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05 April 2024, 19:05:47 UTC
Revision c05344947b37f7cda726e802457370bc6eac4d26 authored by Thomas Gleixner on 16 December 2017, 00:14:39 UTC, committed by Ingo Molnar on 22 December 2017, 19:13:00 UTC 
x86/mm/dump_pagetables: Check PAGE_PRESENT for real
 
The check for a present page in printk_prot():

       if (!pgprot_val(prot)) {
                /* Not present */

is bogus. If a PTE is set to PAGE_NONE then the pgprot_val is not zero and
the entry is decoded in bogus ways, e.g. as RX GLB. That is confusing when
analyzing mapping correctness. Check for the present bit to make an
informed decision.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 7bbcbd3
History
Tip revision: c05344947b37f7cda726e802457370bc6eac4d26 authored by Thomas Gleixner on 16 December 2017, 00:14:39 UTC
x86/mm/dump_pagetables: Check PAGE_PRESENT for real
Tip revision: c053449
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