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author | Mimi Zohar <zohar@linux.ibm.com> | 2019-08-25 15:58:16 +0200 |
---|---|---|
committer | Mimi Zohar <zohar@linux.ibm.com> | 2019-08-29 18:45:30 +0200 |
commit | cbc0425d3dd370a6f0bf23589dc7b6955a53a9ce (patch) | |
tree | 0d3fe5ed0859d442d225a26f6b25550f86f2c686 /tools/testing | |
parent | ima: Fix use after free in ima_read_modsig() (diff) | |
download | linux-cbc0425d3dd370a6f0bf23589dc7b6955a53a9ce.tar.xz linux-cbc0425d3dd370a6f0bf23589dc7b6955a53a9ce.zip |
sefltest/ima: support appended signatures (modsig)
In addition to the PE/COFF and IMA xattr signatures, the kexec kernel
image can be signed with an appended signature, using the same
scripts/sign-file tool that is used to sign kernel modules.
This patch adds support for detecting a kernel image signed with an
appended signature and updates the existing test messages
appropriately.
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Jordan Hand <jorhand@linux.microsoft.com> (x86_64 QEMU)
Tested-by: Jordan Hand <jorhand@linux.microsoft.com> (x86_64 QEMU)
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'tools/testing')
-rwxr-xr-x | tools/testing/selftests/kexec/test_kexec_file_load.sh | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/tools/testing/selftests/kexec/test_kexec_file_load.sh b/tools/testing/selftests/kexec/test_kexec_file_load.sh index fa7c24e8eefb..2ff600388c30 100755 --- a/tools/testing/selftests/kexec/test_kexec_file_load.sh +++ b/tools/testing/selftests/kexec/test_kexec_file_load.sh @@ -37,11 +37,20 @@ is_ima_sig_required() # sequentially. As a result, a policy rule may be defined, but # might not necessarily be used. This test assumes if a policy # rule is specified, that is the intent. + + # First check for appended signature (modsig), then xattr if [ $ima_read_policy -eq 1 ]; then check_ima_policy "appraise" "func=KEXEC_KERNEL_CHECK" \ - "appraise_type=imasig" + "appraise_type=imasig|modsig" ret=$? - [ $ret -eq 1 ] && log_info "IMA signature required"; + if [ $ret -eq 1 ]; then + log_info "IMA or appended(modsig) signature required" + else + check_ima_policy "appraise" "func=KEXEC_KERNEL_CHECK" \ + "appraise_type=imasig" + ret=$? + [ $ret -eq 1 ] && log_info "IMA signature required"; + fi fi return $ret } @@ -84,6 +93,22 @@ check_for_imasig() return $ret } +# Return 1 for appended signature (modsig) found and 0 for not found. +check_for_modsig() +{ + local module_sig_string="~Module signature appended~" + local sig="$(tail --bytes $((${#module_sig_string} + 1)) $KERNEL_IMAGE)" + local ret=0 + + if [ "$sig" == "$module_sig_string" ]; then + ret=1 + log_info "kexec kernel image modsig signed" + else + log_info "kexec kernel image not modsig signed" + fi + return $ret +} + kexec_file_load_test() { local succeed_msg="kexec_file_load succeeded" @@ -98,7 +123,8 @@ kexec_file_load_test() # In secureboot mode with an architecture specific # policy, make sure either an IMA or PE signature exists. if [ $secureboot -eq 1 ] && [ $arch_policy -eq 1 ] && \ - [ $ima_signed -eq 0 ] && [ $pe_signed -eq 0 ]; then + [ $ima_signed -eq 0 ] && [ $pe_signed -eq 0 ] \ + && [ $ima_modsig -eq 0 ]; then log_fail "$succeed_msg (missing sig)" fi @@ -107,7 +133,8 @@ kexec_file_load_test() log_fail "$succeed_msg (missing PE sig)" fi - if [ $ima_sig_required -eq 1 ] && [ $ima_signed -eq 0 ]; then + if [ $ima_sig_required -eq 1 ] && [ $ima_signed -eq 0 ] \ + && [ $ima_modsig -eq 0 ]; then log_fail "$succeed_msg (missing IMA sig)" fi @@ -204,5 +231,8 @@ pe_signed=$? check_for_imasig ima_signed=$? +check_for_modsig +ima_modsig=$? + # Test loading the kernel image via kexec_file_load syscall kexec_file_load_test |