiet_ni_syscall	/* query_module */
-	.quad sys_poll
+	.quad compat_sys_poll
 	.quad quiet_ni_syscall /* old nfsservctl */
 	.quad sys_setresgid16	/* 170 */
 	.quad sys_getresgid16
diff --git a/fs/compat.c b/fs/compat.c
index 58b1da4..f176fda 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1621,6 +1621,12 @@ asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 				 sigsetsize);
 }
 
+asmlinkage long compat_sys_poll(struct pollfd __user *ufds, unsigned int nfds,
+				int timeout)
+{
+	return sys_poll(ufds, nfds, timeout);
+}
+
 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 	unsigned int nfds, struct compat_timespec __user *tsp,
 	const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
diff --git a/include/linux/compat.h b/include/linux/compat.h
index c6e7523..3bfb30a 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -433,6 +433,8 @@ asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 				    compat_ulong_t __user *exp,
 				    struct compat_timespec __user *tsp,
 				    void __user *sig);
+asmlinkage long compat_sys_poll(struct pollfd __user *ufds, unsigned int nfds,
+				int timeout);
 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
 				 unsigned int nfds,
 				 struct compat_timespec __user *tsp,
-- 
1.7.6


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