[PATCH 3/4] virt-aa-helper: Purge profile if corrupted

This commit aims to address the bug reported in [1] and [2]. If the profile is corrupted (0-size) the VM cannot be launched. To overcome this check if the profile exists and if it has 0 size remove it and create it again. [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890084 [2] https://bugs.launchpad.net/bugs/1927519 Signed-off-by: Ioanna Alifieraki <ioanna-maria.alifieraki(a)canonical.com&gt; --- src/security/virt-aa-helper.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/src/security/virt-aa-helper.c b/src/security/virt-aa-helper.c index 5ec0fb8807..5e13b29053 100644 --- a/src/security/virt-aa-helper.c +++ b/src/security/virt-aa-helper.c @@ -1489,6 +1489,7 @@ main(int argc, char **argv) int rc = -1; char *profile = NULL; char *include_file = NULL; + off_t size; if (virGettextInitialize() < 0 || virErrorInitialize() < 0) { @@ -1534,6 +1535,28 @@ main(int argc, char **argv) if (ctl->cmd == 'c' && virFileExists(profile)) vah_error(ctl, 1, _("profile exists")); + /* + * Rare cases can leave corrupted empty files behind breaking + * the guest. An empty file is never correct as virt-aa-helper + * would at least add the basic rules, therefore clean this up + * for a proper refresh. + */ + + if (virFileExists(profile)) { + size = virFileLength(profile, -1); + if (size == 0) { + char temp; + vah_warning(_("Profile of 0 size detected, will attempt to remove and re-create it")); + temp = ctl->cmd; + ctl->cmd = 'P'; + if ((rc = remove_profile(ctl, profile, include_file)) != 0) + vah_error(ctl, 1, _("could not remove corrupted profile")); + ctl->cmd = temp; + if ((rc = create_profile(ctl, profile, include_file)) != 0) + vah_error(ctl, 1, _("could not re-create profile")); + } + } + if (ctl->append && ctl->newfile) { if (vah_add_file(&buf, ctl->newfile, "rwk") != 0) goto cleanup; -- 2.17.1