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From 659cb59cd6cfe36c954c77f945c06a0cd8218287 Mon Sep 17 00:00:00 2001
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From: Petr Lautrbach <plautrba@redhat.com>
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Date: Mon, 15 Apr 2019 15:22:51 +0200
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Subject: [PATCH 2/2] mcstrans: Do not accept incomplete contexts
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Fixes:
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$ python3
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> import selinux
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> selinux.selinux_raw_context_to_color("xyz_u:xyz_r:xyz_t:")
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Traceback (most recent call last):
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File "<stdin>", line 2, in <module>
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OSError: [Errno 0] Error
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:: [ 10:25:45 ] :: [ BEGIN ] :: Running 'service mcstransd status'
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Redirecting to /bin/systemctl status mcstransd.service
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● mcstrans.service - Translates SELinux MCS/MLS labels to human readable form
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Loaded: loaded (/usr/lib/systemd/system/mcstrans.service; disabled; vendor preset: disabled)
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Active: failed (Result: core-dump) since Fri 2019-04-12 10:25:44 EDT; 1s ago
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Process: 16681 ExecStart=/sbin/mcstransd -f (code=dumped, signal=SEGV)
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Main PID: 16681 (code=dumped, signal=SEGV)
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systemd[1]: mcstrans.service: Main process exited, code=dumped, status=11/SEGV
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systemd[1]: mcstrans.service: Failed with result 'core-dump'.
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Signed-off-by: Petr Lautrbach <plautrba@redhat.com>
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---
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mcstrans/src/mcscolor.c | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/mcstrans/src/mcscolor.c b/mcstrans/src/mcscolor.c
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index 6ea1aa97..79fc1c8b 100644
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--- a/mcstrans/src/mcscolor.c
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+++ b/mcstrans/src/mcscolor.c
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@@ -272,10 +272,14 @@ static const unsigned precedence[N_COLOR][N_COLOR - 1] = {
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static const secolor_t default_color = { 0x000000, 0xffffff };
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static int parse_components(context_t con, char **components) {
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- components[COLOR_USER] = (char *)context_user_get(con);
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- components[COLOR_ROLE] = (char *)context_role_get(con);
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- components[COLOR_TYPE] = (char *)context_type_get(con);
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- components[COLOR_RANGE] = (char *)context_range_get(con);
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+ if ((components[COLOR_USER] = (char *)context_user_get(con)) == NULL)
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+ return -1;
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+ if ((components[COLOR_ROLE] = (char *)context_role_get(con)) == NULL)
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+ return -1;
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+ if ((components[COLOR_TYPE] = (char *)context_type_get(con)) == NULL)
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+ return -1;
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+ if ((components[COLOR_RANGE] = (char *)context_range_get(con)) == NULL)
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+ return -1;
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return 0;
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}
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--
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2.21.0
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