* [PATCH] printk: fix kernel msg leakage in syslog_print_all function；
@ 2022-05-05 2:05 taolan
0 siblings, 0 replies; only message in thread
From: taolan @ 2022-05-05 2:05 UTC (permalink / raw)
To: pmladek, senozhatsky, rostedt, john.ogness; +Cc: linux-kernel
From: t00264981 <taolan@huawei.com>
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: t00264981 <taolan@huawei.com>
---
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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2022-05-05 2:05 [PATCH] printk: fix kernel msg leakage in syslog_print_all function； taolan
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