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stm class: Prevent user-controllable allocations

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Currently, the character device write method allocates a temporary buffer
for user's data, but the user's data size is not sanitized and can cause
arbitrarily large allocations via kzalloc() or an integer overflow that
will then result in overwriting kernel memory.

This patch trims the input buffer size to avoid these issues.

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit f08b18266c)
This commit is contained in:
Alexander Shishkin
2015-12-22 17:25:21 +02:00
committed by Mathieu Poirier
parent 0f049c5ab8
commit 1caf1d3016
1 changed files with 3 additions and 0 deletions
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3
drivers/hwtracing/stm/core.c
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@@ -406,6 +406,9 @@ static ssize_t stm_char_write(struct file *file, const char __user *buf,
char *kbuf;
int err;
if (count + 1 > PAGE_SIZE)
count = PAGE_SIZE - 1;
/*
* if no m/c have been assigned to this writer up to this
* point, use "default" policy entry