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[3.10] bpo-44493: Add missing terminated NUL in sockaddr_un's length (GH-26866) (GH-32140)

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Add missing terminated NUL in sockaddr_un's length

- Linux: https://man7.org/linux/man-pages/man7/unix.7.html
- *BSD: SUN_LEN
(cherry picked from commit f6b3a07b7d)


Co-authored-by: ty <zonyitoo@users.noreply.github.com>

Automerge-Triggered-By: GH:gpshead
This commit is contained in:
Miss Islington (bot) 2022-03-28 11:26:49 -07:00 • committed by GitHub
parent 9194a7b899
commit 5944807b09
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2 changed files with 9 additions and 1 deletions
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3
Misc/NEWS.d/next/Library/2021-07-26-10-46-49.bpo-44493.xp3CRH.rst Normal file
View file

@ -0,0 +1,3 @@
Add missing terminated NUL in sockaddr_un's length
This was potentially observable when using non-abstract AF_UNIX datagram sockets to processes written in another programming language.

7
Modules/socketmodule.c
View file

@ -1680,6 +1680,8 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
"AF_UNIX path too long");
goto unix_out;
}
*len_ret = path.len + offsetof(struct sockaddr_un, sun_path);
}
else
#endif /* linux */
@ -1691,10 +1693,13 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
goto unix_out;
}
addr->sun_path[path.len] = 0;
/* including the tailing NUL */
*len_ret = path.len + offsetof(struct sockaddr_un, sun_path) + 1;
}
addr->sun_family = s->sock_family;
memcpy(addr->sun_path, path.buf, path.len);
*len_ret = path.len + offsetof(struct sockaddr_un, sun_path);
retval = 1;
unix_out:
PyBuffer_Release(&path);