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From 7981593bf083801035b1f1377661849805acb216 Mon Sep 17 00:00:00 2001
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Petr Mladek |
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From: Joe Perches <joe@perches.com>
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Petr Mladek |
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Date: Wed, 16 Sep 2020 13:40:43 -0700
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Subject: [PATCH] mm: and drivers core: Convert hugetlb_report_node_meminfo to
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sysfs_emit
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Git-commit: 7981593bf083801035b1f1377661849805acb216
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Patch-mainline: v5.10-rc1
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References: bsc#1200598 CVE-2022-20166
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Convert the unbound sprintf in hugetlb_report_node_meminfo to use
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sysfs_emit_at so that no possible overrun of a PAGE_SIZE buf can occur.
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Signed-off-by: Joe Perches <joe@perches.com>
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Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
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Link: https://lore.kernel.org/r/894b351b82da6013cde7f36ff4b5493cd0ec30d0.1600285923.git.joe@perches.com
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Acked-by: Petr Mladek <pmladek@suse.com>
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---
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drivers/base/node.c | 2 +-
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include/linux/hugetlb.h | 4 ++--
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mm/hugetlb.c | 4 ++--
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3 files changed, 5 insertions(+), 5 deletions(-)
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--- a/drivers/base/node.c
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+++ b/drivers/base/node.c
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@@ -143,7 +143,7 @@ static ssize_t node_read_meminfo(struct
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#else
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nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
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#endif
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- len += hugetlb_report_node_meminfo(nid, buf + len);
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+ len += hugetlb_report_node_meminfo(buf, len, nid);
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return len;
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}
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--- a/include/linux/hugetlb.h
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+++ b/include/linux/hugetlb.h
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@@ -77,7 +77,7 @@ void __unmap_hugepage_range(struct mmu_g
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unsigned long start, unsigned long end,
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struct page *ref_page);
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void hugetlb_report_meminfo(struct seq_file *);
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-int hugetlb_report_node_meminfo(int, char *);
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+int hugetlb_report_node_meminfo(char *buf, int len, int nid);
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void hugetlb_show_meminfo(void);
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unsigned long hugetlb_total_pages(void);
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int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
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@@ -157,7 +157,7 @@ static inline void adjust_range_if_pmd_s
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static inline void hugetlb_report_meminfo(struct seq_file *m)
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{
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}
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-#define hugetlb_report_node_meminfo(n, buf) 0
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+#define hugetlb_report_node_meminfo(buf, len, nid) 0
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static inline void hugetlb_show_meminfo(void)
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{
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}
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--- a/mm/hugetlb.c
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+++ b/mm/hugetlb.c
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@@ -3050,12 +3050,12 @@ void hugetlb_report_meminfo(struct seq_f
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1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
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}
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-int hugetlb_report_node_meminfo(int nid, char *buf)
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+int hugetlb_report_node_meminfo(char *buf, int len, int nid)
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{
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struct hstate *h = &default_hstate;
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if (!hugepages_supported())
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return 0;
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- return sprintf(buf,
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+ return sysfs_emit_at(buf, len,
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"Node %d HugePages_Total: %5u\n"
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"Node %d HugePages_Free: %5u\n"
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"Node %d HugePages_Surp: %5u\n",
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