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tty: n_gsm: require CAP_NET_ADMIN to attach N_GSM0710 ldisc
commit 67c3775689
upstream.
Any unprivileged user can attach N_GSM0710 ldisc, but it requires
CAP_NET_ADMIN to create a GSM network anyway.
Require initial namespace CAP_NET_ADMIN to do that.
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Link: https://lore.kernel.org/r/20230731185942.279611-1-cascardo@canonical.com
Cc: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 3 additions and 0 deletions
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@ -2567,6 +2567,9 @@ static int gsmld_open(struct tty_struct *tty)
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struct gsm_mux *gsm;
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int ret;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (tty->ops->write == NULL)
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return -EINVAL;
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