Based on 0f99f74a14ef193c1ebde687c5cc76e1d67b85ef Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= Date: Tue, 26 Aug 2014 23:54:31 -0400 Subject: [PATCH] sd-journal: verify that object start with the field name If the journal is corrupted, we might return an object that does not start with the expected field name and/or is shorter than it should. --- src/journal/sd-journal.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git src/journal/sd-journal.c src/journal/sd-journal.c index 80ff8fe..693707c 100644 --- src/journal/sd-journal.c +++ src/journal/sd-journal.c @@ -2571,6 +2571,21 @@ _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_ if (r < 0) return r; + /* Check if we have at least the field name and "=". */ + if (ol <= k) { + log_debug("%s:offset " OFSfmt ": object has size %zu, expected at least %zu", + j->unique_file->path, j->unique_offset, + ol, k + 1); + return -EBADMSG; + } + + if (memcmp(odata, j->unique_field, k) || ((const char*) odata)[k] != '=') { + log_debug("%s:offset " OFSfmt ": object does not start with \"%s=\"", + j->unique_file->path, j->unique_offset, + j->unique_field); + return -EBADMSG; + } + /* OK, now let's see if we already returned this data * object by checking if it exists in the earlier * traversed files. */ -- 1.7.9.2