This is a note to let you know that I've just added the patch titled
ptrace: Prevent kernel-infoleak in ptrace_get_syscall_info()
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ptrace-prevent-kernel-infoleak-in-ptrace_get_syscall_info.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0032ce0f85a269a006e91277be5fdbc05fad8426 Mon Sep 17 00:00:00 2001
From: Peilin Ye <yepeilin.cs@xxxxxxxxx>
Date: Sat, 1 Aug 2020 11:20:44 -0400
Subject: ptrace: Prevent kernel-infoleak in ptrace_get_syscall_info()
From: Peilin Ye <yepeilin.cs@xxxxxxxxx>
commit 0032ce0f85a269a006e91277be5fdbc05fad8426 upstream.
ptrace_get_syscall_info() is potentially copying uninitialized stack
memory to userspace, since the compiler may leave a 3-byte hole near the
beginning of `info`. Fix it by adding a padding field to `struct
ptrace_syscall_info`.
Fixes: 201766a20e30 ("ptrace: add PTRACE_GET_SYSCALL_INFO request")
Suggested-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Peilin Ye <yepeilin.cs@xxxxxxxxx>
Reviewed-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20200801152044.230416-1-yepeilin.cs@xxxxxxxxx
Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/uapi/linux/ptrace.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/include/uapi/linux/ptrace.h
+++ b/include/uapi/linux/ptrace.h
@@ -81,7 +81,8 @@ struct seccomp_metadata {
struct ptrace_syscall_info {
__u8 op; /* PTRACE_SYSCALL_INFO_* */
- __u32 arch __attribute__((__aligned__(sizeof(__u32))));
+ __u8 pad[3];
+ __u32 arch;
__u64 instruction_pointer;
__u64 stack_pointer;
union {
Patches currently in stable-queue which might be from yepeilin.cs@xxxxxxxxx are
queue-5.9/ptrace-prevent-kernel-infoleak-in-ptrace_get_syscall_info.patch
