moonjuice/kernel_arpi
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ANDROID: mm: avoid using vmacache in lockless vma search

Browse Source 
When searching vma under RCU protection vmcache should be avoided because
a race with munmap() might result in finding a vma and placing it into
vmcache after munmap() removed that vma and called vmcache_invalidate.
Once that vma is freed, vmcache will be left with an invalid vma pointer.

Bug: 257443051
Change-Id: I62438305fcf5139974f4f7d3bae5b22c74084a59
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan
2022-11-21 14:08:41 -08:00
parent 533a88fed7
commit ca96bd7bf1
4 changed files with 41 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/mm.h
View File

@@ -2734,6 +2734,8 @@ extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
#define expand_upwards(vma, address) (0)
#endif
extern struct vm_area_struct *find_vma_from_tree(struct mm_struct *mm,
unsigned long addr);
/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
extern struct vm_area_struct * __find_vma(struct mm_struct * mm, unsigned long addr);
extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,