X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibelogind%2Fsd-bus%2Fbus-kernel.c;h=572a9c6e6404796fdadf552bd85f5589597b4339;hp=556b5eb704268adcadb01deeba67ffd60d385c59;hb=a075bca51a4e1338ca2bd4ae54ef1955cfbebc73;hpb=011da473952eb8c7be67e8238f381fc87d50eb58

diff --git a/src/libelogind/sd-bus/bus-kernel.c b/src/libelogind/sd-bus/bus-kernel.c
index 556b5eb70..572a9c6e6 100644
--- a/src/libelogind/sd-bus/bus-kernel.c
+++ b/src/libelogind/sd-bus/bus-kernel.c
@@ -962,8 +962,16 @@ int bus_kernel_take_fd(sd_bus *b) {
         }
 
         r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
-        if (r < 0)
+        if (r < 0) {
+                if (errno == ENOTTY)
+                        /* If the ioctl is not supported we assume that the
+                         * API version changed in a major incompatible way,
+                         * let's indicate an API incompatibility in this
+                         * case. */
+                        return -ESOCKTNOSUPPORT;
+
                 return -errno;
+        }
 
         if (!b->kdbus_buffer) {
                 b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
@@ -977,7 +985,7 @@ int bus_kernel_take_fd(sd_bus *b) {
         /* The higher 32bit of the bus_flags fields are considered
          * 'incompatible flags'. Refuse them all for now. */
         if (hello->bus_flags > 0xFFFFFFFFULL) {
-                r = -EOPNOTSUPP;
+                r = -ESOCKTNOSUPPORT;
                 goto fail;
         }
 
@@ -1566,7 +1574,6 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) {
         make = alloca0_align(offsetof(struct kdbus_cmd, items) +
                              ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
                              ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
-                             ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
                              ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
                              8);
 
@@ -1585,14 +1592,6 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) {
 
         make->size += ALIGN8(n->size);
 
-        /* The busses we create make no restrictions on what metadata
-         * peers can read from incoming messages. */
-        n = KDBUS_ITEM_NEXT(n);
-        n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
-        n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
-        n->data64[0] = _KDBUS_ATTACH_ANY;
-        make->size += ALIGN8(n->size);
-
         /* Provide all metadata via bus-owner queries */
         n = KDBUS_ITEM_NEXT(n);
         n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
@@ -1611,6 +1610,11 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) {
 
         if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
                 safe_close(fd);
+
+                /* Major API change? then the ioctls got shuffled around. */
+                if (errno == ENOTTY)
+                        return -ESOCKTNOSUPPORT;
+
                 return -errno;
         }
 
@@ -1757,32 +1761,6 @@ int bus_kernel_realize_attach_flags(sd_bus *bus) {
         return 0;
 }
 
-int bus_kernel_fix_attach_mask(void) {
-        _cleanup_free_ char *mask = NULL;
-        uint64_t m = (uint64_t) -1;
-        char buf[2+16+2];
-        int r;
-
-        /* By default we don't want any kdbus metadata fields to be
-         * suppressed, hence we reset the kernel mask for it to
-         * (uint64_t) -1. If the module argument was overwritten by
-         * the kernel cmdline, we leave it as is. */
-
-        r = get_proc_cmdline_key("kdbus.attach_flags_mask=", &mask);
-        if (r < 0)
-                return log_warning_errno(r, "Failed to read kernel command line: %m");
-
-        if (r == 0) {
-                sprintf(buf, "0x%" PRIx64 "\n", m);
-                r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
-                if (r < 0)
-                        return log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r,
-                                              "Failed to write kdbus attach mask: %m");
-        }
-
-        return 0;
-}
-
 int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
         struct kdbus_cmd_info cmd = {
                 .size = sizeof(struct kdbus_cmd_info),