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* [glibc/release/2.32/master] x86: Set header.feature_1 in TCB for always-on CET [BZ #27177]
@ 2021-01-13 14:44 H.J. Lu
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From: H.J. Lu @ 2021-01-13 14:44 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=87450ecf8a80fa0572ec3a99abad30d11b5ccd4b
commit 87450ecf8a80fa0572ec3a99abad30d11b5ccd4b
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Jan 12 19:00:13 2021 -0800
x86: Set header.feature_1 in TCB for always-on CET [BZ #27177]
Update dl_cet_check() to set header.feature_1 in TCB when both IBT and
SHSTK are always on.
(cherry picked from commit 2ef23b520597f4ea1790a669b83e608f24f4cf12)
Diff:
---
NEWS | 1 +
sysdeps/x86/Makefile | 6 ++++++
sysdeps/x86/dl-cet.c | 5 ++++-
sysdeps/x86/tst-setjmp-cet.c | 1 +
4 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/NEWS b/NEWS
index 5c32a966b7..8b589b175b 100644
--- a/NEWS
+++ b/NEWS
@@ -21,6 +21,7 @@ The following bugs are resolved with this release:
[26853] aarch64: Missing unwind information in statically linked startup code
[26932] libc: sh: Multiple floating point functions defined as stubs only
[27130] "rep movsb" performance issue
+ [27177] GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't work
Version 2.32
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index a6736aef25..9736a13e7b 100644
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -12,6 +12,12 @@ endif
ifeq ($(subdir),setjmp)
gen-as-const-headers += jmp_buf-ssp.sym
sysdep_routines += __longjmp_cancel
+ifneq ($(enable-cet),no)
+ifneq ($(have-tunables),no)
+tests += tst-setjmp-cet
+tst-setjmp-cet-ENV = GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on
+endif
+endif
endif
ifeq ($(subdir),string)
diff --git a/sysdeps/x86/dl-cet.c b/sysdeps/x86/dl-cet.c
index 03572f7af6..3cc54a8d53 100644
--- a/sysdeps/x86/dl-cet.c
+++ b/sysdeps/x86/dl-cet.c
@@ -47,7 +47,10 @@ dl_cet_check (struct link_map *m, const char *program)
/* No legacy object check if both IBT and SHSTK are always on. */
if (enable_ibt_type == cet_always_on
&& enable_shstk_type == cet_always_on)
- return;
+ {
+ THREAD_SETMEM (THREAD_SELF, header.feature_1, GL(dl_x86_feature_1));
+ return;
+ }
/* Check if IBT is enabled by kernel. */
bool ibt_enabled
diff --git a/sysdeps/x86/tst-setjmp-cet.c b/sysdeps/x86/tst-setjmp-cet.c
new file mode 100644
index 0000000000..42c795d2a8
--- /dev/null
+++ b/sysdeps/x86/tst-setjmp-cet.c
@@ -0,0 +1 @@
+#include <setjmp/tst-setjmp.c>
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