linux-kernel - [PATCH v5 15/17] events/uprobes: Break COW PTE before replacing page

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Message-Id: <20230414142341.354556-16-shiyn.lin@gmail.com>
Date:   Fri, 14 Apr 2023 22:23:39 +0800
From:   Chih-En Lin <shiyn.lin@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        David Hildenbrand <david@...hat.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        John Hubbard <jhubbard@...dia.com>,
        Nadav Amit <namit@...are.com>, Barry Song <baohua@...nel.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
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        Minchan Kim <minchan@...nel.org>,
        Joey Gouly <joey.gouly@....com>,
        Chih-En Lin <shiyn.lin@...il.com>,
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        Suren Baghdasaryan <surenb@...gle.com>,
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        Shakeel Butt <shakeelb@...gle.com>,
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        "Jason A. Donenfeld" <Jason@...c4.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexey Gladkov <legion@...nel.org>, x86@...nel.org,
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        Dinglan Peng <peng301@...due.edu>,
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        Jim Huang <jserv@...s.ncku.edu.tw>,
        Huichun Feng <foxhoundsk.tw@...il.com>
Subject: [PATCH v5 15/17] events/uprobes: Break COW PTE before replacing page

Break COW PTE if we want to replace the page which
resides in COW-ed PTE.

Signed-off-by: Chih-En Lin <shiyn.lin@...il.com>
---
 kernel/events/uprobes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 59887c69d54c..db6bfaab928d 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -156,7 +156,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
 	struct folio *old_folio = page_folio(old_page);
 	struct folio *new_folio;
 	struct mm_struct *mm = vma->vm_mm;
-	DEFINE_FOLIO_VMA_WALK(pvmw, old_folio, vma, addr, 0);
+	DEFINE_FOLIO_VMA_WALK(pvmw, old_folio, vma, addr, PVMW_BREAK_COW_PTE);
 	int err;
 	struct mmu_notifier_range range;
 
-- 
2.34.1