]> www.infradead.org Git - users/jedix/linux-maple.git/commit
/proc/kpageflags: prevent an integer overflow in stable_page_flags()
authorToshiki Fukasawa <t-fukasawa@vx.jp.nec.com>
Thu, 14 Apr 2022 06:06:54 +0000 (23:06 -0700)
committerakpm <akpm@linux-foundation.org>
Thu, 14 Apr 2022 06:06:54 +0000 (23:06 -0700)
commit8a91ace3bce8c5499206f0e4a9240119aee8c3c7
tree240b28a349a7f67fbb692c9ad54d18f9947a7eb4
parentbba7ece82c62908d3e96c8c3d8043e9c62234b72
/proc/kpageflags: prevent an integer overflow in stable_page_flags()

stable_page_flags() returns kpageflags info in u64, but it uses "1 <<
KPF_*" internally which is considered as int.  This type mismatch causes
no visible problem now, but it will if you set bit 32 or more as done in a
subsequent patch.  So use BIT_ULL in order to avoid future overflow
issues.

Link: http://lkml.kernel.org/r/20190725023100.31141-2-t-fukasawa@vx.jp.nec.com
Signed-off-by: Toshiki Fukasawa <t-fukasawa@vx.jp.nec.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Junichi Nomura <j-nomura@ce.jp.nec.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
fs/proc/page.c