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libselinux/utils: drop reachable assert in sefcontext_compile

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Resolves: RHEL-69451
This commit is contained in:
Petr Lautrbach 2024-12-04 19:38:06 +01:00
parent 6d5c5e5819
commit daf7971d4c
3 changed files with 62 additions and 1 deletions
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54
0002-libselinux-utils-drop-reachable-assert-in-sefcontext.patch Normal file
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@ -0,0 +1,54 @@
From ac0fc6d50077a6f33df9859322e13a2434070d4c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
Date: Tue, 3 Dec 2024 16:54:48 +0100
Subject: [PATCH] libselinux/utils: drop reachable assert in sefcontext_compile
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Content-type: text/plain
The two asserts following qsort(3) where useful during development to
ensure the comparison function and the corresponding pointer handling
were correct. They however do not take into account an empty file
context definition file containing no definitions and thus `stab->nel`
being NULL. Drop the two asserts.
Also return early to not depend on whether calloc(3) called with a size
of zero returns NULL or a special value.
Reported-by: Petr Lautrbach <lautrbach@redhat.com>
Closes: https://lore.kernel.org/selinux/87jzchqck5.fsf@redhat.com/
Fixes: 92306daf ("libselinux: rework selabel_file(5) database")
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Tested-by: Petr Lautrbach <lautrbach@redhat.com>
Acked-by: James Carter <jwcart2@gmail.com>
---
libselinux/utils/sefcontext_compile.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libselinux/utils/sefcontext_compile.c b/libselinux/utils/sefcontext_compile.c
index 23d312744016..e5da51ea12df 100644
--- a/libselinux/utils/sefcontext_compile.c
+++ b/libselinux/utils/sefcontext_compile.c
@@ -188,6 +188,9 @@ static int write_sidtab(FILE *bin_file, const struct sidtab *stab)
if (len != 1)
return -1;
+ if (stab->nel == 0)
+ return 0;
+
/* sort entries by id */
sids = calloc(stab->nel, sizeof(*sids));
if (!sids)
@@ -203,8 +206,6 @@ static int write_sidtab(FILE *bin_file, const struct sidtab *stab)
}
assert(index == stab->nel);
qsort(sids, stab->nel, sizeof(struct security_id), security_id_compare);
- assert(sids[0].id == 1);
- assert(sids[stab->nel - 1].id == stab->nel);
/* write raw contexts sorted by id */
for (uint32_t i = 0; i < stab->nel; i++) {
--
2.47.0

6
changelog
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@ -1,3 +1,9 @@
* Wed Dec 04 2024 Petr Lautrbach <lautrbach@redhat.com> - 3.8-0.rc1.2
- libselinux/utils: drop reachable assert in sefcontext_compile
* Thu Nov 28 2024 Petr Lautrbach <lautrbach@redhat.com> - 3.8-0.rc1.1
- SELinux userspace 3.8-rc1 release
* Tue Nov 12 2024 Vit Mojzis <vmojzis@redhat.com> - 3.7-5
- setexecfilecon: Remove useless rc check (RHEL-35586)
- matchpathcon: RESOURCE_LEAK: Variable "con" (RHEL-35584)

3
libselinux.spec
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@ -4,7 +4,7 @@
Summary: SELinux library and simple utilities
Name: libselinux
Version: 3.8
Release: 0.rc1.1%{?dist}
Release: 0.rc1.2%{?dist}
License: LicenseRef-Fedora-Public-Domain
# https://github.com/SELinuxProject/selinux/wiki/Releases
Source0: https://github.com/SELinuxProject/selinux/releases/download/%{version}-rc1/libselinux-%{version}-rc1.tar.gz
@ -20,6 +20,7 @@ Url: https://github.com/SELinuxProject/selinux/wiki
# $ i=1; for j in 00*patch; do printf "Patch%04d: %s\n" $i $j; i=$((i+1));done
# Patch list start
Patch0001: 0001-Use-SHA-2-instead-of-SHA-1.patch
Patch0002: 0002-libselinux-utils-drop-reachable-assert-in-sefcontext.patch
# Patch list end
BuildRequires: gcc make
BuildRequires: ruby-devel ruby libsepol-static >= %{libsepolver} swig pcre2-devel