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security-context: avoid UB in C macro (#8229)

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to safely use wl_container_of with a class the class has to be no
virtual functions, no inheritance, and uniform access control (e.g all
public)

work around this by putting this into a destroywrapper struct.
This commit is contained in:
Tom Englund
2024-10-25 12:26:48 +02:00
committed by GitHub
parent 3cec45d821
commit f0e023bff2
2 changed files with 17 additions and 7 deletions
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12
src/protocols/SecurityContext.cpp
View File

@@ -22,7 +22,8 @@ SP<CSecurityContextSandboxedClient> CSecurityContextSandboxedClient::create(int
} }
static void onSecurityContextClientDestroy(wl_listener* l, void* d) { static void onSecurityContextClientDestroy(wl_listener* l, void* d) {
CSecurityContextSandboxedClient* client = wl_container_of(l, client, destroyListener); CSecurityContextSandboxedClientDestroyWrapper* wrap = wl_container_of(l, wrap, listener);
CSecurityContextSandboxedClient* client = wrap->parent;
client->onDestroy(); client->onDestroy();
} }
@@ -31,12 +32,15 @@ CSecurityContextSandboxedClient::CSecurityContextSandboxedClient(int clientFD_)
if (!client) if (!client)
return; return;
destroyListener.notify = ::onSecurityContextClientDestroy; wl_list_init(&destroyListener.listener.link);
wl_client_add_destroy_late_listener(client, &destroyListener); destroyListener.listener.notify = ::onSecurityContextClientDestroy;
destroyListener.parent = this;
wl_client_add_destroy_late_listener(client, &destroyListener.listener);
} }
CSecurityContextSandboxedClient::~CSecurityContextSandboxedClient() { CSecurityContextSandboxedClient::~CSecurityContextSandboxedClient() {
wl_list_remove(&destroyListener.link); wl_list_remove(&destroyListener.listener.link);
wl_list_init(&destroyListener.listener.link);
close(clientFD); close(clientFD);
} }

8
src/protocols/SecurityContext.hpp
View File

@@ -37,6 +37,12 @@ class CSecurityContextManagerResource {
SP<CWpSecurityContextManagerV1> resource; SP<CWpSecurityContextManagerV1> resource;
}; };
class CSecurityContextSandboxedClient;
struct CSecurityContextSandboxedClientDestroyWrapper {
wl_listener listener;
CSecurityContextSandboxedClient* parent = nullptr;
};
class CSecurityContextSandboxedClient { class CSecurityContextSandboxedClient {
public: public:
static SP<CSecurityContextSandboxedClient> create(int clientFD); static SP<CSecurityContextSandboxedClient> create(int clientFD);
@@ -44,7 +50,7 @@ class CSecurityContextSandboxedClient {
void onDestroy(); void onDestroy();
wl_listener destroyListener; CSecurityContextSandboxedClientDestroyWrapper destroyListener;
private: private:
CSecurityContextSandboxedClient(int clientFD_); CSecurityContextSandboxedClient(int clientFD_);