x86: syscall_get_nr returns int
Make syscall_get_nr() return int, so we always sign-extend the low 32 bits of orig_ax in checks. Signed-off-by: Roland McGrath <roland@redhat.com>
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@ -1,7 +1,7 @@
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/*
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/*
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* Access to user system call parameters and results
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* Access to user system call parameters and results
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*
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*
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* Copyright (C) 2008 Red Hat, Inc. All rights reserved.
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* Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
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*
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*
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* This copyrighted material is made available to anyone wishing to use,
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* modify, copy, or redistribute it subject to the terms and conditions
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@ -16,13 +16,13 @@
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/err.h>
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static inline long syscall_get_nr(struct task_struct *task,
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/*
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struct pt_regs *regs)
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* Only the low 32 bits of orig_ax are meaningful, so we return int.
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* This importantly ignores the high bits on 64-bit, so comparisons
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* sign-extend the low 32 bits.
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*/
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static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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{
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{
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/*
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* We always sign-extend a -1 value being set here,
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* so this is always either -1L or a syscall number.
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*/
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return regs->orig_ax;
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return regs->orig_ax;
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}
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}
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