diff mbox series

[v2] KVM: selftests: Initialise dynamically allocated configuration names

Message ID 20231017-kvm-get-reg-list-str-init-v2-1-ee30b1df3e50@kernel.org
State Superseded
Headers show
Series [v2] KVM: selftests: Initialise dynamically allocated configuration names | expand

Commit Message

Mark Brown Oct. 17, 2023, 5:22 p.m. UTC
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@ventanamicro.com>
Signed-off-by: Mark Brown <broonie@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(+)


---
base-commit: 6465e260f48790807eef06b583b38ca9789b6072
change-id: 20231012-kvm-get-reg-list-str-init-76c8ed4e19d6

Best regards,
diff mbox series

Patch

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"))