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dissect: avoid overflow access by NULLSTR_FOREACH

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NULLSTR_FOREACH expects two terminating NULs, but the joined string
for extension-release.d only had the canonical one.
Use a placeholder when joining and fix it manually.
This commit is contained in:
Luca Boccassi 2021-03-05 20:19:44 +00:00 committed by Yu Watanabe
parent 07a7441a1c
commit 4f67a5d923
1 changed files with 5 additions and 3 deletions
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8
src/shared/dissect-image.c
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@ -2270,9 +2270,11 @@ int dissected_image_acquire_metadata(DissectedImage *m) {
/* As per the os-release spec, if the image is an extension it will have a file
* named after the image name in extension-release.d/ */
if (m->image_name)
paths[META_EXTENSION_RELEASE] = strjoina("/usr/lib/extension-release.d/extension-release.", m->image_name);
else
if (m->image_name) {
char *ext = strjoina("/usr/lib/extension-release.d/extension-release.", m->image_name, "0");
ext[strlen(ext) - 1] = '\0'; /* Extra \0 for NULSTR_FOREACH using placeholder from above */
paths[META_EXTENSION_RELEASE] = ext;
} else
log_debug("No image name available, will skip extension-release metadata");
for (; n_meta_initialized < _META_MAX; n_meta_initialized ++) {