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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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da20ab3518
We do not have tracepoints for sys_modify_ldt() because we define it directly instead of using the normal SYSCALL_DEFINEx() macros. However, there is a reason sys_modify_ldt() does not use the macros: it has an 'int' return type instead of 'unsigned long'. This is a bug, but it's a bug cemented in the ABI. What does this mean? If we return -EINVAL from a function that returns 'int', we have 0x00000000ffffffea in %rax. But, if we return -EINVAL from a function returning 'unsigned long', we end up with 0xffffffffffffffea in %rax, which is wrong. To work around this and maintain the 'int' behavior while using the SYSCALL_DEFINEx() macros, so we add a cast to 'unsigned int' in both implementations of sys_modify_ldt(). Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Brian Gerst <brgerst@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20171018172107.1A79C532@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* syscalls.h - Linux syscall interfaces (arch-specific)
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*
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* Copyright (c) 2008 Jaswinder Singh Rajput
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*
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* This file is released under the GPLv2.
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* See the file COPYING for more details.
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*/
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#ifndef _ASM_X86_SYSCALLS_H
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#define _ASM_X86_SYSCALLS_H
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <linux/signal.h>
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#include <linux/types.h>
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/* Common in X86_32 and X86_64 */
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/* kernel/ioport.c */
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asmlinkage long sys_ioperm(unsigned long, unsigned long, int);
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asmlinkage long sys_iopl(unsigned int);
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/* kernel/ldt.c */
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asmlinkage long sys_modify_ldt(int, void __user *, unsigned long);
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/* kernel/signal.c */
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asmlinkage long sys_rt_sigreturn(void);
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/* kernel/tls.c */
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asmlinkage long sys_set_thread_area(struct user_desc __user *);
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asmlinkage long sys_get_thread_area(struct user_desc __user *);
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/* X86_32 only */
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#ifdef CONFIG_X86_32
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/* kernel/signal.c */
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asmlinkage unsigned long sys_sigreturn(void);
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/* kernel/vm86_32.c */
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struct vm86_struct;
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asmlinkage long sys_vm86old(struct vm86_struct __user *);
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asmlinkage long sys_vm86(unsigned long, unsigned long);
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#else /* CONFIG_X86_32 */
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/* X86_64 only */
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/* kernel/process_64.c */
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asmlinkage long sys_arch_prctl(int, unsigned long);
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/* kernel/sys_x86_64.c */
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asmlinkage long sys_mmap(unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long, unsigned long);
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#endif /* CONFIG_X86_32 */
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#endif /* _ASM_X86_SYSCALLS_H */
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