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authorH.J. Lu <hjl.tools@gmail.com>2018-09-12 08:40:59 -0700
committerH.J. Lu <hjl.tools@gmail.com>2018-09-12 08:41:26 -0700
commit5a274db4ea363d6b0b92933f085a92daaf1be2f2 (patch)
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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>
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--- 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.