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69 lines
1.9 KiB
69 lines
1.9 KiB
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Keith Seitz <keiths@redhat.com>
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Date: Mon, 27 Jul 2020 17:27:39 -0400
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Subject: gdb-rhbz1842691-corefile-mem-access-5of15.patch
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;; Test ability to access unwritten-to mmap data in core file
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;; Kevin Buettner, RH BZ 1842961
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Author: Kevin Buettner <kevinb@redhat.com>
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Date: Wed Mar 4 17:42:43 2020 -0700
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Test ability to access unwritten-to mmap data in core file
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gdb/testsuite/ChangeLog:
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PR corefiles/25631
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* gdb.base/corefile.exp (accessing anonymous, unwritten-to mmap data):
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New test.
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* gdb.base/coremaker.c (buf3): New global.
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(mmapdata): Add mmap call which uses MAP_ANONYMOUS and MAP_PRIVATE
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flags.
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diff --git a/gdb/testsuite/gdb.base/corefile.exp b/gdb/testsuite/gdb.base/corefile.exp
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--- a/gdb/testsuite/gdb.base/corefile.exp
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+++ b/gdb/testsuite/gdb.base/corefile.exp
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@@ -175,6 +175,15 @@ gdb_test_multiple "x/8bd buf2" "$test" {
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}
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}
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+# Test ability to read anonymous and, more importantly, unwritten-to
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+# mmap'd data.
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+
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+if { ![istarget *-linux*] } {
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+ setup_xfail "*-*-*"
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+}
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+gdb_test "x/wx buf3" "$hex:\[ \t\]+0x00000000" \
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+ "accessing anonymous, unwritten-to mmap data"
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+
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# test reinit_frame_cache
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gdb_load ${binfile}
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diff --git a/gdb/testsuite/gdb.base/coremaker.c b/gdb/testsuite/gdb.base/coremaker.c
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--- a/gdb/testsuite/gdb.base/coremaker.c
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+++ b/gdb/testsuite/gdb.base/coremaker.c
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@@ -38,6 +38,7 @@
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char *buf1;
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char *buf2;
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+char *buf3;
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int coremaker_data = 1; /* In Data section */
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int coremaker_bss; /* In BSS section */
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@@ -104,6 +105,15 @@ mmapdata ()
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}
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/* Touch buf2 so kernel writes it out into 'core'. */
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buf2[0] = buf1[0];
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+
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+ /* Create yet another region which is allocated, but not written to. */
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+ buf3 = mmap (NULL, MAPSIZE, PROT_READ | PROT_WRITE,
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+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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+ if (buf3 == (char *) -1)
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+ {
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+ perror ("mmap failed");
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+ return;
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+ }
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}
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void
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