Messages in this thread Patch in this message | | | From | Tao Lan <> | Subject | [PATCH v2] printk: fix kernel msg leakage in s yslog print all function; | Date | Thu, 5 May 2022 02:52:10 +0000 |
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This function applies for memory but does not initialize the memory,and then invokes copy_to_user to copy the memory to the user space, which causes kernel information leaks.
[ 148.439660] kernel memory leak value 0xffffff80aed972bc at 0xffffffd37f00a000 to 0x704b883e74
Signed-off-by: Tao Lan <taolan@huawei.com> --- v2: to change to my correct name. kernel/printk/printk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index da03c15ecc89..22d7d821909d 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1591,7 +1591,7 @@ static int syslog_print_all(char __user *buf, int size, bool clear) u64 seq; bool time; - text = kmalloc(CONSOLE_LOG_MAX, GFP_KERNEL); + text = kzalloc(CONSOLE_LOG_MAX, GFP_KERNEL); if (!text) return -ENOMEM; -- 2.18.0.huawei.25
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