From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>,
"Phillip Wood" <phillip.wood123@gmail.com>,
"Jeff King" <peff@peff.net>,
"Derrick Stolee" <derrickstolee@github.com>,
"Elijah Newren" <newren@gmail.com>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: [PATCH v2 00/15] leak fixes: use existing constructors & other trivia
Date: Tue, 8 Nov 2022 19:17:36 +0100 [thread overview]
Message-ID: <cover-v2-00.15-00000000000-20221108T172650Z-avarab@gmail.com> (raw)
In-Reply-To: <cover-00.17-00000000000-20221103T164632Z-avarab@gmail.com>
This is a bag of simple leak fixes, mostly one-line additions where we
use existing destructors. See [1] for v1.
Changes since v1:
* Rebased on pw/rebase-no-reflog-action, per [2].
* It'll merge just fine without pw/rebase-no-reflog-action, but some
of the tests marked as leak-free will still leak then. So, in
practice they can be staged independently, as long as
pw/rebase-no-reflog-action is merged down first.
* The 10/15 here has an updated explanation about why we were leaking
that value. see also[3].
As noted in my [4] some of the rebase/sequencer leaks addressed here
should have a more thorough fix to address the root cause of some of
them, which is also something pw/rebase-no-reflog-action is running
into (and why it's introducing a new leak, while fixing another one).
But per [4] I think the right thing to do is to merge both that topic
& this down first, and then we can follow-up with those fixes (which I
have staged locally already). Getting the extra leak coverage this
series & pw/rebase-no-reflog-action bring us will help in the
meantime.
1. https://lore.kernel.org/git/cover-00.17-00000000000-20221103T164632Z-avarab@gmail.com/
2. https://lore.kernel.org/git/8eec228d-d392-523d-2415-149b946f642e@dunelm.org.uk/
3. https://lore.kernel.org/git/221108.86zgd1qxac.gmgdl@evledraar.gmail.com/
4. https://lore.kernel.org/git/221108.864jv9sc9r.gmgdl@evledraar.gmail.com/
Ævar Arnfjörð Bjarmason (15):
tests: mark tests as passing with SANITIZE=leak
{reset,merge}: call discard_index() before returning
commit: discard partial cache before (re-)reading it
read-cache.c: clear and free "sparse_checkout_patterns"
dir.c: free "ident" and "exclude_per_dir" in "struct untracked_cache"
built-ins & libs & helpers: add/move destructors, fix leaks
unpack-file: fix ancient leak in create_temp_file()
revision API: call graph_clear() in release_revisions()
ls-files: fix a --with-tree memory leak
sequencer.c: fix "opts->strategy" leak in read_strategy_opts()
connected.c: free the "struct packed_git"
rebase: don't leak on "--abort"
cherry-pick: free "struct replay_opts" members
revert: fix parse_options_concat() leak
built-ins: use free() not UNLEAK() if trivial, rm dead code
builtin/add.c | 2 +-
builtin/bugreport.c | 9 +++--
builtin/checkout.c | 2 ++
builtin/commit.c | 13 +++++---
builtin/config.c | 42 +++++++++++-------------
builtin/diff.c | 2 +-
builtin/ls-files.c | 1 +
builtin/merge.c | 1 +
builtin/rebase.c | 4 +++
builtin/repack.c | 2 +-
builtin/reset.c | 2 ++
builtin/rev-parse.c | 1 +
builtin/revert.c | 4 +++
builtin/stash.c | 2 ++
builtin/unpack-file.c | 1 +
builtin/worktree.c | 7 ++--
connected.c | 6 +++-
dir.c | 10 ++++--
dir.h | 1 +
read-cache.c | 5 +++
ref-filter.c | 1 +
revision.c | 1 +
sequencer.c | 1 +
t/helper/test-fake-ssh.c | 1 +
t/t0068-for-each-repo.sh | 1 +
t/t0070-fundamental.sh | 1 +
t/t1011-read-tree-sparse-checkout.sh | 1 +
t/t1022-read-tree-partial-clone.sh | 2 +-
t/t1404-update-ref-errors.sh | 2 ++
t/t1409-avoid-packing-refs.sh | 1 +
t/t1413-reflog-detach.sh | 1 +
t/t1501-work-tree.sh | 2 ++
t/t2012-checkout-last.sh | 1 +
t/t2018-checkout-branch.sh | 1 +
t/t2025-checkout-no-overlay.sh | 1 +
t/t3009-ls-files-others-nonsubmodule.sh | 1 +
t/t3010-ls-files-killed-modified.sh | 2 ++
t/t3050-subprojects-fetch.sh | 1 +
t/t3060-ls-files-with-tree.sh | 2 ++
t/t3409-rebase-environ.sh | 1 +
t/t3413-rebase-hook.sh | 1 +
t/t3428-rebase-signoff.sh | 1 +
t/t3429-rebase-edit-todo.sh | 1 +
t/t3433-rebase-across-mode-change.sh | 1 +
t/t4015-diff-whitespace.sh | 4 +--
t/t4045-diff-relative.sh | 2 ++
t/t4052-stat-output.sh | 1 +
t/t4053-diff-no-index.sh | 1 +
t/t4067-diff-partial-clone.sh | 1 +
t/t4111-apply-subdir.sh | 1 +
t/t4135-apply-weird-filenames.sh | 1 +
t/t4213-log-tabexpand.sh | 1 +
t/t5544-pack-objects-hook.sh | 2 ++
t/t5554-noop-fetch-negotiator.sh | 2 ++
t/t5610-clone-detached.sh | 1 +
t/t5611-clone-config.sh | 1 +
t/t5614-clone-submodules-shallow.sh | 1 +
t/t5617-clone-submodules-remote.sh | 1 +
t/t5618-alternate-refs.sh | 2 ++
t/t6060-merge-index.sh | 2 ++
t/t6301-for-each-ref-errors.sh | 1 +
t/t6401-merge-criss-cross.sh | 2 ++
t/t6406-merge-attr.sh | 1 +
t/t6407-merge-binary.sh | 1 +
t/t6415-merge-dir-to-symlink.sh | 1 +
t/t6435-merge-sparse.sh | 1 +
t/t7103-reset-bare.sh | 2 +-
t/t7504-commit-msg-hook.sh | 1 +
t/t7517-per-repo-email.sh | 1 +
t/t7520-ignored-hook-warning.sh | 1 +
t/t7605-merge-resolve.sh | 1 +
t/t7614-merge-signoff.sh | 1 +
t/t9003-help-autocorrect.sh | 2 ++
t/t9115-git-svn-dcommit-funky-renames.sh | 1 -
t/t9146-git-svn-empty-dirs.sh | 1 -
t/t9148-git-svn-propset.sh | 1 -
t/t9160-git-svn-preserve-empty-dirs.sh | 1 -
77 files changed, 142 insertions(+), 48 deletions(-)
Range-diff against v1:
1: 7fe724599a7 ! 1: 58a02e6bb4e tests: mark tests as passing with SANITIZE=leak
@@ Commit message
66eede4a37c (prepare_repo_settings(): plug leak of config values,
2022-09-08)
+ - t2012-checkout-last.sh, t7504-commit-msg-hook.sh,
+ t91{15,46,60}-git-svn-*.sh: The in-flight "pw/rebase-no-reflog-action"
+ series, upon which this is based:
+ https://lore.kernel.org/git/pull.1405.git.1667575142.gitgitgadget@gmail.com/
+
Let's mark all of these as passing with
"TEST_PASSES_SANITIZE_LEAK=true", to have it regression tested,
including as part of the "linux-leaks" CI job.
@@ t/t1022-read-tree-partial-clone.sh
test_expect_success 'read-tree in partial clone prefetches in one batch' '
+ ## t/t2012-checkout-last.sh ##
+@@ t/t2012-checkout-last.sh: test_description='checkout can switch to last branch and merge base'
+ GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
++TEST_PASSES_SANITIZE_LEAK=true
+ . ./test-lib.sh
+
+ test_expect_success 'setup' '
+
## t/t4015-diff-whitespace.sh ##
@@ t/t4015-diff-whitespace.sh: test_expect_success 'no effect on diff from --color-moved with --word-diff' '
test_cmp expect actual
@@ t/t7103-reset-bare.sh: test_expect_success '"mixed" reset is not allowed in bare
git reset --soft HEAD^ &&
git show --pretty=format:%s >out &&
echo one >expect &&
+
+ ## t/t7504-commit-msg-hook.sh ##
+@@ t/t7504-commit-msg-hook.sh: test_description='commit-msg hook'
+ GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
++TEST_PASSES_SANITIZE_LEAK=true
+ . ./test-lib.sh
+
+ test_expect_success 'with no hook' '
+
+ ## t/t9115-git-svn-dcommit-funky-renames.sh ##
+@@
+
+ test_description='git svn dcommit can commit renames of files with ugly names'
+
+-TEST_FAILS_SANITIZE_LEAK=true
+ . ./lib-git-svn.sh
+
+ test_expect_success 'load repository with strange names' '
+
+ ## t/t9146-git-svn-empty-dirs.sh ##
+@@
+
+ test_description='git svn creates empty directories'
+
+-TEST_FAILS_SANITIZE_LEAK=true
+ . ./lib-git-svn.sh
+
+ test_expect_success 'initialize repo' '
+
+ ## t/t9160-git-svn-preserve-empty-dirs.sh ##
+@@ t/t9160-git-svn-preserve-empty-dirs.sh: This test uses git to clone a Subversion repository that contains empty
+ directories, and checks that corresponding directories are created in the
+ local Git repository with placeholder files.'
+
+-TEST_FAILS_SANITIZE_LEAK=true
+ . ./lib-git-svn.sh
+
+ GIT_REPO=git-svn-repo
2: 819fde89a24 = 2: e9962ad790e {reset,merge}: call discard_index() before returning
3: c1003454939 = 3: 8e76a29cce7 commit: discard partial cache before (re-)reading it
4: 68a390619b9 = 4: 24cefde07f0 read-cache.c: clear and free "sparse_checkout_patterns"
5: 29123e62391 = 5: f4fc08a9bc8 dir.c: free "ident" and "exclude_per_dir" in "struct untracked_cache"
6: 009c41d2e91 ! 6: 698a335b1a3 built-ins & libs & helpers: add/move destructors, fix leaks
@@ builtin/checkout.c: static void die_if_some_operation_in_progress(void)
## builtin/rebase.c ##
@@ builtin/rebase.c: int cmd_rebase(int argc, const char **argv, const char *prefix)
- strbuf_release(&buf);
strbuf_release(&revisions);
+ free(options.reflog_action);
free(options.head_name);
+ strvec_clear(&options.git_am_opts);
free(options.gpg_sign_opt);
@@ t/helper/test-fake-ssh.c: int cmd_main(int argc, const char **argv)
fprintf(f, "%s%s", i > 0 ? " " : "", i > 0 ? argv[i] : "ssh:");
fprintf(f, "\n");
+ ## t/t3409-rebase-environ.sh ##
+@@
+
+ test_description='git rebase interactive environment'
+
++TEST_PASSES_SANITIZE_LEAK=true
+ . ./test-lib.sh
+
+ test_expect_success 'setup' '
+
## t/t3428-rebase-signoff.sh ##
@@ t/t3428-rebase-signoff.sh: test_description='git rebase --signoff
This test runs git rebase --signoff and make sure that it works.
@@ t/t3428-rebase-signoff.sh: test_description='git rebase --signoff
. ./test-lib.sh
# A simple file to commit
+
+ ## t/t3433-rebase-across-mode-change.sh ##
+@@
+
+ test_description='git rebase across mode change'
+
++TEST_PASSES_SANITIZE_LEAK=true
+ . ./test-lib.sh
+
+ test_expect_success 'setup' '
7: 38e7c863dd8 = 7: a2cc6f10d0d unpack-file: fix ancient leak in create_temp_file()
8: 2944aaa3ddc ! 8: 45aa6e24c66 revision API: call graph_clear() in release_revisions()
@@ revision.c: void release_revisions(struct rev_info *revs)
diff_free(&revs->pruning);
reflog_walk_info_release(revs->reflog_info);
+ ## t/t3413-rebase-hook.sh ##
+@@ t/t3413-rebase-hook.sh: test_description='git rebase with its hook(s)'
+ GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
++TEST_PASSES_SANITIZE_LEAK=true
+ . ./test-lib.sh
+
+ test_expect_success setup '
+
## t/t4052-stat-output.sh ##
@@ t/t4052-stat-output.sh: test_description='test --stat output of various commands'
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
9: d592439760e = 9: 46809d9be80 ls-files: fix a --with-tree memory leak
10: 9c70bfa334e ! 10: 243ab74120b sequencer.c: fix "opts->strategy" leak in read_strategy_opts()
@@ Commit message
When "read_strategy_opts()" is called we may have populated the
"opts->strategy" before, so we'll need to free() it to avoid leaking
- memory. Along with the preceding commit this change various
- rebase-related tests pass.
+ memory.
+
+ We populate it before because we cal get_replay_opts() from within
+ "rebase.c" with an already populated "opts", which we then copy. Then
+ if we're doing a "rebase -i" the sequencer API itself will promptly
+ clobber our alloc'd version of it with its own.
+
+ If this code is changed to do, instead of the added free() here a:
+
+ if (opts->strategy)
+ opts->strategy = xstrdup("another leak");
+
+ We get a couple of stacktraces from -fsanitize=leak showing how we
+ ended up clobbering the already allocated value, i.e.:
+
+ Direct leak of 6 byte(s) in 1 object(s) allocated from:
+ #0 0x7f2e8cd45545 in __interceptor_malloc ../../../../src/libsanitizer/lsan/lsan_interceptors.cpp:75
+ #1 0x7f2e8cb0fcaa in __GI___strdup string/strdup.c:42
+ #2 0x6c4778 in xstrdup wrapper.c:39
+ #3 0x66bcb8 in read_strategy_opts sequencer.c:2902
+ #4 0x66bf7b in read_populate_opts sequencer.c:2969
+ #5 0x6723f9 in sequencer_continue sequencer.c:5063
+ #6 0x4a4f74 in run_sequencer_rebase builtin/rebase.c:348
+ #7 0x4a64c8 in run_specific_rebase builtin/rebase.c:753
+ #8 0x4a9b8b in cmd_rebase builtin/rebase.c:1824
+ #9 0x407a32 in run_builtin git.c:466
+ #10 0x407e0a in handle_builtin git.c:721
+ #11 0x40803d in run_argv git.c:788
+ #12 0x40850f in cmd_main git.c:923
+ #13 0x4eee79 in main common-main.c:57
+ #14 0x7f2e8ca9f209 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
+ #15 0x7f2e8ca9f2bb in __libc_start_main_impl ../csu/libc-start.c:389
+ #16 0x405fd0 in _start (git+0x405fd0)
+
+ Direct leak of 4 byte(s) in 1 object(s) allocated from:
+ #0 0x7f2e8cd45545 in __interceptor_malloc ../../../../src/libsanitizer/lsan/lsan_interceptors.cpp:75
+ #1 0x7f2e8cb0fcaa in __GI___strdup string/strdup.c:42
+ #2 0x6c4778 in xstrdup wrapper.c:39
+ #3 0x4a3c31 in xstrdup_or_null git-compat-util.h:1169
+ #4 0x4a447a in get_replay_opts builtin/rebase.c:163
+ #5 0x4a4f5b in run_sequencer_rebase builtin/rebase.c:346
+ #6 0x4a64c8 in run_specific_rebase builtin/rebase.c:753
+ #7 0x4a9b8b in cmd_rebase builtin/rebase.c:1824
+ #8 0x407a32 in run_builtin git.c:466
+ #9 0x407e0a in handle_builtin git.c:721
+ #10 0x40803d in run_argv git.c:788
+ #11 0x40850f in cmd_main git.c:923
+ #12 0x4eee79 in main common-main.c:57
+ #13 0x7f2e8ca9f209 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
+ #14 0x7f2e8ca9f2bb in __libc_start_main_impl ../csu/libc-start.c:389
+ #15 0x405fd0 in _start (git+0x405fd0)
+
+ This can be seen in e.g. the 4th test of
+ "t3404-rebase-interactive.sh".
+
+ In the larger picture the ownership of the "struct replay_opts" is
+ quite a mess, e.g. in this case rebase.c's static "get_replay_opts()"
+ function partially creates it, but nothing in rebase.c will free()
+ it. The structure is "mostly owned" by the sequencer API, but it also
+ expects to get these partially populated versions of it.
+
+ It would be better to have rebase keep track of what it allocated, and
+ free() that, and to pass that as a "const" to the sequencer API, which
+ would copy what it needs to its own version, and to free() that.
+
+ But doing so is a much larger change, and however messy the ownership
+ boundary is here is consistent with what we're doing already, so let's
+ just free() this to fix the leak.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
11: c7722f68ae2 = 11: 15f0837697d connected.c: free the "struct packed_git"
12: 7429151b5c4 < -: ----------- sequencer.c: fix a pick_commits() leak
13: fda9914b558 = 12: f6d76250174 rebase: don't leak on "--abort"
14: 02e1dddf149 < -: ----------- sequencer.c: fix sequencer_continue() leak
15: c9f51abf0e2 = 13: 10a477c7730 cherry-pick: free "struct replay_opts" members
16: f7d39020a7c = 14: 614c8fc1aef revert: fix parse_options_concat() leak
17: 33a5753cc3a = 15: f3e6a030394 built-ins: use free() not UNLEAK() if trivial, rm dead code
--
2.38.0.1467.g709fbdff1a9
next prev parent reply other threads:[~2022-11-08 18:18 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-03 17:05 [PATCH 00/17] leak fixes: use existing constructors & other trivia Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 01/17] tests: mark tests as passing with SANITIZE=leak Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 02/17] {reset,merge}: call discard_index() before returning Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 03/17] commit: discard partial cache before (re-)reading it Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 04/17] read-cache.c: clear and free "sparse_checkout_patterns" Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 05/17] dir.c: free "ident" and "exclude_per_dir" in "struct untracked_cache" Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 06/17] built-ins & libs & helpers: add/move destructors, fix leaks Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 07/17] unpack-file: fix ancient leak in create_temp_file() Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 08/17] revision API: call graph_clear() in release_revisions() Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 09/17] ls-files: fix a --with-tree memory leak Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 10/17] sequencer.c: fix "opts->strategy" leak in read_strategy_opts() Ævar Arnfjörð Bjarmason
2022-11-04 14:50 ` Phillip Wood
2022-11-04 21:44 ` Taylor Blau
2022-11-05 12:43 ` Ævar Arnfjörð Bjarmason
2022-11-08 15:00 ` Phillip Wood
2022-11-08 15:26 ` Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 11/17] connected.c: free the "struct packed_git" Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 12/17] sequencer.c: fix a pick_commits() leak Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 13/17] rebase: don't leak on "--abort" Ævar Arnfjörð Bjarmason
2022-11-04 14:42 ` Phillip Wood
2022-11-05 12:01 ` Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 14/17] sequencer.c: fix sequencer_continue() leak Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 15/17] cherry-pick: free "struct replay_opts" members Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 16/17] revert: fix parse_options_concat() leak Ævar Arnfjörð Bjarmason
2022-11-03 17:06 ` [PATCH 17/17] built-ins: use free() not UNLEAK() if trivial, rm dead code Ævar Arnfjörð Bjarmason
2022-11-04 15:20 ` [PATCH 00/17] leak fixes: use existing constructors & other trivia Phillip Wood
2022-11-05 12:46 ` Ævar Arnfjörð Bjarmason
2022-11-07 9:46 ` Phillip Wood
2022-11-08 18:17 ` Ævar Arnfjörð Bjarmason [this message]
2022-11-08 18:17 ` [PATCH v2 01/15] tests: mark tests as passing with SANITIZE=leak Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 02/15] {reset,merge}: call discard_index() before returning Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 03/15] commit: discard partial cache before (re-)reading it Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 04/15] read-cache.c: clear and free "sparse_checkout_patterns" Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 05/15] dir.c: free "ident" and "exclude_per_dir" in "struct untracked_cache" Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 06/15] built-ins & libs & helpers: add/move destructors, fix leaks Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 07/15] unpack-file: fix ancient leak in create_temp_file() Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 08/15] revision API: call graph_clear() in release_revisions() Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 09/15] ls-files: fix a --with-tree memory leak Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 10/15] sequencer.c: fix "opts->strategy" leak in read_strategy_opts() Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 11/15] connected.c: free the "struct packed_git" Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 12/15] rebase: don't leak on "--abort" Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 13/15] cherry-pick: free "struct replay_opts" members Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 14/15] revert: fix parse_options_concat() leak Ævar Arnfjörð Bjarmason
2022-11-08 18:17 ` [PATCH v2 15/15] built-ins: use free() not UNLEAK() if trivial, rm dead code Ævar Arnfjörð Bjarmason
2022-11-08 20:54 ` [PATCH v2 00/15] leak fixes: use existing constructors & other trivia Taylor Blau
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