From: Nicholas Piggin <npiggin@gmail.com>
To: linux-mm@kvack.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Zefan Li <lizefan@huawei.com>
Subject: [PATCH v3 2/8] mm: apply_to_pte_range warn and fail if a large pte is encountered
Date: Mon, 10 Aug 2020 12:27:26 +1000 [thread overview]
Message-ID: <20200810022732.1150009-3-npiggin@gmail.com> (raw)
In-Reply-To: <20200810022732.1150009-1-npiggin@gmail.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
mm/memory.c | 60 +++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 44 insertions(+), 16 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index c39a13b09602..1d5f3093c249 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2260,13 +2260,20 @@ static int apply_to_pmd_range(struct mm_struct *mm, pud_t *pud,
}
do {
next = pmd_addr_end(addr, end);
- if (create || !pmd_none_or_clear_bad(pmd)) {
- err = apply_to_pte_range(mm, pmd, addr, next, fn, data,
- create);
- if (err)
- break;
+ if (pmd_none(*pmd) && !create)
+ continue;
+ if (WARN_ON_ONCE(pmd_leaf(*pmd)))
+ return -EINVAL;
+ if (WARN_ON_ONCE(pmd_bad(*pmd))) {
+ if (!create)
+ continue;
+ pmd_clear_bad(pmd);
}
+ err = apply_to_pte_range(mm, pmd, addr, next, fn, data, create);
+ if (err)
+ break;
} while (pmd++, addr = next, addr != end);
+
return err;
}
@@ -2287,13 +2294,20 @@ static int apply_to_pud_range(struct mm_struct *mm, p4d_t *p4d,
}
do {
next = pud_addr_end(addr, end);
- if (create || !pud_none_or_clear_bad(pud)) {
- err = apply_to_pmd_range(mm, pud, addr, next, fn, data,
- create);
- if (err)
- break;
+ if (pud_none(*pud) && !create)
+ continue;
+ if (WARN_ON_ONCE(pud_leaf(*pud)))
+ return -EINVAL;
+ if (WARN_ON_ONCE(pud_bad(*pud))) {
+ if (!create)
+ continue;
+ pud_clear_bad(pud);
}
+ err = apply_to_pmd_range(mm, pud, addr, next, fn, data, create);
+ if (err)
+ break;
} while (pud++, addr = next, addr != end);
+
return err;
}
@@ -2314,13 +2328,20 @@ static int apply_to_p4d_range(struct mm_struct *mm, pgd_t *pgd,
}
do {
next = p4d_addr_end(addr, end);
- if (create || !p4d_none_or_clear_bad(p4d)) {
- err = apply_to_pud_range(mm, p4d, addr, next, fn, data,
- create);
- if (err)
- break;
+ if (p4d_none(*p4d) && !create)
+ continue;
+ if (WARN_ON_ONCE(p4d_leaf(*p4d)))
+ return -EINVAL;
+ if (WARN_ON_ONCE(p4d_bad(*p4d))) {
+ if (!create)
+ continue;
+ p4d_clear_bad(p4d);
}
+ err = apply_to_pud_range(mm, p4d, addr, next, fn, data, create);
+ if (err)
+ break;
} while (p4d++, addr = next, addr != end);
+
return err;
}
@@ -2339,8 +2360,15 @@ static int __apply_to_page_range(struct mm_struct *mm, unsigned long addr,
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, end);
- if (!create && pgd_none_or_clear_bad(pgd))
+ if (pgd_none(*pgd) && !create)
continue;
+ if (WARN_ON_ONCE(pgd_leaf(*pgd)))
+ return -EINVAL;
+ if (WARN_ON_ONCE(pgd_bad(*pgd))) {
+ if (!create)
+ continue;
+ pgd_clear_bad(pgd);
+ }
err = apply_to_p4d_range(mm, pgd, addr, next, fn, data, create);
if (err)
break;
--
2.23.0
next prev parent reply other threads:[~2020-08-10 2:27 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-10 2:27 [PATCH v3 0/8] huge vmalloc mappings Nicholas Piggin
2020-08-10 2:27 ` [PATCH v3 1/8] mm/vmalloc: fix vmalloc_to_page for huge vmap mappings Nicholas Piggin
2020-08-10 2:27 ` Nicholas Piggin [this message]
2020-08-10 2:27 ` [PATCH v3 3/8] mm/vmalloc: rename vmap_*_range vmap_pages_*_range Nicholas Piggin
2020-08-10 2:27 ` [PATCH v3 4/8] lib/ioremap: rename ioremap_*_range to vmap_*_range Nicholas Piggin
2020-08-10 2:27 ` [PATCH v3 5/8] mm: HUGE_VMAP arch support cleanup Nicholas Piggin
2020-08-10 3:58 ` kernel test robot
2020-08-10 2:27 ` [PATCH v3 6/8] mm: Move vmap_range from lib/ioremap.c to mm/vmalloc.c Nicholas Piggin
2020-08-10 2:27 ` [PATCH v3 7/8] mm/vmalloc: add vmap_range_noflush variant Nicholas Piggin
2020-08-10 2:27 ` [PATCH v3 8/8] mm/vmalloc: Hugepage vmalloc mappings Nicholas Piggin
2020-08-12 12:25 ` Jonathan Cameron
2020-08-12 16:18 ` Jonathan Cameron
2020-08-11 16:32 ` [PATCH v3 0/8] huge " Jonathan Cameron
2020-08-12 1:07 ` Zefan Li
2020-08-12 8:11 ` Nicholas Piggin
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