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552b8aa4d1
This reverts commit 4217458daf.
Justin Madru bisected this commit, it was causing weird Firefox
crashes.
The reason is that GCC mis-optimizes (re-uses) the on-stack parameters of
the calling frame, which corrupts the syscall return pt_regs state and
thus corrupts user-space register state.
So we go back to the slightly less clean but more optimization-safe
method of getting to pt_regs. Also add a comment to explain this.
Resolves: http://bugzilla.kernel.org/show_bug.cgi?id=12505
Reported-and-bisected-by: Justin Madru <jdm64@gawab.com>
Tested-by: Justin Madru <jdm64@gawab.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
94 lines
2.9 KiB
C
94 lines
2.9 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
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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/types.h>
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#include <linux/signal.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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/* kernel/ldt.c */
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asmlinkage int sys_modify_ldt(int, void __user *, unsigned long);
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/* kernel/tls.c */
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asmlinkage int sys_set_thread_area(struct user_desc __user *);
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asmlinkage int 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/process_32.c */
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asmlinkage int sys_fork(struct pt_regs);
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asmlinkage int sys_clone(struct pt_regs);
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asmlinkage int sys_vfork(struct pt_regs);
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asmlinkage int sys_execve(struct pt_regs);
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/* kernel/signal_32.c */
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asmlinkage int sys_sigsuspend(int, int, old_sigset_t);
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asmlinkage int sys_sigaction(int, const struct old_sigaction __user *,
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struct old_sigaction __user *);
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asmlinkage int sys_sigaltstack(unsigned long);
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asmlinkage unsigned long sys_sigreturn(unsigned long);
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asmlinkage int sys_rt_sigreturn(unsigned long);
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/* kernel/ioport.c */
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asmlinkage long sys_iopl(unsigned long);
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/* kernel/sys_i386_32.c */
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asmlinkage long sys_mmap2(unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long, unsigned long);
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struct mmap_arg_struct;
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asmlinkage int old_mmap(struct mmap_arg_struct __user *);
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struct sel_arg_struct;
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asmlinkage int old_select(struct sel_arg_struct __user *);
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asmlinkage int sys_ipc(uint, int, int, int, void __user *, long);
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struct old_utsname;
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asmlinkage int sys_uname(struct old_utsname __user *);
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struct oldold_utsname;
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asmlinkage int sys_olduname(struct oldold_utsname __user *);
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/* kernel/vm86_32.c */
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asmlinkage int sys_vm86old(struct pt_regs);
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asmlinkage int sys_vm86(struct pt_regs);
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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_fork(struct pt_regs *);
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asmlinkage long sys_clone(unsigned long, unsigned long,
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void __user *, void __user *,
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struct pt_regs *);
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asmlinkage long sys_vfork(struct pt_regs *);
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asmlinkage long sys_execve(char __user *, char __user * __user *,
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char __user * __user *,
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struct pt_regs *);
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/* kernel/ioport.c */
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asmlinkage long sys_iopl(unsigned int, struct pt_regs *);
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/* kernel/signal_64.c */
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asmlinkage long sys_sigaltstack(const stack_t __user *, stack_t __user *,
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struct pt_regs *);
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asmlinkage long sys_rt_sigreturn(struct pt_regs *);
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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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struct new_utsname;
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asmlinkage long sys_uname(struct new_utsname __user *);
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#endif /* CONFIG_X86_32 */
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#endif /* _ASM_X86_SYSCALLS_H */
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