diff options
| author | Eric Biggers <ebiggers@google.com> | 2017-09-18 11:36:45 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-05 09:44:00 +0200 |
| commit | 47e8bd1965fc2bcee69a62a5cc2d5336b2e79835 (patch) | |
| tree | 985e8898e19078f07a1367302b5fc22b11dc963a /security/keys/key.c | |
| parent | 0c70fb88c7510784b12567e9ca5b848dd2b20395 (diff) | |
KEYS: fix writing past end of user-supplied buffer in keyring_read()
commit e645016abc803dafc75e4b8f6e4118f088900ffb upstream.
Userspace can call keyctl_read() on a keyring to get the list of IDs of
keys in the keyring. But if the user-supplied buffer is too small, the
kernel would write the full list anyway --- which will corrupt whatever
userspace memory happened to be past the end of the buffer. Fix it by
only filling the space that is available.
Fixes: b2a4df200d57 ("KEYS: Expand the capacity of a keyring")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security/keys/key.c')
0 files changed, 0 insertions, 0 deletions