Ksawlii/kernel_samsung_a53x
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printk: Don't allow userspace to write to /dev/kmsg

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There is extensive spam in dmesg because of userspace.
This kills all "init", "healthd", "logd" messages in kernel logs and makes them
more readable.

Extracted from 59f163ac76.

Signed-off-by: idkwhoiam322 <idkwhoiam322@raphielgang.org>
Signed-off-by: prorooter007 <shreyashwasnik112@gmail.com>
Signed-off-by: celtare21 <celtare21@gmail.com>
This commit is contained in:
idkwhoiam322 2020-03-05 01:35:44 +05:30 committed by Ksawlii
parent 311d21b734
commit f434223a87
1 changed files with 3 additions and 0 deletions
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3
kernel/printk/printk.c
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@ -768,6 +768,9 @@ static ssize_t devkmsg_write(struct kiocb *iocb, struct iov_iter *from)
size_t len = iov_iter_count(from);
ssize_t ret = len;
/* Don't allow userspace to write to /dev/kmesg */
return len;
if (!user || len > LOG_LINE_MAX)
return -EINVAL;