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Fix race condition in loop device setup in mount regression test

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Calling losetup -f first and passing its result to create the loop device
creates a race condition in which the loop device might be claimed first
in between the two losetup calls. Instead, create the device atomically
and then obtain the loop device /dev/ handle afterwards.

Signed-off-by: Ryan Lee <ryan.lee@canonical.com>
This commit is contained in:
Ryan Lee 2024-12-03 13:04:16 -08:00
parent 5fb91616e3
commit 95f3bdf66b
1 changed files with 2 additions and 2 deletions
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4
tests/regression/apparmor/mount.sh
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@ -77,8 +77,8 @@ if [ ! -b /dev/loop0 ] ; then
fi
# find the next free loop device and mount it
loop_device=$(losetup -f) || fatalerror 'Unable to find a free loop device'
/sbin/losetup "$loop_device" ${mount_file} > /dev/null 2> /dev/null
/sbin/losetup -f ${mount_file} || fatalerror 'Unable to set up a loop device'
loop_device="$(/sbin/losetup -n -O NAME -l -j ${mount_file})"
options=(
# default and non-default options