BPF Archive on lore.kernel.org
 help / color / Atom feed
From: Daniel Borkmann <daniel@iogearbox.net>
To: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org, ast@kernel.org,
	andrii.nakryiko@gmail.com, john.fastabend@gmail.com,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andriin@fb.com>
Subject: [PATCH bpf-next v3 3/8] bpf: Make use of probe_user_write in probe write helper
Date: Sat,  2 Nov 2019 00:17:58 +0100
Message-ID: <841c461781874c07a0ee404a454c3bc0459eed30.1572649915.git.daniel@iogearbox.net> (raw)
In-Reply-To: <cover.1572649915.git.daniel@iogearbox.net>

Convert the bpf_probe_write_user() helper to probe_user_write() such that
writes are not attempted under KERNEL_DS anymore which is buggy as kernel
and user space pointers can have overlapping addresses. Also, given we have
the access_ok() check inside probe_user_write(), the helper doesn't need
to do it twice.

Fixes: 96ae52279594 ("bpf: Add bpf_probe_write_user BPF helper to be called in tracers")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
 kernel/trace/bpf_trace.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 571c25d60710..91eb17ac4bb6 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -163,7 +163,7 @@ static const struct bpf_func_proto bpf_probe_read_proto = {
 	.arg3_type	= ARG_ANYTHING,
-BPF_CALL_3(bpf_probe_write_user, void *, unsafe_ptr, const void *, src,
+BPF_CALL_3(bpf_probe_write_user, void __user *, unsafe_ptr, const void *, src,
 	   u32, size)
@@ -186,10 +186,8 @@ BPF_CALL_3(bpf_probe_write_user, void *, unsafe_ptr, const void *, src,
 		return -EPERM;
 	if (unlikely(!nmi_uaccess_okay()))
 		return -EPERM;
-	if (!access_ok(unsafe_ptr, size))
-		return -EPERM;
-	return probe_kernel_write(unsafe_ptr, src, size);
+	return probe_user_write(unsafe_ptr, src, size);
 static const struct bpf_func_proto bpf_probe_write_user_proto = {

  parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-01 23:17 [PATCH bpf-next v3 0/8] Fix BPF probe memory helpers Daniel Borkmann
2019-11-01 23:17 ` [PATCH bpf-next v3 1/8] uaccess: Add non-pagefault user-space write function Daniel Borkmann
2019-11-01 23:17 ` [PATCH bpf-next v3 2/8] uaccess: Add strict non-pagefault kernel-space read function Daniel Borkmann
2019-11-01 23:17 ` Daniel Borkmann [this message]
2019-11-01 23:17 ` [PATCH bpf-next v3 4/8] bpf: Add probe_read_{user,kernel} and probe_read_{user,kernel}_str helpers Daniel Borkmann
2019-11-01 23:18 ` [PATCH bpf-next v3 5/8] bpf: Switch BPF probe insns to bpf_probe_read_kernel Daniel Borkmann
2019-11-01 23:18 ` [PATCH bpf-next v3 6/8] bpf, samples: Use bpf_probe_read_user where appropriate Daniel Borkmann
2019-11-01 23:18 ` [PATCH bpf-next v3 7/8] bpf, testing: Convert prog tests to probe_read_{user,kernel}{,_str} helper Daniel Borkmann
2019-11-01 23:18 ` [PATCH bpf-next v3 8/8] bpf, testing: Add selftest to read/write sockaddr from user space Daniel Borkmann
2019-11-02 20:08 ` [PATCH bpf-next v3 0/8] Fix BPF probe memory helpers Alexei Starovoitov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=841c461781874c07a0ee404a454c3bc0459eed30.1572649915.git.daniel@iogearbox.net \
    --to=daniel@iogearbox.net \
    --cc=andrii.nakryiko@gmail.com \
    --cc=andriin@fb.com \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=john.fastabend@gmail.com \
    --cc=netdev@vger.kernel.org \


* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

BPF Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/bpf/0 bpf/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 bpf bpf/ https://lore.kernel.org/bpf \
	public-inbox-index bpf

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git