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f2fs: remove write attribute of main_blkaddr sysfs node
[ Upstream commit ffcde4b ] Fuzzing main_blkaddr sysfs node will corrupt this field's value, causing kernel panic, remove its write attribute to avoid potential security risk. [Chao Yu: add description] Signed-off-by: Dehe Gu <gudehe@huawei.com> Signed-off-by: Daiyue Zhang <zhangdaiyue1@huawei.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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