linux-kernel - [RFC PATCH 3/7] mm: add pte_to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220825101037.96517-4-zhengqi.arch@bytedance.com>
Date:   Thu, 25 Aug 2022 18:10:33 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, david@...hat.com,
        kirill.shutemov@...ux.intel.com, mika.penttila@...tfour.com,
        jgg@...dia.com, tglx@...utronix.de, willy@...radead.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        muchun.song@...ux.dev, Qi Zheng <zhengqi.arch@...edance.com>
Subject: [RFC PATCH 3/7] mm: add pte_to_page() helper

Add pte_to_page() helper similar to pmd_to_page(), which
will be used to get the struct page of the PTE page table.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 include/linux/pgtable.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 9745684b0cdb..c4a6bda6e965 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -86,6 +86,14 @@ static inline unsigned long pud_index(unsigned long address)
 #define pgd_index(a)  (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 #endif
 
+#ifdef CONFIG_FREE_USER_PTE
+static inline struct page *pte_to_page(pte_t *pte)
+{
+	unsigned long mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
+	return virt_to_page((void *)((unsigned long) pte & mask));
+}
+#endif
+
 #ifndef pte_offset_kernel
 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
 {
-- 
2.20.1