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Linux 6.4.3

DISCUSSION Greg Kroah-Hartman 1 participant 2 messages Jul 11, 2023 Stable branch

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Greg Kroah-Hartman

author maintainer
#0 lore raw

I'm announcing the release of the 6.4.3 kernel.

All users of the 6.4 kernel series must upgrade.

The updated 6.4.y git tree can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-6.4.y
and can be browsed at the normal kernel.org git web browser:
https://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary

thanks,

greg k-h

------------

 Makefile                     |    2 +-
 include/linux/bootmem_info.h |    2 ++
 kernel/fork.c                |    1 +
 mm/memory.c                  |    7 +++++++
 mm/mmap.c                    |    6 ++++++
 5 files changed, 17 insertions(+), 1 deletion(-)

Greg Kroah-Hartman (1):

      Linux 6.4.3

Hugh Dickins (1):
mm: lock newly mapped VMA with corrected ordering

Liu Shixin (1):
bootmem: remove the vmemmap pages from kmemleak in free_bootmem_page

Peter Collingbourne (1):
mm: call arch_swap_restore() from do_swap_page()

Suren Baghdasaryan (3):
mm: lock a vma before stack expansion
mm: lock newly mapped VMA which can be modified after it becomes visible
fork: lock VMAs of the parent process when forking

author maintainer
#1 lore raw
Makefile +1 -1
index bcac81556b56..56abbcac061d 100644
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 VERSION = 6
 PATCHLEVEL = 4
-SUBLEVEL = 2
+SUBLEVEL = 3
 EXTRAVERSION =
 NAME = Hurr durr I'ma ninja sloth
include/linux/bootmem_info.h +2 -0
index cc35d010fa94..e1a3c9c9754c 100644
@@ -3,6 +3,7 @@
 #define __LINUX_BOOTMEM_INFO_H
 
 #include <linux/mm.h>
+#include <linux/kmemleak.h>
 
 /*
  * Types for free bootmem stored in page->lru.next. These have to be in

@@ -59,6 +60,7 @@ static inline void get_page_bootmem(unsigned long info, struct page *page,
 
 static inline void free_bootmem_page(struct page *page)
 {
+	kmemleak_free_part(page_to_virt(page), PAGE_SIZE);
 	free_reserved_page(page);
 }
 #endif
kernel/fork.c +1 -0
index 41c964104b58..8103ffd217e9 100644
@@ -690,6 +690,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
 	for_each_vma(old_vmi, mpnt) {
 		struct file *file;
 
+		vma_start_write(mpnt);
 		if (mpnt->vm_flags & VM_DONTCOPY) {
 			vm_stat_account(mm, mpnt->vm_flags, -vma_pages(mpnt));
 			continue;
mm/memory.c +7 -0
index 5ce82a76201d..07bab1e77499 100644
@@ -3932,6 +3932,13 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
 		}
 	}
 
+	/*
+	 * Some architectures may have to restore extra metadata to the page
+	 * when reading from swap. This metadata may be indexed by swap entry
+	 * so this must be called before swap_free().
+	 */
+	arch_swap_restore(entry, folio);
+
 	/*
 	 * Remove the swap entry and conditionally try to free up the swapcache.
 	 * We're already holding a reference on the page but haven't mapped it
mm/mmap.c +6 -0
index bc510361acec..30bf7772d4ac 100644
@@ -1975,6 +1975,8 @@ static int expand_upwards(struct vm_area_struct *vma, unsigned long address)
 		return -ENOMEM;
 	}
 
+	/* Lock the VMA before expanding to prevent concurrent page faults */
+	vma_start_write(vma);
 	/*
 	 * vma->vm_start/vm_end cannot change under us because the caller
 	 * is required to hold the mmap_lock in read mode.  We need the

@@ -2062,6 +2064,8 @@ int expand_downwards(struct vm_area_struct *vma, unsigned long address)
 		return -ENOMEM;
 	}
 
+	/* Lock the VMA before expanding to prevent concurrent page faults */
+	vma_start_write(vma);
 	/*
 	 * vma->vm_start/vm_end cannot change under us because the caller
 	 * is required to hold the mmap_lock in read mode.  We need the

@@ -2797,6 +2801,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 	if (vma_iter_prealloc(&vmi))
 		goto close_and_free_vma;
 
+	/* Lock the VMA since it is modified after insertion into VMA tree */
+	vma_start_write(vma);
 	if (vma->vm_file)
 		i_mmap_lock_write(vma->vm_file->f_mapping);