https://github.com/torvalds/linux
Revision 309d08d9b3a3659ab3f239d27d4e38b670b08fc9 authored by Liu Zixian on 06 December 2020, 06:15:15 UTC, committed by Linus Torvalds on 06 December 2020, 18:19:07 UTC
On success, mmap should return the begin address of newly mapped area, but patch "mm: mmap: merge vma after call_mmap() if possible" set vm_start of newly merged vma to return value addr. Users of mmap will get wrong address if vma is merged after call_mmap(). We fix this by moving the assignment to addr before merging vma. We have a driver which changes vm_flags, and this bug is found by our testcases. Fixes: d70cec898324 ("mm: mmap: merge vma after call_mmap() if possible") Signed-off-by: Liu Zixian <liuzixian4@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: David Hildenbrand <david@redhat.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Hongxiang Lou <louhongxiang@huawei.com> Cc: Hu Shiyuan <hushiyuan@huawei.com> Cc: Matthew Wilcox <willy@infradead.org> Link: https://lkml.kernel.org/r/20201203085350.22624-1-liuzixian4@huawei.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tip revision: 309d08d9b3a3659ab3f239d27d4e38b670b08fc9 authored by Liu Zixian on 06 December 2020, 06:15:15 UTC
mm/mmap.c: fix mmap return value when vma is merged after call_mmap()
mm/mmap.c: fix mmap return value when vma is merged after call_mmap()
Tip revision: 309d08d
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arch | ||
block | ||
certs | ||
crypto | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | -rw-r--r-- | 16.3 KB |
.cocciconfig | -rw-r--r-- | 59 bytes |
.get_maintainer.ignore | -rw-r--r-- | 71 bytes |
.gitattributes | -rw-r--r-- | 62 bytes |
.gitignore | -rw-r--r-- | 1.8 KB |
.mailmap | -rw-r--r-- | 17.8 KB |
COPYING | -rw-r--r-- | 496 bytes |
CREDITS | -rw-r--r-- | 98.0 KB |
Kbuild | -rw-r--r-- | 1.3 KB |
Kconfig | -rw-r--r-- | 555 bytes |
MAINTAINERS | -rw-r--r-- | 562.7 KB |
Makefile | -rw-r--r-- | 62.6 KB |
README | -rw-r--r-- | 727 bytes |
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