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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2024-12-16 19:38:40 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-17 11:36:01 +0100 |
| commit | 414705c0303350d139b1dc18f329fe47dfb642dd (patch) | |
| tree | 826dfc7ef069d01095b594a8afdbd261ac0e4896 /security/tomoyo | |
| parent | 6f6e293246dc1f5b2b6b3d0f2d757598489cda79 (diff) | |
| download | linux-414705c0303350d139b1dc18f329fe47dfb642dd.tar.gz linux-414705c0303350d139b1dc18f329fe47dfb642dd.tar.bz2 linux-414705c0303350d139b1dc18f329fe47dfb642dd.zip | |
tomoyo: don't emit warning in tomoyo_write_control()
[ Upstream commit 3df7546fc03b8f004eee0b9e3256369f7d096685 ]
syzbot is reporting too large allocation warning at tomoyo_write_control(),
for one can write a very very long line without new line character. To fix
this warning, I use __GFP_NOWARN rather than checking for KMALLOC_MAX_SIZE,
for practically a valid line should be always shorter than 32KB where the
"too small to fail" memory-allocation rule applies.
One might try to write a valid line that is longer than 32KB, but such
request will likely fail with -ENOMEM. Therefore, I feel that separately
returning -EINVAL when a line is longer than KMALLOC_MAX_SIZE is redundant.
There is no need to distinguish over-32KB and over-KMALLOC_MAX_SIZE.
Reported-by: syzbot+7536f77535e5210a5c76@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=7536f77535e5210a5c76
Reported-by: Leo Stone <leocstone@gmail.com>
Closes: https://lkml.kernel.org/r/20241216021459.178759-2-leocstone@gmail.com
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'security/tomoyo')
| -rw-r--r-- | security/tomoyo/common.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c index 5c7b059a332a..972664962e8f 100644 --- a/security/tomoyo/common.c +++ b/security/tomoyo/common.c @@ -2665,7 +2665,7 @@ ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, if (head->w.avail >= head->writebuf_size - 1) { const int len = head->writebuf_size * 2; - char *cp = kzalloc(len, GFP_NOFS); + char *cp = kzalloc(len, GFP_NOFS | __GFP_NOWARN); if (!cp) { error = -ENOMEM; |