diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-core/dbus/dbus/CVE-2022-42011.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-core/dbus/dbus/CVE-2022-42011.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-core/dbus/dbus/CVE-2022-42011.patch b/meta-openbmc-mods/meta-common/recipes-core/dbus/dbus/CVE-2022-42011.patch new file mode 100644 index 000000000..9284dd666 --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-core/dbus/dbus/CVE-2022-42011.patch @@ -0,0 +1,55 @@ +From 079bbf16186e87fb0157adf8951f19864bc2ed69 Mon Sep 17 00:00:00 2001 +From: Simon McVittie <smcv@collabora.com> +Date: Mon, 12 Sep 2022 13:14:18 +0100 +Subject: [PATCH] dbus-marshal-validate: Validate length of arrays of + fixed-length items + +This fast-path previously did not check that the array was made up +of an integer number of items. This could lead to assertion failures +and out-of-bounds accesses during subsequent message processing (which +assumes that the message has already been validated), particularly after +the addition of _dbus_header_remove_unknown_fields(), which makes it +more likely that dbus-daemon will apply non-trivial edits to messages. + +Thanks: Evgeny Vereshchagin +Fixes: e61f13cf "Bug 18064 - more efficient validation for fixed-size type arrays" +Resolves: https://gitlab.freedesktop.org/dbus/dbus/-/issues/413 +Resolves: CVE-2022-42011 +Signed-off-by: Simon McVittie <smcv@collabora.com> +--- + dbus/dbus-marshal-validate.c | 13 ++++++++++++- + 1 file changed, 12 insertions(+), 1 deletion(-) + +diff --git a/dbus/dbus-marshal-validate.c b/dbus/dbus-marshal-validate.c +index ae68414dd..7d0d6cf72 100644 +--- a/dbus/dbus-marshal-validate.c ++++ b/dbus/dbus-marshal-validate.c +@@ -503,13 +503,24 @@ validate_body_helper (DBusTypeReader *reader, + */ + if (dbus_type_is_fixed (array_elem_type)) + { ++ /* Note that fixed-size types all have sizes equal to ++ * their alignments, so this is really the item size. */ ++ alignment = _dbus_type_get_alignment (array_elem_type); ++ _dbus_assert (alignment == 1 || alignment == 2 || ++ alignment == 4 || alignment == 8); ++ ++ /* Because the alignment is a power of 2, this is ++ * equivalent to: (claimed_len % alignment) != 0, ++ * but avoids slower integer division */ ++ if ((claimed_len & (alignment - 1)) != 0) ++ return DBUS_INVALID_ARRAY_LENGTH_INCORRECT; ++ + /* bools need to be handled differently, because they can + * have an invalid value + */ + if (array_elem_type == DBUS_TYPE_BOOLEAN) + { + dbus_uint32_t v; +- alignment = _dbus_type_get_alignment (array_elem_type); + + while (p < array_end) + { +-- +GitLab + |