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Most of these are harmless, but some of the type confusions and especially
a missing ctf_strerror() on an error path were actual bugs that could
have resulted in test failures crashing rather than printing an error
message.
libctf/
* testsuite/libctf-lookup/enumerator-iteration.c: Fix type
confusion, signedness confusion and a missing ctf_errmsg().
* testsuite/libctf-regression/libctf-repeat-cu-main.c: Return 0 from
the test function.
* testsuite/libctf-regression/open-error-free.c: Fix signedness
confusion.
* testsuite/libctf-regression/zrewrite.c: Remove unused label.
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The libctf-regression/open-error-free.c test works by interposing malloc
and counting mallocs and frees across libctf operations. This only
works under suitably-interposable mallocs on systems supporting
dlsym (RTLD_NEXT, ...), so its operation is restricted to glibc
systems for now, but also it interacts badly with valgrind, which
interposes malloc itself. Detect a running valgrind and skip the test.
Add new facilities allowing libctf lookup tests to declare themselves
unsupported, by printing "UNSUPPORTED: " and then some meaningful
message instead of their normal output.
libctf/
* configure.ac: Check for <valgrind/valgrind.h>.
* config.h.in: Regenerate.
* configure: Likewise.
* testsuite/lib/ctf-lib.exp (run_lookup_test): Add support for
UNSUPPORTED tests.
* testsuite/libctf-regression/open-error-free.c: When running
under valgrind, this test is unsupported.
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* testsuite/libctf-regression/open-error-free.c (main): Correct
format length modifier.
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Ever since commit 1fa7a0c24e78e7f ("libctf: sort out potential refcount
loops") ctf_dict_close has only freed anything if the refcount on entry
to the function is precisely 1. >1 obviously just decrements the
refcount, but the linker machinery can sometimes cause freeing to recurse
from a dict to another dict and then back to the first dict again, so
we interpret a refcount of 0 as an indication that this is a recursive call
and we should just return, because a caller is already freeing this dict.
Unfortunately there is one situation in which this is not true: the bad:
codepath in ctf_bufopen entered when opening fails. Because the refcount is
bumped only at the very end of ctf_bufopen, any failure causes
ctf_dict_close to be entered with a refcount of zero, and it frees nothing
and we leak the entire dict.
The solution is to bump the refcount to 1 right before freeing... but this
codepath is clearly delicate enough that we need to properly validate it,
so we add a test that uses malloc interposition to count allocations and
frees, creates a dict, writes it out, intentionally corrupts it (by setting
a bunch of bytes after the header to a value high enough that it is
definitely not a valid CTF type kind), then tries to open it again and
counts the malloc/free pairs to make sure they're matched. (Test run only
on *-linux-gnu, because malloc interposition is not a thing you can rely
upon working everywhere, and this test is not arch-dependent so if it
passes on one arch it can be assumed to pass on all of them.)
libctf/
* ctf-open.c (ctf_bufopen): Bump the refcount on failure.
* testsuite/libctf-regression/open-error-free.*: New test.
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