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selftests/efivarfs: add check for disallowing file truncation

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Now that the ability of arbitrary writes to set the inode size is
fixed, verify that a variable file accepts a truncation operation but
does not change the stat size because of it.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
James Bottomley 2025-01-19 09:59:41 -05:00 committed by Ard Biesheuvel
parent 8b4bc207f9
commit 8a32d46b20
1 changed files with 23 additions and 0 deletions
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23
tools/testing/selftests/efivarfs/efivarfs.sh
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@ -202,6 +202,28 @@ test_invalid_filenames()
exit $ret
}
test_no_set_size()
{
local attrs='\x07\x00\x00\x00'
local file=$efivarfs_mount/$FUNCNAME-$test_guid
local ret=0
printf "$attrs\x00" > $file
[ -e $file -a -s $file ] || exit 1
chattr -i $file
: > $file
if [ $? != 0 ]; then
echo "variable file failed to accept truncation"
ret=1
elif [ -e $file -a ! -s $file ]; then
echo "file can be truncated to zero size"
ret=1
fi
rm $file || exit 1
exit $ret
}
check_prereqs
rc=0
@ -214,5 +236,6 @@ run_test test_zero_size_delete
run_test test_open_unlink
run_test test_valid_filenames
run_test test_invalid_filenames
run_test test_no_set_size
exit $rc