busybox #1033
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busybox #1033
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In minimal systems, /bin/sh is often a symlink to busybox. SELinux expects /bin/sh to be labeled shell_exec_t, so busybox bins can be labeled with shell_exec_t. Reference: https://git.yoctoproject.org/poky/tree/meta/recipes-core/busybox/busybox.inc#n251 Denials: [ 12.593748] audit: type=1400 audit(15.527:68): avc: denied { map } for pid=1477 comm="klogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:klogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627879] audit: type=1400 audit(15.527:68): avc: denied { read execute } for pid=1477 comm="klogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:klogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627894] audit: type=1400 audit(15.539:69): avc: denied { map } for pid=1480 comm="syslogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627897] audit: type=1400 audit(15.539:69): avc: denied { read execute } for pid=1480 comm="syslogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 labelling busybox bins as shell_exec_t, ensuring compatibility with refpolicy expectations and avoiding SELinux denials. Signed-off-by: Sasi Kumar Maddineni <quic_sasikuma@quicinc.com>
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Oct 15, 2025
In minimal systems, /bin/sh is often a symlink to busybox. SELinux expects /bin/sh to be labeled shell_exec_t, so busybox binaries can be labeled with shell_exec_t. Reference: https://git.yoctoproject.org/poky/tree/meta/recipes-core/busybox/busybox.inc#n251 Denials: [ 12.593748] audit: type=1400 audit(15.527:68): avc: denied { map } for pid=1477 comm="klogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:klogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627879] audit: type=1400 audit(15.527:68): avc: denied { read execute } for pid=1477 comm="klogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:klogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627894] audit: type=1400 audit(15.539:69): avc: denied { map } for pid=1480 comm="syslogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627897] audit: type=1400 audit(15.539:69): avc: denied { read execute } for pid=1480 comm="syslogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 labelling busybox binaries as shell_exec_t, ensuring compatibility with refpolicy expectations and avoiding SELinux denials. Upstream-Status: Submitted [SELinuxProject/refpolicy#1033] Signed-off-by: Sasi Kumar Maddineni <quic_sasikuma@quicinc.com>
sasikuma-qti
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to sasikuma-qti/meta-qcom-selinux
that referenced
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Oct 15, 2025
In minimal systems, /bin/sh is often a symlink to busybox. SELinux expects /bin/sh to be labeled shell_exec_t, so busybox binaries can be labeled with shell_exec_t. Reference: https://git.yoctoproject.org/poky/tree/meta/recipes-core/busybox/busybox.inc#n251 Denials: [ 12.593748] audit: type=1400 audit(15.527:68): avc: denied { map } for pid=1477 comm="klogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:klogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627879] audit: type=1400 audit(15.527:68): avc: denied { read execute } for pid=1477 comm="klogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:klogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627894] audit: type=1400 audit(15.539:69): avc: denied { map } for pid=1480 comm="syslogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 [ 12.627897] audit: type=1400 audit(15.539:69): avc: denied { read execute } for pid=1480 comm="syslogd" path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1 labelling busybox binaries as shell_exec_t, ensuring compatibility with refpolicy expectations and avoiding SELinux denials. Upstream-Status: Submitted [SELinuxProject/refpolicy#1033] Signed-off-by: Sasi Kumar Maddineni <quic_sasikuma@quicinc.com>
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cc @pebenito |
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I don't think this is the right choice. If you're executing the busybox binary directly, the intent is unknown, so # ls -lZ /usr/lib/busybox/usr/bin/sh
-rwxr-xr-x 1 root root system_u:object_r:shell_exec_t 25 Sep 30 23:20 /usr/lib/busybox/usr/bin/sh |
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In minimal systems, /bin/sh is often a symlink to busybox.
SELinux expects /bin/sh to be labeled shell_exec_t, so busybox bins
can be labeled with shell_exec_t.
Reference:
https://git.yoctoproject.org/poky/tree/meta/recipes-core/busybox/busybox.inc#n251
Denials:
[ 12.593748] audit: type=1400 audit(15.527:68): avc: denied { map } for pid=1477 comm="klogd" path="/usr/bin/busybox.nosuid"
dev="sda2" ino=359 scontext=system_u:system_r:klogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1
[ 12.627879] audit: type=1400 audit(15.527:68): avc: denied { read execute } for pid=1477 comm="klogd" path="/usr/bin/busybox.nosuid"
dev="sda2" ino=359 scontext=system_u:system_r:klogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1
[ 12.627894] audit: type=1400 audit(15.539:69): avc: denied { map } for pid=1480 comm="syslogd" path="/usr/bin/busybox.nosuid"
dev="sda2" ino=359 scontext=system_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1
[ 12.627897] audit: type=1400 audit(15.539:69): avc: denied { read execute } for pid=1480 comm="syslogd"
path="/usr/bin/busybox.nosuid" dev="sda2" ino=359 scontext=system_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1
labelling busybox bins as shell_exec_t, ensuring compatibility with
refpolicy expectations and avoiding SELinux denials.