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918ce32509
Just segfaulting the application when it tries to read the vsyscall page in xonly mode is not helpful for those who need to debug it. Emit a hint. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Florian Weimer <fweimer@redhat.com> Cc: Jann Horn <jannh@google.com> Link: https://lkml.kernel.org/r/8016afffe0eab497be32017ad7f6f7030dc3ba66.1561610354.git.luto@kernel.org
27 lines
703 B
C
27 lines
703 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_VSYSCALL_H
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#define _ASM_X86_VSYSCALL_H
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#include <linux/seqlock.h>
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#include <uapi/asm/vsyscall.h>
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#ifdef CONFIG_X86_VSYSCALL_EMULATION
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extern void map_vsyscall(void);
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extern void set_vsyscall_pgtable_user_bits(pgd_t *root);
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/*
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* Called on instruction fetch fault in vsyscall page.
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* Returns true if handled.
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*/
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extern bool emulate_vsyscall(unsigned long error_code,
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struct pt_regs *regs, unsigned long address);
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#else
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static inline void map_vsyscall(void) {}
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static inline bool emulate_vsyscall(unsigned long error_code,
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struct pt_regs *regs, unsigned long address)
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{
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return false;
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}
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#endif
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#endif /* _ASM_X86_VSYSCALL_H */
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