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db695c0509
Mark Brand reports that a NEEDS_SYSCALL_FOR_CMPXCHG enabled kernel would open a security hole in the ghost syscall used to implement cmpxchg, as it fails to validate the user pointer. However, in order for this option to be enabled, you'd need to be building a pre-ARMv6 kernel with SMP support. There is only one system known which fits that, which is an early ARM SMP FPGA implementation based on the ARM926T. In any case, the Kconfig does not allow SMP to be enabled for pre-ARMv6 systems. Moreover, even if NEEDS_SYSCALL_FOR_CMPXCHG were to be enabled, the kernel would not build as __ARM_NR_cmpxchg64 is not defined. The simple answer is to remove the buggy code. Reported-by: Mark Brand <markbrand@google.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/*
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* arch/arm/include/asm/unistd.h
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*
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* Copyright (C) 2001-2005 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Please forward _all_ changes to this file to rmk@arm.linux.org.uk,
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* no matter what the change is. Thanks!
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*/
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#ifndef __ASM_ARM_UNISTD_H
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#define __ASM_ARM_UNISTD_H
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#include <uapi/asm/unistd.h>
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/*
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* This may need to be greater than __NR_last_syscall+1 in order to
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* account for the padding in the syscall table
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*/
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#define __NR_syscalls (388)
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#define __ARCH_WANT_STAT64
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#define __ARCH_WANT_SYS_GETHOSTNAME
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#define __ARCH_WANT_SYS_PAUSE
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#define __ARCH_WANT_SYS_GETPGRP
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#define __ARCH_WANT_SYS_LLSEEK
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#define __ARCH_WANT_SYS_NICE
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#define __ARCH_WANT_SYS_SIGPENDING
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#define __ARCH_WANT_SYS_SIGPROCMASK
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#define __ARCH_WANT_SYS_OLD_MMAP
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#define __ARCH_WANT_SYS_OLD_SELECT
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#if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
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#define __ARCH_WANT_SYS_TIME
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#define __ARCH_WANT_SYS_IPC
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#define __ARCH_WANT_SYS_OLDUMOUNT
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#define __ARCH_WANT_SYS_ALARM
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#define __ARCH_WANT_SYS_UTIME
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#define __ARCH_WANT_SYS_OLD_GETRLIMIT
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#define __ARCH_WANT_OLD_READDIR
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#define __ARCH_WANT_SYS_SOCKETCALL
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#endif
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#define __ARCH_WANT_SYS_FORK
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#define __ARCH_WANT_SYS_VFORK
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#define __ARCH_WANT_SYS_CLONE
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/*
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* Unimplemented (or alternatively implemented) syscalls
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*/
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#define __IGNORE_fadvise64_64
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#define __IGNORE_migrate_pages
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#endif /* __ASM_ARM_UNISTD_H */
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