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Resolves: RHEL-16549, systemtap uprobe partial registration failure can cause crashes

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Frank Ch. Eigler 2023-11-14 17:51:38 -05:00
parent 7e30728b5f
commit 2a2af534e3
2 changed files with 69 additions and 1 deletions
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59
RHEL-16549.patch Normal file
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@ -0,0 +1,59 @@
commit 0fef0bd60ff4b359a32da52262855dfe82fe51ae
gpg: Signature made Tue 14 Nov 2023 03:20:12 PM EST
gpg: using RSA key 4B35DCD2EA45C4E0783135BC8094BE9C9F4696A1
gpg: Can't check signature: No public key
Author: Yichun Zhang (agentzh) <yichun@openresty.com>
Date: Fri Nov 10 21:51:56 2023 -0800
PR31051: memory and uprobe leaks in early uprobe registraton code when errors happen
diff --git a/runtime/linux/uprobes-inode.c b/runtime/linux/uprobes-inode.c
index 997f4528d..289cce00b 100644
--- a/runtime/linux/uprobes-inode.c
+++ b/runtime/linux/uprobes-inode.c
@@ -529,6 +529,16 @@ stapiu_init(struct stapiu_consumer *consumers, size_t nconsumers)
}
if (unlikely(ret != 0)) {
+ for ( ;; ) {
+ struct stapiu_consumer *c = &consumers[i];
+ // protect against conceivable stapiu_refresh() at same time
+ mutex_lock(& c->consumer_lock);
+ stapiu_consumer_unreg(c);
+ mutex_unlock(& c->consumer_lock);
+ if (i == 0)
+ break;
+ i--;
+ }
return ret;
}
@@ -545,7 +555,27 @@ stapiu_init(struct stapiu_consumer *consumers, size_t nconsumers)
break;
}
}
- return ret;
+
+ if (unlikely(ret != 0)) {
+ int j;
+ for (j = 0; j < nconsumers; ++j) {
+ struct stapiu_consumer *c = &consumers[j];
+ // protect against conceivable stapiu_refresh() at same time
+ mutex_lock(& c->consumer_lock);
+ stapiu_consumer_unreg(c);
+ mutex_unlock(& c->consumer_lock);
+ }
+ for ( ;; ) {
+ struct stapiu_consumer *c = &consumers[i];
+ stap_cleanup_task_finder_target(&c->finder);
+ if (i == 0)
+ break;
+ i--;
+ }
+ return ret;
+ }
+
+ return 0;
}

11
systemtap.spec
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@ -116,7 +116,7 @@ m stapdev stapdev
Name: systemtap
# PRERELEASE
Version: 5.0
Release: 1%{?release_override}%{?dist}
Release: 3%{?release_override}%{?dist}
# for version, see also configure.ac
@ -153,6 +153,8 @@ License: GPL-2.0-or-later
URL: http://sourceware.org/systemtap/
Source: ftp://sourceware.org/pub/systemtap/releases/systemtap-%{version}.tar.gz
Patch1: RHEL-16549.patch
# Build*
BuildRequires: make
BuildRequires: gcc-c++
@ -579,6 +581,7 @@ or within a container.
%prep
%setup -q
%patch -P1 -p1
%build
@ -1298,6 +1301,12 @@ exit 0
# PRERELEASE
%changelog
* Tue Nov 14 2023 Frank Ch. Eigler <fche@redhat.com> - 5.0-3
- RHEL-16549
* Mon Nov 06 2023 Frank Ch. Eigler <fche@redhat.com> - 5.0-2
- License header tweak
* Sat Nov 04 2023 Frank Ch. Eigler <fche@redhat.com> - 5.0-1
- Upstream release, see wiki page below for detailed notes.
https://sourceware.org/systemtap/wiki/SystemTapReleases