LATX, fix: Scope KZT compatibility fallback by library group

Compatibility checks previously disabled the process-wide KZT option when an application path contained a private guest library matching any wrapped SONAME. This also disabled unrelated library families, while wrapper-selection logs could still describe the configured groups rather than the execution-time result.

Keep the configured mask as the requested state and prune incompatible families only from a separate effective mask. Derive the execution-time KZT predicate from the process-level 0/1/2 mode and the effective mask, then use it consistently for translation, bridge, signal, address-validation, relocation, and callback paths. Configuration, direct-exec, and Wine deferral continue to manage the process-level mode.

Match private guest libraries at the .so boundary and confirm each candidate is an x86_64 ELF. Remove the undocumented GTK3/libXt name gate; retain the existing Chrome process gate as an explicit all-family rejection.

Signed-off-by: Hanlu Li <heuleehanlu@gmail.com>

Author: LaurenIsACoder

accel/tcg/cpu-exec.c

@@ -195,7 +195,7 @@ cpu_tb_exec(CPUState *cpu, TranslationBlock *itb, int *tb_exit)
     if (qemu_loglevel_mask(CPU_LOG_EXEC)) {
 #ifdef CONFIG_LATX_KZT
         Dl_info dl_info;
-        if (option_kzt && itb->pc > reserved_va &&
+        if (latx_kzt_runtime_enabled() && itb->pc > reserved_va &&
             dladdr ((const void *)((onebridge_t *)itb->pc)->f, &dl_info)) {
             qemu_log_mask_and_addr(CPU_LOG_EXEC, itb->pc,
                    "pid(%d) - tid(%" PRIuPTR ") Trace cpu%d: %p [ "
@@ -285,7 +285,7 @@ cpu_tb_exec(CPUState *cpu, TranslationBlock *itb, int *tb_exit)
             }
             lazypc = rettb->pc + rettb->lazypc[0];
 #if defined(CONFIG_LATX_KZT)
-            if (option_kzt && lazypc >= reserved_va) {
+            if (latx_kzt_runtime_enabled() && lazypc >= reserved_va) {
                 uintptr_t alt_pc = (uintptr_t)getAlternate((void *)(uintptr_t)lazypc);
                 if (alt_pc != (uintptr_t)lazypc) {
                     lazypc = alt_pc;
@@ -853,7 +853,7 @@ TranslationBlock * kzt_tb_find_exp(
 static inline bool cpu_handle_exception(CPUState *cpu, int *ret)
 {
 #if defined(CONFIG_LATX_KZT)
-    if (option_kzt) {
+    if (latx_kzt_runtime_enabled()) {
         CPUArchState *env = cpu->env_ptr;
         if(env->eip == (uint64_t)&RunFunctionWithState){
             *ret = 0xCC;
@@ -945,7 +945,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
                                         TranslationBlock **last_tb)
 {
 #if defined(CONFIG_LATX_KZT)
-    if (option_kzt) {
+    if (latx_kzt_runtime_enabled()) {
         CPUArchState *env = cpu->env_ptr;
         if(env->eip == (uint64_t)&RunFunctionWithState){
             *last_tb = NULL;

accel/tcg/tb-flush.c

@@ -106,6 +106,7 @@ void do_tb_flush(CPUState *cpu, run_on_cpu_data tb_flush_count)
     }
 #if defined(CONFIG_LATX_KZT)
     CPU_FOREACH(cpu) {
+        /* The installer also checks the effective library-group mask. */
         if (cpu && option_kzt) {
             kzt_install_runtime_callbacks(cpu, &info1);
         }

accel/tcg/translate-all.c

@@ -3817,7 +3817,7 @@ void *page_alloc_target_data(target_ulong address, size_t size)
 bool page_check_range(target_ulong start, target_ulong len, int flags)
 {
 #if defined(CONFIG_LATX_KZT)
-    if (option_kzt && start > reserved_va) {
+    if (latx_kzt_runtime_enabled() && start > reserved_va) {
         return true;
     }
 #endif

accel/tcg/user-exec.c

@@ -1360,7 +1360,8 @@ int cpu_signal_handler(int host_signum, void *pinfo,
         }
     }
 #if defined(CONFIG_LATX_KZT)
-    if (option_kzt && (int64_t)info->si_addr >= info1.start_data &&
+    if (latx_kzt_runtime_enabled() &&
+        (int64_t)info->si_addr >= info1.start_data &&
         (int64_t)info->si_addr <= info1.end_data &&
         info->si_signo == SIGSEGV) {
         int ret = elf_data_interpret(info, uc);
@@ -1369,7 +1370,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
             return 1;
         }
     }
-    if (option_kzt && info->si_signo == SIGSEGV) {
+    if (latx_kzt_runtime_enabled() && info->si_signo == SIGSEGV) {
         for (int i = 0; i < sizeof(elf_native_func) / sizeof(int); i++) {
             if (!find_stack_func_exist(elf_native_func[i], 4)) {
                 int ret = elf_data_interpret(info, uc);

include/exec/cpu_ldst.h

@@ -58,7 +58,7 @@
 #define CPU_LDST_H
 
 #if defined(CONFIG_LATX_KZT)
-extern int option_kzt;
+#include "kzt-runtime.h"
 #endif
 #if defined(CONFIG_USER_ONLY)
 /* sparc32plus has 64bit long but 32bit space address
@@ -93,7 +93,7 @@ static inline void *g2h(CPUState *cs, abi_ptr x)
 static inline bool guest_addr_valid_untagged(abi_ulong x)
 {
 #if defined(CONFIG_LATX_KZT)
-    if (option_kzt) {
+    if (latx_kzt_runtime_enabled()) {
         return true;
     } else
 #endif
@@ -103,7 +103,7 @@ static inline bool guest_addr_valid_untagged(abi_ulong x)
 static inline bool guest_range_valid_untagged(abi_ulong start, abi_ulong len)
 {
 #if defined(CONFIG_LATX_KZT)
-    if (option_kzt) {
+    if (latx_kzt_runtime_enabled()) {
         return true;
     } else
 #endif

linux-user/i386/cpu_loop.c

@@ -221,7 +221,7 @@ void cpu_loop(CPUX86State *env)
         cpu_exec_end(cs);
         process_queued_cpu_work(cs);
 #if defined(CONFIG_LATX_KZT)
-        if(option_kzt && trapnr == 0xCC)
+        if (latx_kzt_runtime_enabled() && trapnr == 0xCC)
             break;
 #endif
         switch(trapnr) {

linux-user/signal.c

@@ -1308,7 +1308,8 @@ static void host_signal_handler(int host_signum, siginfo_t *info,
     cpu_exit(thread_cpu);
 #if defined(CONFIG_LATX_KZT)
 #define SIGCANCEL       __SIGRTMIN
-    if (host_signum == SIGCANCEL + 2 && option_kzt && pc > reserved_va) {
+    if (host_signum == SIGCANCEL + 2 && latx_kzt_runtime_enabled() &&
+        pc > reserved_va) {
         #define BTSIZT 64
         void    * array[BTSIZT] = {0};
         size_t  size;

target/i386/latx/context/elfloader.c

@@ -653,7 +653,22 @@ static int isChromeApp(elfheader_t* h, int con_score)
     return 0;
 }
 
-int CheckEnableKZT(elfheader_t* h, char** target_argv, int target_argc)
+static bool kzt_soname_matches_filename(const char *soname,
+                                        const char *filename)
+{
+    const char *suffix = strstr(soname, ".so");
+    size_t prefix_length;
+
+    if (!suffix) {
+        return !strcmp(soname, filename);
+    }
+    prefix_length = suffix - soname + strlen(".so");
+    return !strncmp(soname, filename, prefix_length) &&
+           (filename[prefix_length] == '\0' ||
+            filename[prefix_length] == '.');
+}
+
+void CheckEnableKZT(elfheader_t *h, char **target_argv, int target_argc)
 {
     path_collection_t   lib_path = {0,0,0};
     char *rpathref;
@@ -675,11 +690,6 @@ int CheckEnableKZT(elfheader_t* h, char** target_argv, int target_argc)
                 }
                 break;
             case DT_NEEDED:
-                if (strstr(h->DynStrTab+h->delta+h->Dynamic[i].d_un.d_val, "libgtk-3.so")||//skip gtk
-                    strstr(h->DynStrTab+h->delta+h->Dynamic[i].d_un.d_val, "libXt.so")) {//skip mainexec needed libXt.so
-                    printf_log(LOG_INFO, "latx find libgtk or libXt, skip kzt\n");
-                    return 0;
-                }
                 ++needlibcnt;
                 break;
         }
@@ -696,11 +706,6 @@ int CheckEnableKZT(elfheader_t* h, char** target_argv, int target_argc)
         if (!kzt_library_is_enabled(wrappedlibs_name[i])) {
             continue;
         }
-        char *p = box_strdup(wrappedlibs_name[i]);
-        char *p2 = strchr(p, '.');
-        if (++p2) {
-            *p2 = '\0';
-        }
         for (int j=0; j<lib_path.size; ++j) {
             DIR *dir = opendir(lib_path.paths[j]);
             if (dir == NULL) {
@@ -710,26 +715,56 @@ int CheckEnableKZT(elfheader_t* h, char** target_argv, int target_argc)
 
             struct dirent *entry;
             while ((entry = readdir(dir)) != NULL) {
-                if (entry->d_type == DT_REG) {  // Check if it's a regular file
-                    if (!strncmp(entry->d_name, p, strlen(p))) {
-                        printf_log(LOG_INFO, "File starting with '%s' found: %s at %s\n", p, entry->d_name, lib_path.paths[j]);
-                        closedir(dir);
-                        FreeCollection(&lib_path);
-                        return 0;
-                    }
+                char candidate[PATH_MAX];
+                char reason[PATH_MAX + 96];
+                KztLibraryGroup group;
+                int candidate_length;
+
+                if (!kzt_soname_matches_filename(wrappedlibs_name[i],
+                                                 entry->d_name)) {
+                    continue;
                 }
+                candidate_length = snprintf(
+                    candidate, sizeof(candidate), "%s%s%s", lib_path.paths[j],
+                    lib_path.paths[j][strlen(lib_path.paths[j]) - 1] == '/'
+                        ? "" : "/",
+                    entry->d_name);
+                if (candidate_length < 0 ||
+                    (size_t)candidate_length >= sizeof(candidate)) {
+                    continue;
+                }
+                if (!FileExist(candidate, IS_FILE) ||
+                    !FileIsX64ELF(candidate)) {
+                    continue;
+                }
+                group = kzt_group_for_library(wrappedlibs_name[i]);
+                snprintf(reason, sizeof(reason),
+                         "guest %s resolved from application path %s",
+                         entry->d_name, lib_path.paths[j]);
+                kzt_group_disable(group, reason);
+                break;
             }
             closedir(dir);
+            if (!kzt_library_is_enabled(wrappedlibs_name[i])) {
+                break;
+            }
         }
     }
     FreeCollection(&lib_path);
     //disable kzt chrome app
     for(int i = 0; i < target_argc; i++) {
         if (!strcmp(target_argv[i], "--no-sandbox")) {
-            return !isChromeApp(h, 5);
+            if (isChromeApp(h, 5)) {
+                kzt_groups_disable_all(
+                    "main executable matched the Chrome compatibility gate");
+            }
+            return;
         }
     }
-    return !isChromeApp(h, 10);
+    if (isChromeApp(h, 10)) {
+        kzt_groups_disable_all(
+            "main executable matched the Chrome compatibility gate");
+    }
 }
 
 const char* ElfName(elfheader_t* head)

target/i386/latx/context/kzt-groups.c

@@ -39,7 +39,8 @@ static const KztLibraryGroupEntry kzt_library_groups[] = {
 #undef GO
 #undef GOALIAS
 
-static uint32_t enabled_groups = KZT_GROUP_STABLE;
+static uint32_t requested_groups = KZT_GROUP_STABLE;
+uint32_t kzt_effective_groups = KZT_GROUP_STABLE;
 static bool group_log_enabled;
 static char group_error[128];
 static bool library_decision_logged[ARRAY_SIZE(kzt_library_groups)];
@@ -268,7 +269,7 @@ static void kzt_groups_log_effective(const char *spec, uint32_t dependencies,
     if (pruned) {
         kzt_groups_log_mask("disabled dependent library groups", pruned);
     }
-    kzt_groups_log_mask("enabled library groups", enabled_groups);
+    kzt_groups_log_mask("enabled library groups", kzt_effective_groups);
 }
 
 KztLibraryGroup kzt_group_for_library(const char *soname)
@@ -326,7 +327,8 @@ void kzt_groups_print_available(void)
 
 void kzt_groups_reset(void)
 {
-    enabled_groups = KZT_GROUP_STABLE;
+    requested_groups = KZT_GROUP_STABLE;
+    kzt_effective_groups = KZT_GROUP_STABLE;
     group_log_enabled = false;
     group_error[0] = '\0';
     memset(library_decision_logged, 0, sizeof(library_decision_logged));
@@ -349,7 +351,8 @@ bool kzt_groups_configure(const char *spec, bool log_enabled)
     memset(library_decision_logged, 0, sizeof(library_decision_logged));
     if (!kzt_parse_group_spec(spec, &mode, &selected, &added, &removed,
                               &use_stable)) {
-        enabled_groups = KZT_GROUP_NONE;
+        requested_groups = KZT_GROUP_NONE;
+        kzt_effective_groups = KZT_GROUP_NONE;
         group_log_enabled = log_enabled;
         return false;
     }
@@ -367,28 +370,75 @@ bool kzt_groups_configure(const char *spec, bool log_enabled)
     dependencies = groups & ~before_dependencies;
     groups &= ~removed;
     before_prune = groups;
-    enabled_groups = kzt_prune_missing_dependencies(groups);
-    pruned = before_prune & ~enabled_groups;
+    requested_groups = kzt_prune_missing_dependencies(groups);
+    kzt_effective_groups = requested_groups;
+    pruned = before_prune & ~kzt_effective_groups;
     group_log_enabled = log_enabled;
     kzt_groups_log_effective(spec, dependencies, removed, pruned);
     return true;
 }
 
 void kzt_groups_reject_configuration(const char *reason, bool log_enabled)
 {
-    enabled_groups = KZT_GROUP_NONE;
+    requested_groups = KZT_GROUP_NONE;
+    kzt_effective_groups = KZT_GROUP_NONE;
     group_log_enabled = log_enabled;
     snprintf(group_error, sizeof(group_error), "%s", reason);
 }
 
-uint32_t kzt_groups_enabled_mask(void)
+uint32_t kzt_groups_requested_mask(void)
 {
-    return enabled_groups;
+    return requested_groups;
+}
+
+uint32_t kzt_groups_effective_mask(void)
+{
+    return kzt_effective_groups;
+}
+
+bool kzt_group_disable(KztLibraryGroup group, const char *reason)
+{
+    uint32_t before_prune;
+    uint32_t pruned;
+
+    if (group == KZT_GROUP_NONE || !(kzt_effective_groups & group)) {
+        return false;
+    }
+
+    kzt_effective_groups &= ~group;
+    before_prune = kzt_effective_groups;
+    kzt_effective_groups = kzt_prune_missing_dependencies(kzt_effective_groups);
+    pruned = before_prune & ~kzt_effective_groups;
+
+    if (group_log_enabled) {
+        fprintf(stderr, "KZT: disabled library group %s: %s\n",
+                kzt_group_name(group),
+                reason ? reason : "compatibility check failed");
+        if (pruned) {
+            kzt_groups_log_mask("disabled dependent library groups", pruned);
+        }
+        kzt_groups_log_mask("enabled library groups", kzt_effective_groups);
+    }
+    return true;
+}
+
+void kzt_groups_disable_all(const char *reason)
+{
+    if (kzt_effective_groups == KZT_GROUP_NONE) {
+        return;
+    }
+    kzt_effective_groups = KZT_GROUP_NONE;
+    if (group_log_enabled) {
+        fprintf(stderr, "KZT: disabled all library groups: %s\n",
+                reason ? reason : "compatibility check failed");
+        kzt_groups_log_mask("enabled library groups", kzt_effective_groups);
+    }
 }
 
 bool kzt_group_is_enabled(KztLibraryGroup group)
 {
-    return group != KZT_GROUP_NONE && (enabled_groups & group) == group;
+    return group != KZT_GROUP_NONE &&
+           (kzt_effective_groups & group) == group;
 }
 
 bool kzt_library_is_enabled(const char *soname)