linux-kernel - [PATCH 3/4] x86/mm: Inhibit _PAGE_NX changes from cpa_process

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Date:   Thu, 10 Nov 2022 13:52:56 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, dave.hansen@...el.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        torvalds@...ux-foundation.org, oliver.sang@...el.com
Subject: [PATCH 3/4] x86/mm: Inhibit _PAGE_NX changes from cpa_process_alias()

There is a cludge in change_page_attr_set_clr() that inhibits
propagating NX changes to the aliases (directmap and highmap) -- this
is a cludge twofold:

 - it also inhibits the primary checks in __change_page_attr();
 - it hard depends on single bit changes.

The introduction of set_memory_rox() triggered this last issue for
clearing both _PAGE_RW and _PAGE_NX.

Explicitly ignore _PAGE_NX in cpa_process_alias() instead.

Fixes: b38994948567 ("x86/mm: Implement native set_memory_rox()")
Reported-by: kernel test robot <oliver.sang@...el.com>
Debugged-by: Dave Hansen <dave.hansen@...el.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/mm/pat/set_memory.c |   28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -1663,6 +1663,12 @@ static int cpa_process_alias(struct cpa_
 		alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY);
 		alias_cpa.curpage = 0;
 
+		/* Directmap always has NX set, do not modify. */
+		if (__supported_pte_mask & _PAGE_NX) {
+			alias_cpa.mask_clr.pgprot &= ~_PAGE_NX;
+			alias_cpa.mask_set.pgprot &= ~_PAGE_NX;
+		}
+
 		cpa->force_flush_all = 1;
 
 		ret = __change_page_attr_set_clr(&alias_cpa, 0);
@@ -1685,6 +1691,15 @@ static int cpa_process_alias(struct cpa_
 		alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY);
 		alias_cpa.curpage = 0;
 
+		/*
+		 * [_text, _brk_end) also covers data, do not modify NX except
+		 * in cases where the highmap is the primary target.
+		 */
+		if (__supported_pte_mask & _PAGE_NX) {
+			alias_cpa.mask_clr.pgprot &= ~_PAGE_NX;
+			alias_cpa.mask_set.pgprot &= ~_PAGE_NX;
+		}
+
 		cpa->force_flush_all = 1;
 		/*
 		 * The high mapping range is imprecise, so ignore the
@@ -1703,6 +1718,12 @@ static int __change_page_attr_set_clr(st
 	unsigned long rempages = numpages;
 	int ret = 0;
 
+	/*
+	 * No changes, easy!
+	 */
+	if (!(pgprot_val(cpa->mask_set) | pgprot_val(cpa->mask_clr)))
+		return ret;
+
 	while (rempages) {
 		/*
 		 * Store the remaining nr of pages for the large page
@@ -1749,7 +1770,7 @@ static int change_page_attr_set_clr(unsi
 				    struct page **pages)
 {
 	struct cpa_data cpa;
-	int ret, cache, checkalias;
+	int ret, cache;
 
 	memset(&cpa, 0, sizeof(cpa));
 
@@ -1799,10 +1820,7 @@ static int change_page_attr_set_clr(unsi
 	cpa.curpage = 0;
 	cpa.force_split = force_split;
 
-	/* No alias checking for _NX bit modifications */
-	checkalias = (pgprot_val(mask_set) | pgprot_val(mask_clr)) != _PAGE_NX;
-
-	ret = __change_page_attr_set_clr(&cpa, checkalias);
+	ret = __change_page_attr_set_clr(&cpa, 1);
 
 	/*
 	 * Check whether we really changed something: