diff options
Diffstat (limited to 'meta/recipes-core/systemd/systemd/0025-journald-set-a-limit-on-the-number-of-fields-1k.patch')
-rw-r--r-- | meta/recipes-core/systemd/systemd/0025-journald-set-a-limit-on-the-number-of-fields-1k.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/meta/recipes-core/systemd/systemd/0025-journald-set-a-limit-on-the-number-of-fields-1k.patch b/meta/recipes-core/systemd/systemd/0025-journald-set-a-limit-on-the-number-of-fields-1k.patch new file mode 100644 index 0000000000..e8a6f2b986 --- /dev/null +++ b/meta/recipes-core/systemd/systemd/0025-journald-set-a-limit-on-the-number-of-fields-1k.patch @@ -0,0 +1,60 @@ +From 4566aaf97f5b4143b930d75628f3abc905249dcd Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl> +Date: Wed, 5 Dec 2018 22:45:02 +0100 +Subject: [PATCH] journald: set a limit on the number of fields (1k) + +We allocate a iovec entry for each field, so with many short entries, +our memory usage and processing time can be large, even with a relatively +small message size. Let's refuse overly long entries. + +CVE-2018-16865 +https://bugzilla.redhat.com/show_bug.cgi?id=1653861 + +What from I can see, the problem is not from an alloca, despite what the CVE +description says, but from the attack multiplication that comes from creating +many very small iovecs: (void* + size_t) for each three bytes of input message. + +Patch backported from systemd master at +052c57f132f04a3cf4148f87561618da1a6908b4. + +CVE: CVE-2018-16865 +Upstream-Status: Backport + +--- + src/basic/journal-importer.h | 3 +++ + src/journal/journald-native.c | 5 +++++ + 2 files changed, 8 insertions(+) + +diff --git a/src/basic/journal-importer.h b/src/basic/journal-importer.h +index f49ce734a1..c4ae45d32d 100644 +--- a/src/basic/journal-importer.h ++++ b/src/basic/journal-importer.h +@@ -16,6 +16,9 @@ + #define DATA_SIZE_MAX (1024*1024*768u) + #define LINE_CHUNK 8*1024u + ++/* The maximum number of fields in an entry */ ++#define ENTRY_FIELD_COUNT_MAX 1024 ++ + struct iovec_wrapper { + struct iovec *iovec; + size_t size_bytes; +diff --git a/src/journal/journald-native.c b/src/journal/journald-native.c +index 5ff22a10af..951d092053 100644 +--- a/src/journal/journald-native.c ++++ b/src/journal/journald-native.c +@@ -140,6 +140,11 @@ static int server_process_entry( + } + + /* A property follows */ ++ if (n > ENTRY_FIELD_COUNT_MAX) { ++ log_debug("Received an entry that has more than " STRINGIFY(ENTRY_FIELD_COUNT_MAX) " fields, ignoring entry."); ++ r = 1; ++ goto finish; ++ } + + /* n existing properties, 1 new, +1 for _TRANSPORT */ + if (!GREEDY_REALLOC(iovec, m, +-- +2.11.0 + |