linux-kernel - [PATCH v3] KVM: selftests: Initialise dynamically allocated configuration names

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20231113-kvm-get-reg-list-str-init-v3-1-eaf67d660007@kernel.org>
Date:   Mon, 13 Nov 2023 16:49:39 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Haibo Xu <haibo1.xu@...el.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>
Cc:     kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH v3] KVM: selftests: Initialise dynamically allocated
 configuration names

When we dynamically generate a name for a configuration in get-reg-list
we use strcat() to append to a buffer allocated using malloc() but we
never initialise that buffer. Since malloc() offers no guarantees
regarding the contents of the memory it returns this can lead to us
corrupting, and likely overflowing, the buffer:

  vregs: PASS
  vregs+pmu: PASS
  sve: PASS
  sve+pmu: PASS
  vregs+pauth_address+pauth_generic: PASS
  X�vr+gspauth_addre+spauth_generi+pmu: PASS

Initialise the buffer to an empty string to avoid this.

Fixes: 2f9ace5d4557 ("KVM: arm64: selftests: get-reg-list: Introduce vcpu configs")
Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
Changes in v3:
- Rebase this bugfix onto v6.7-rc1
- Link to v2: https://lore.kernel.org/r/20231017-kvm-get-reg-list-str-init-v2-1-ee30b1df3e50@kernel.org

Changes in v2:
- Update Fixes: tag.
- Link to v1: https://lore.kernel.org/r/20231013-kvm-get-reg-list-str-init-v1-1-034f370ff8ab@kernel.org
---
 tools/testing/selftests/kvm/get-reg-list.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/kvm/get-reg-list.c b/tools/testing/selftests/kvm/get-reg-list.c
index be7bf5224434..dd62a6976c0d 100644
--- a/tools/testing/selftests/kvm/get-reg-list.c
+++ b/tools/testing/selftests/kvm/get-reg-list.c
@@ -67,6 +67,7 @@ static const char *config_name(struct vcpu_reg_list *c)
 
 	c->name = malloc(len);
 
+	c->name[0] = '\0';
 	len = 0;
 	for_each_sublist(c, s) {
 		if (!strcmp(s->name, "base"))

---
base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
change-id: 20231012-kvm-get-reg-list-str-init-76c8ed4e19d6

Best regards,
-- 
Mark Brown <broonie@...nel.org>