[PATCH 5.10 032/130] kprobes: Limit max data_size of the kretprobe instances

Greg Kroah-Hartman
2021-12-06T15:39:38Z

From: Masami Hiramatsu <mhiramat@kernel.org>

commit 6bbfa44116689469267f1a6e3d233b52114139d2 upstream.

The 'kprobe::data_size' is unsigned, thus it can not be negative. But if
user sets it enough big number (e.g. (size_t)-8), the result of 'data_size
+ sizeof(struct kretprobe_instance)' becomes smaller than sizeof(struct
kretprobe_instance) or zero. In result, the kretprobe_instance are
allocated without enough memory, and kretprobe accesses outside of
allocated memory.

To avoid this issue, introduce a max limitation of the
kretprobe::data_size. 4KB per instance should be OK.

Link: https://lkml.kernel.org/r/163836995040.432120.10322772773821182925.stgit@devnote2

Cc: stable@vger.kernel.org
Fixes: f47cd9b553aa ("kprobes: kretprobe user entry-handler")
Reported-by: zhangyue <zhangyue1@kylinos.cn>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/linux/kprobes.h | 2 ++
kernel/kprobes.c | 3 +++
2 files changed, 5 insertions(+)

--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -155,6 +155,8 @@ struct kretprobe {
raw_spinlock_t lock;
};

+#define KRETPROBE_MAX_DATA_SIZE 4096
+
struct kretprobe_instance {
union {
struct hlist_node hlist;
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -2137,6 +2137,9 @@ int register_kretprobe(struct kretprobe
}
}

+ if (rp->data_size > KRETPROBE_MAX_DATA_SIZE)
+ return -E2BIG;
+
rp->kp.pre_handler = pre_handler_kretprobe;
rp->kp.post_handler = NULL;
rp->kp.fault_handler = NULL;