|
 |
978e96 |
commit c259196b5005812aa3294dbf4eeca29b266a4522
|
|
|
978e96 |
Author: Florian Weimer <fweimer@redhat.com>
|
|
|
978e96 |
Date: Fri Mar 1 18:53:03 2019 +0100
|
|
|
978e96 |
|
|
|
978e96 |
elf/tst-big-note: Improve accuracy of test [BZ #20419]
|
|
|
978e96 |
|
|
|
978e96 |
It is possible that the link editor injects an allocated ABI tag note
|
|
|
978e96 |
before the artificial, allocated large note in the test. Note parsing
|
|
|
978e96 |
in open_verify stops when the first ABI tag note is encountered, so if
|
|
|
978e96 |
the ABI tag note comes first, the problematic code is not actually
|
|
|
978e96 |
exercised.
|
|
|
978e96 |
|
|
|
978e96 |
Also tweak the artificial note so that it is a syntactically valid
|
|
|
978e96 |
4-byte aligned note, in case the link editor tries to parse notes and
|
|
|
978e96 |
process them.
|
|
|
978e96 |
|
|
|
978e96 |
Improves the testing part of commit 0065aaaaae51cd60210ec3a7e13.
|
|
|
978e96 |
|
|
|
978e96 |
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
|
|
|
978e96 |
|
|
|
978e96 |
(Minor adjustment for Makefile conflict.)
|
|
|
978e96 |
|
|
|
978e96 |
diff --git a/elf/Makefile b/elf/Makefile
|
|
|
978e96 |
index b46b3a0e3542a06f..2b2662d5cf96c437 100644
|
|
|
978e96 |
--- a/elf/Makefile
|
|
|
978e96 |
+++ b/elf/Makefile
|
|
|
978e96 |
@@ -244,8 +244,8 @@ extra-test-objs += $(addsuffix .os,$(strip $(modules-names)))
|
|
|
978e96 |
# We need this variable to be sure the test modules get the right CPPFLAGS.
|
|
|
978e96 |
test-extras += $(modules-names)
|
|
|
978e96 |
|
|
|
978e96 |
-# filtmod1.so has a special rule
|
|
|
978e96 |
-modules-names-nobuild := filtmod1
|
|
|
978e96 |
+# filtmod1.so, tst-big-note-lib.so have special rules.
|
|
|
978e96 |
+modules-names-nobuild := filtmod1 tst-big-note-lib
|
|
|
978e96 |
|
|
|
978e96 |
ifneq (no,$(multi-arch))
|
|
|
978e96 |
tests-static += ifuncmain1static ifuncmain1picstatic \
|
|
|
978e96 |
@@ -1239,3 +1239,8 @@ $(objpfx)tst-audit12mod1.so: $(objpfx)tst-audit12mod2.so
|
|
|
978e96 |
LDFLAGS-tst-audit12mod2.so = -Wl,--version-script=tst-audit12mod2.map
|
|
|
978e96 |
|
|
|
978e96 |
$(objpfx)tst-big-note: $(objpfx)tst-big-note-lib.so
|
|
|
978e96 |
+# Avoid creating an ABI tag note, which may come before the
|
|
|
978e96 |
+# artificial, large note in tst-big-note-lib.o and invalidate the
|
|
|
978e96 |
+# test.
|
|
|
978e96 |
+$(objpfx)tst-big-note-lib.so: $(objpfx)tst-big-note-lib.o
|
|
|
978e96 |
+ $(LINK.o) -shared -o $@ $(LDFLAGS.so) $<
|
|
|
978e96 |
diff --git a/elf/tst-big-note-lib.S b/elf/tst-big-note-lib.S
|
|
|
978e96 |
index 6b514a03cc686141..c97590ccb05e9b2e 100644
|
|
|
978e96 |
--- a/elf/tst-big-note-lib.S
|
|
|
978e96 |
+++ b/elf/tst-big-note-lib.S
|
|
|
978e96 |
@@ -20,7 +20,13 @@
|
|
|
978e96 |
On a typical Linux system with 8MiB "ulimit -s", that was enough
|
|
|
978e96 |
to trigger stack overflow in open_verify. */
|
|
|
978e96 |
|
|
|
978e96 |
+#define NOTE_SIZE 8*1024*1024
|
|
|
978e96 |
+
|
|
|
978e96 |
.pushsection .note.big,"a"
|
|
|
978e96 |
-.balign 4
|
|
|
978e96 |
-.fill 8*1024*1024, 1, 0
|
|
|
978e96 |
+ .balign 4
|
|
|
978e96 |
+ .long 5 /* n_namesz. Length of "GLIBC". */
|
|
|
978e96 |
+ .long NOTE_SIZE /* n_descsz. */
|
|
|
978e96 |
+ .long 0 /* n_type. */
|
|
|
978e96 |
+ .ascii "GLIBC\0\0\0" /* Name and alignment to four bytes. */
|
|
|
978e96 |
+ .fill NOTE_SIZE, 1, 0
|
|
|
978e96 |
.popsection
|