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commit 2339d6a55eb7a7e040ae888e906adc49eeb59eab
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Wed Sep 12 08:40:59 2018 -0700
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i386: Use ENTRY and END in start.S [BZ #23606]
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Wrapping the _start function with ENTRY and END to insert ENDBR32 at
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function entry when CET is enabled. Since _start now includes CFI,
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without "cfi_undefined (eip)", unwinder may not terminate at _start
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and we will get
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Program received signal SIGSEGV, Segmentation fault.
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0xf7dc661e in ?? () from /lib/libgcc_s.so.1
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Missing separate debuginfos, use: dnf debuginfo-install libgcc-8.2.1-3.0.fc28.i686
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(gdb) bt
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#0 0xf7dc661e in ?? () from /lib/libgcc_s.so.1
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#1 0xf7dc7c18 in _Unwind_Backtrace () from /lib/libgcc_s.so.1
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#2 0xf7f0d809 in __GI___backtrace (array=array@entry=0xffffc7d0,
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size=size@entry=20) at ../sysdeps/i386/backtrace.c:127
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#3 0x08049254 in compare (p1=p1@entry=0xffffcad0, p2=p2@entry=0xffffcad4)
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at backtrace-tst.c:12
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#4 0xf7e2a28c in msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0,
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n=n@entry=2) at msort.c:65
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#5 0xf7e29f64 in msort_with_tmp (n=2, b=0xffffcad0, p=0xffffca5c)
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at msort.c:53
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#6 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=5)
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at msort.c:53
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#7 0xf7e29f64 in msort_with_tmp (n=5, b=0xffffcad0, p=0xffffca5c)
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at msort.c:53
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#8 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=10)
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at msort.c:53
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#9 0xf7e29f64 in msort_with_tmp (n=10, b=0xffffcad0, p=0xffffca5c)
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at msort.c:53
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#10 msort_with_tmp (p=p@entry=0xffffca5c, b=b@entry=0xffffcad0, n=n@entry=20)
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at msort.c:53
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#11 0xf7e2a5b6 in msort_with_tmp (n=20, b=0xffffcad0, p=0xffffca5c)
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at msort.c:297
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#12 __GI___qsort_r (b=b@entry=0xffffcad0, n=n@entry=20, s=s@entry=4,
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cmp=cmp@entry=0x8049230 <compare>, arg=arg@entry=0x0) at msort.c:297
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#13 0xf7e2a84d in __GI_qsort (b=b@entry=0xffffcad0, n=n@entry=20, s=s@entry=4,
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cmp=cmp@entry=0x8049230 <compare>) at msort.c:308
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#14 0x080490f6 in main (argc=2, argv=0xffffcbd4) at backtrace-tst.c:39
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FAIL: debug/backtrace-tst
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[BZ #23606]
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* sysdeps/i386/start.S: Include <sysdep.h>
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(_start): Use ENTRY/END to insert ENDBR32 at entry when CET is
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enabled. Add cfi_undefined (eip).
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Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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(cherry picked from commit 5a274db4ea363d6b0b92933f085a92daaf1be2f2)
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diff --git a/sysdeps/i386/start.S b/sysdeps/i386/start.S
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index 91035fa83fb7ee38..e35e9bd31b2cea30 100644
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--- a/sysdeps/i386/start.S
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+++ b/sysdeps/i386/start.S
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@@ -52,10 +52,11 @@
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NULL
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*/
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- .text
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- .globl _start
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- .type _start,@function
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-_start:
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+#include <sysdep.h>
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+
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+ENTRY (_start)
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+ /* Clearing frame pointer is insufficient, use CFI. */
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+ cfi_undefined (eip)
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/* Clear the frame pointer. The ABI suggests this be done, to mark
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the outermost frame obviously. */
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xorl %ebp, %ebp
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@@ -131,6 +132,7 @@ _start:
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1: movl (%esp), %ebx
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ret
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#endif
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+END (_start)
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/* To fulfill the System V/i386 ABI we need this symbol. Yuck, it's so
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meaningless since we don't support machines < 80386. */
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