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GNU C Library master sources branch master updated. glibc-2.28.9000-125-g5a274db
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- Date: 12 Sep 2018 15:42:10 -0000
- Subject: GNU C Library master sources branch master updated. glibc-2.28.9000-125-g5a274db
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=5a274db4ea363d6b0b92933f085a92daaf1be2f2
commit 5a274db4ea363d6b0b92933f085a92daaf1be2f2
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Sep 12 08:40:59 2018 -0700
i386: Use ENTRY and END in start.S [BZ #23606]
Wrapping the _start function with ENTRY and END to insert ENDBR32 at
function entry when CET is enabled. Since _start now includes CFI,
without "cfi_undefined (eip)", unwinder may not terminate at _start
and we will get
Program received signal SIGSEGV, Segmentation fault.
0xf7dc661e in ?? () from /lib/libgcc_s.so.1
Missing separate debuginfos, use: dnf debuginfo-install libgcc-8.2.1-3.0.fc28.i686
(gdb) bt
#0 0xf7dc661e in ?? () from /lib/libgcc_s.so.1
#1 0xf7dc7c18 in _Unwind_Backtrace () from /lib/libgcc_s.so.1
#2 0xf7f0d809 in __GI___backtrace (array=array@entry=0xffffc7d0,
size=size@entry=20) at ../sysdeps/i386/backtrace.c:127
#3 0x08049254 in compare (p1=p1@entry=0xffffcad0, p2=p2@entry=0xffffcad4)
at backtrace-tst.c:12
#4 0xf7e2a28c in msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0,
n=n@entry=2) at msort.c:65
#5 0xf7e29f64 in msort_with_tmp (n=2, b=0xffffcad0, p=0xffffca5c)
at msort.c:53
#6 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=5)
at msort.c:53
#7 0xf7e29f64 in msort_with_tmp (n=5, b=0xffffcad0, p=0xffffca5c)
at msort.c:53
#8 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=10)
at msort.c:53
#9 0xf7e29f64 in msort_with_tmp (n=10, b=0xffffcad0, p=0xffffca5c)
at msort.c:53
#10 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=20)
at msort.c:53
#11 0xf7e2a5b6 in msort_with_tmp (n=20, b=0xffffcad0, p=0xffffca5c)
at msort.c:297
#12 __GI___qsort_r (b=b@entry=0xffffcad0, n=n@entry=20, s=s@entry=4,
cmp=cmp@entry=0x8049230 <compare>, arg=arg@entry=0x0) at msort.c:297
#13 0xf7e2a84d in __GI_qsort (b=b@entry=0xffffcad0, n=n@entry=20, s=s@entry=4,
cmp=cmp@entry=0x8049230 <compare>) at msort.c:308
#14 0x080490f6 in main (argc=2, argv=0xffffcbd4) at backtrace-tst.c:39
FAIL: debug/backtrace-tst
[BZ #23606]
* sysdeps/i386/start.S: Include <sysdep.h>
(_start): Use ENTRY/END to insert ENDBR32 at entry when CET is
enabled. Add cfi_undefined (eip).
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
diff --git a/ChangeLog b/ChangeLog
index d1aff06..0df8aa5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2018-09-12 H.J. Lu <hongjiu.lu@intel.com>
+ Xuepeng Guo <xuepeng.guo@intel.com>
+
+ [BZ #23606]
+ * sysdeps/i386/start.S: Include <sysdep.h>
+ (_start): Use ENTRY/END to insert ENDBR32 at entry when CET is
+ enabled. Add cfi_undefined (eip).
+
2018-09-11 Joseph Myers <joseph@codesourcery.com>
* sysdeps/x86_64/fpu/math_private.h (MOVD): Remove macro.
diff --git a/sysdeps/i386/start.S b/sysdeps/i386/start.S
index 91035fa..e35e9bd 100644
--- a/sysdeps/i386/start.S
+++ b/sysdeps/i386/start.S
@@ -52,10 +52,11 @@
NULL
*/
- .text
- .globl _start
- .type _start,@function
-_start:
+#include <sysdep.h>
+
+ENTRY (_start)
+ /* Clearing frame pointer is insufficient, use CFI. */
+ cfi_undefined (eip)
/* Clear the frame pointer. The ABI suggests this be done, to mark
the outermost frame obviously. */
xorl %ebp, %ebp
@@ -131,6 +132,7 @@ _start:
1: movl (%esp), %ebx
ret
#endif
+END (_start)
/* To fulfill the System V/i386 ABI we need this symbol. Yuck, it's so
meaningless since we don't support machines < 80386. */
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 8 ++++++++
sysdeps/i386/start.S | 10 ++++++----
2 files changed, 14 insertions(+), 4 deletions(-)
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