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x86/vsyscall/64: Warn and fail vsyscall emulation in NATIVE mode
commit 4831b77940
upstream.
If something goes wrong with pagetable setup, vsyscall=native will
accidentally fall back to emulation. Make it warn and fail so that we
notice.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 4 additions and 0 deletions
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@ -139,6 +139,10 @@ bool emulate_vsyscall(struct pt_regs *regs, unsigned long address)
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WARN_ON_ONCE(address != regs->ip);
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/* This should be unreachable in NATIVE mode. */
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if (WARN_ON(vsyscall_mode == NATIVE))
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return false;
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if (vsyscall_mode == NONE) {
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warn_bad_vsyscall(KERN_INFO, regs,
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"vsyscall attempted with vsyscall=none");
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