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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2010-06-24 14:57:16 +0900
committerJames Morris <jmorris@namei.org>2010-08-02 15:34:45 +1000
commitf23571e866309a2048030ef6a5f0725cf139d4c9 (patch)
tree0116bcef462f367307b2db927b249b7ce21039c2 /Documentation/s390
parent5db5a39b6462c8360c9178b28f4b07c320dfca1c (diff)
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TOMOYO: Copy directly to userspace buffer.
When userspace program reads policy from /sys/kernel/security/tomoyo/ interface, TOMOYO uses line buffered mode. A line has at least one word. Commit 006dacc "TOMOYO: Support longer pathname." changed a word's max length from 4000 bytes to max kmalloc()able bytes. By that commit, a line's max length changed from 8192 bytes to more than max kmalloc()able bytes. Max number of words in a line remains finite. This patch changes the way of buffering so that all words in a line are firstly directly copied to userspace buffer as much as possible and are secondly queued for next read request. Words queued are guaranteed to be valid until /sys/kernel/security/tomoyo/ interface is close()d. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
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