svn commit: r340701 - head/lib/csu/common
Ed Maste
emaste at FreeBSD.org
Tue Nov 20 20:59:50 UTC 2018
Author: emaste
Date: Tue Nov 20 20:59:49 2018
New Revision: 340701
URL: https://svnweb.freebsd.org/changeset/base/340701
Log:
Add NT_FREEBSD_FEATURE_CTL ELF note to csu
This note will be used to allow binaries to opt out of, or in to,
upcoming vulnerability mitigation and other features. It is not yet
connected but being added now to facilitate testing and ensure
compatibility with existing kernels and tools.
Reviewed by: brooks, jhb, kib, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D17438
Modified:
head/lib/csu/common/crtbrand.c
Modified: head/lib/csu/common/crtbrand.c
==============================================================================
--- head/lib/csu/common/crtbrand.c Tue Nov 20 20:40:10 2018 (r340700)
+++ head/lib/csu/common/crtbrand.c Tue Nov 20 20:59:49 2018 (r340701)
@@ -67,3 +67,18 @@ static const struct {
.name = NOTE_FREEBSD_VENDOR,
.desc = __FreeBSD_version
};
+
+static const struct {
+ int32_t namesz;
+ int32_t descsz;
+ int32_t type;
+ char name[sizeof(NOTE_FREEBSD_VENDOR)];
+ uint32_t desc[1];
+} crt_feature_ctl __attribute__ ((section (NOTE_SECTION),
+ aligned(4))) __used = {
+ .namesz = sizeof(NOTE_FREEBSD_VENDOR),
+ .descsz = sizeof(uint32_t),
+ .type = NT_FREEBSD_FEATURE_CTL,
+ .name = NOTE_FREEBSD_VENDOR,
+ .desc = { 0 }
+};
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