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TOMOYO: Copy directly to userspace buffer.

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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>
This commit is contained in:
Tetsuo Handa
2010-06-24 14:57:16 +09:00
committed by James Morris
parent 5db5a39b64
commit f23571e866
3 changed files with 510 additions and 470 deletions
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4
security/tomoyo/memory.c
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@@ -234,7 +234,7 @@ unsigned int tomoyo_quota_for_query;
*/
void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
{
if (!head->read_eof) {
if (!head->r.eof) {
const unsigned int policy
= atomic_read(&tomoyo_policy_memory_size);
const unsigned int query = tomoyo_query_memory_size;
@@ -258,7 +258,7 @@ void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
tomoyo_io_printf(head, "Query lists: %10u%s\n", query,
buffer);
tomoyo_io_printf(head, "Total: %10u\n", policy + query);
head->read_eof = true;
head->r.eof = true;
}
}