linux-modules.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Yauheni Kaliuta <ykaliuta@redhat.com>
To: linux-modules@vger.kernel.org
Cc: lucas.de.marchi@gmail.com, Yauheni Kaliuta <ykaliuta@redhat.com>
Subject: [PATCH 2/2] libkmod-builtin: consider final NIL in name length check
Date: Tue,  8 Jun 2021 09:29:23 +0300	[thread overview]
Message-ID: <20210608062923.94017-2-ykaliuta@redhat.com> (raw)
In-Reply-To: <20210608062923.94017-1-ykaliuta@redhat.com>

There is potential buffer overrun in kmod_builtin_iter_get_modname()
for the name of length PATH_MAX. The required buffer size is
PATH_MAX, so `modname[len] = '\0'` with len == PATH_MAX will write
right beyond the buffer.

Check the length against PATH_MAX - 1.

Signed-off-by: Yauheni Kaliuta <ykaliuta@redhat.com>
---
 libkmod/libkmod-builtin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libkmod/libkmod-builtin.c b/libkmod/libkmod-builtin.c
index a002cb5ee2c6..3d4d77ab29b3 100644
--- a/libkmod/libkmod-builtin.c
+++ b/libkmod/libkmod-builtin.c
@@ -246,7 +246,7 @@ bool kmod_builtin_iter_get_modname(struct kmod_builtin_iter *iter,
 
 	len = dot - line;
 
-	if (len >= PATH_MAX) {
+	if (len >= PATH_MAX - 1) {
 		sv_errno = ENAMETOOLONG;
 		goto fail;
 	}
-- 
2.31.1


  reply	other threads:[~2021-06-08  6:29 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08  6:28 [PATCH 0/2] Fix a couple of potential problem (static analysis) Yauheni Kaliuta
2021-06-08  6:29 ` [PATCH 1/2] libkmod-module: check "new_from_name" return value in get_builtin Yauheni Kaliuta
2021-06-08  6:29   ` Yauheni Kaliuta [this message]
2021-06-09 17:10     ` [PATCH 2/2] libkmod-builtin: consider final NIL in name length check Lucas De Marchi
2021-06-09 17:18       ` Lucas De Marchi
2021-06-22  6:31         ` Yauheni Kaliuta
2021-06-22  6:22       ` Yauheni Kaliuta
2021-06-09 17:22   ` [PATCH 1/2] libkmod-module: check "new_from_name" return value in get_builtin Lucas De Marchi

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:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

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

  git send-email \
    --in-reply-to=20210608062923.94017-2-ykaliuta@redhat.com \
    --to=ykaliuta@redhat.com \
    --cc=linux-modules@vger.kernel.org \
    --cc=lucas.de.marchi@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).