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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-06-12 22:32:25 +0100 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-06-13 09:54:52 -0700 |
| commit | 993d0b287e2ef7bee2e8b13b0ce4d2b5066f278e (patch) | |
| tree | 853081efc2b49076ac29148901f66752393130ae /include | |
| parent | 57cd6d157eb479f0a8e820fd36b7240845c8a937 (diff) | |
| download | lwn-993d0b287e2ef7bee2e8b13b0ce4d2b5066f278e.tar.gz lwn-993d0b287e2ef7bee2e8b13b0ce4d2b5066f278e.zip | |
usercopy: Handle vm_map_ram() areas
vmalloc does not allocate a vm_struct for vm_map_ram() areas. That causes
us to deny usercopies from those areas. This affects XFS which uses
vm_map_ram() for its directories.
Fix this by calling find_vmap_area() instead of find_vm_area().
Fixes: 0aef499f3172 ("mm/usercopy: Detect vmalloc overruns")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Tested-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220612213227.3881769-2-willy@infradead.org
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/vmalloc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index b159c2789961..096d48aa3437 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -215,6 +215,7 @@ extern struct vm_struct *__get_vm_area_caller(unsigned long size, void free_vm_area(struct vm_struct *area); extern struct vm_struct *remove_vm_area(const void *addr); extern struct vm_struct *find_vm_area(const void *addr); +struct vmap_area *find_vmap_area(unsigned long addr); static inline bool is_vm_area_hugepages(const void *addr) { |