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From 4b0ebd414553f9ccab85dfd708bf808127da505f Mon Sep 17 00:00:00 2001
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From: Michal Sekletar <msekleta@redhat.com>
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Date: Wed, 16 Jan 2019 10:24:56 +0100
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Subject: [PATCH] journald: free cmdline buffers owned by iovec
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Resolves: #1666646
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[msekleta: this is a followup for the fix of CVE-2018-16864. While
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backporting upstream changes I've accidentally dropped the automatic
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cleanup of the cmdline buffers. Technically speaking similar issue is in
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coredump.c too, but after we dispatch iovec buffer in coredump.c we
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immediately exit so allocated memory is reclaimed by the kernel.]
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---
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src/journal/journald-server.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
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index c35858247b..88d8f3e41d 100644
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--- a/src/journal/journald-server.c
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+++ b/src/journal/journald-server.c
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@@ -738,6 +738,7 @@ static void dispatch_message_real(
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o_uid[sizeof("OBJECT_UID=") + DECIMAL_STR_MAX(uid_t)],
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o_gid[sizeof("OBJECT_GID=") + DECIMAL_STR_MAX(gid_t)],
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o_owner_uid[sizeof("OBJECT_SYSTEMD_OWNER_UID=") + DECIMAL_STR_MAX(uid_t)];
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+ _cleanup_free_ char *cmdline1 = NULL, *cmdline2 = NULL;
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uid_t object_uid;
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gid_t object_gid;
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char *x;
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@@ -790,7 +791,7 @@ static void dispatch_message_real(
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if (r >= 0) {
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/* At most _SC_ARG_MAX (2MB usually), which is too much to put on stack.
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* Let's use a heap allocation for this one. */
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- set_iovec_field_free(iovec, &n, "_CMDLINE=", t);
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+ cmdline1 = set_iovec_field_free(iovec, &n, "_CMDLINE=", t);
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}
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r = get_process_capeff(ucred->pid, &t);
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@@ -916,7 +917,7 @@ static void dispatch_message_real(
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r = get_process_cmdline(object_pid, 0, false, &t);
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if (r >= 0)
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- set_iovec_field_free(iovec, &n, "OBJECT_CMDLINE=", t);
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+ cmdline2 = set_iovec_field_free(iovec, &n, "OBJECT_CMDLINE=", t);
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#ifdef HAVE_AUDIT
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r = audit_session_from_pid(object_pid, &audit);
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