https://github.com/torvalds/linux
Revision 49275fef986abfb8b476e4708aaecc07e7d3e087 authored by Andy Lutomirski on 11 December 2017, 06:47:19 UTC, committed by Ingo Molnar on 22 December 2017, 19:13:01 UTC
The kernel is very erratic as to which pagetables have _PAGE_USER set. The vsyscall page gets lucky: it seems that all of the relevant pagetables are among the apparently arbitrary ones that set _PAGE_USER. Rather than relying on chance, just explicitly set _PAGE_USER. This will let us clean up pagetable setup to stop setting _PAGE_USER. The added code can also be reused by pagetable isolation to manage the _PAGE_USER bit in the usermode tables. [ tglx: Folded paravirt fix from Juergen Gross ] 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>
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Tip revision: 49275fef986abfb8b476e4708aaecc07e7d3e087 authored by Andy Lutomirski on 11 December 2017, 06:47:19 UTC
x86/vsyscall/64: Explicitly set _PAGE_USER in the pagetable hierarchy
x86/vsyscall/64: Explicitly set _PAGE_USER in the pagetable hierarchy
Tip revision: 49275fe
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