gdb/SOURCES/gdb-rhbz1842691-corefile-mem-access-9of15.patch

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2021-03-30 18:17:43 +00:00
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Keith Seitz <keiths@redhat.com>
Date: Mon, 27 Jul 2020 19:21:54 -0400
Subject: gdb-rhbz1842691-corefile-mem-access-9of15.patch
;; Add test for accessing read-only mmapped data in a core file
;; Kevin Buettner, RH BZ 1842691
Author: Kevin Buettner <kevinb@redhat.com>
Date: Tue Jun 16 11:39:22 2020 -0700
Add test for accessing read-only mmapped data in a core file
This test passes when run using a GDB with my corefile patches. When
run against a GDB without my patches, I see the following failures,
the first of which is due to the test added by this commit:
FAIL: gdb.base/corefile.exp: accessing read-only mmapped data in core file (
FAIL: gdb.base/corefile.exp: accessing anonymous, unwritten-to mmap data
gdb/testsuite/ChangeLog:
* gdb.base/corefile.exp: Add test "accessing read-only mmapped
data in core file".
* gdb.base/coremaker.c (buf2ro): New global.
(mmapdata): Add a read-only mmap mapping.
diff --git a/gdb/testsuite/gdb.base/corefile.exp b/gdb/testsuite/gdb.base/corefile.exp
--- a/gdb/testsuite/gdb.base/corefile.exp
+++ b/gdb/testsuite/gdb.base/corefile.exp
@@ -34,7 +34,10 @@ if {[build_executable $testfile.exp $testfile $srcfile debug] == -1} {
return -1
}
-set corefile [core_find $binfile {coremmap.data}]
+# Do not delete coremap.data when calling core_find. This file is
+# required for GDB to find mmap'd data in the "accessing read-only
+# mmapped data in core file" test.
+set corefile [core_find $binfile {}]
if {$corefile == ""} {
return 0
}
@@ -175,6 +178,19 @@ gdb_test_multiple "x/8bd buf2" "$test" {
}
}
+set test "accessing read-only mmapped data in core file"
+gdb_test_multiple "x/8bd buf2ro" "$test" {
+ -re ".*:.*0.*1.*2.*3.*4.*5.*6.*7.*$gdb_prompt $" {
+ pass "$test"
+ }
+ -re "0x\[f\]*:.*Cannot access memory at address 0x\[f\]*.*$gdb_prompt $" {
+ fail "$test (mapping failed at runtime)"
+ }
+ -re "0x.*:.*Cannot access memory at address 0x.*$gdb_prompt $" {
+ fail "$test (mapping address not found in core file)"
+ }
+}
+
# Test ability to read anonymous and, more importantly, unwritten-to
# mmap'd data.
diff --git a/gdb/testsuite/gdb.base/coremaker.c b/gdb/testsuite/gdb.base/coremaker.c
--- a/gdb/testsuite/gdb.base/coremaker.c
+++ b/gdb/testsuite/gdb.base/coremaker.c
@@ -38,6 +38,7 @@
char *buf1;
char *buf2;
+char *buf2ro;
char *buf3;
int coremaker_data = 1; /* In Data section */
@@ -90,16 +91,25 @@ mmapdata ()
return;
}
+ /* Map in another copy, read-only. We won't write to this copy so it
+ will likely not end up in the core file. */
+ buf2ro = (char *) mmap (0, MAPSIZE, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (buf2ro == (char *) -1)
+ {
+ perror ("mmap failed");
+ return;
+ }
+
/* Verify that the original data and the mapped data are identical.
If not, we'd rather fail now than when trying to access the mapped
data from the core file. */
for (j = 0; j < MAPSIZE; ++j)
{
- if (buf1[j] != buf2[j])
+ if (buf1[j] != buf2[j] || buf1[j] != buf2ro[j])
{
fprintf (stderr, "mapped data is incorrect");
- buf2 = (char *) -1;
+ buf2 = buf2ro = (char *) -1;
return;
}
}