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https://github.com/varun-r-mallya/sysprof.git
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lib: query /proc/kallsyms and/or daemon for symbols
If we have a system where we can read kallsyms without elevated privilledges do that. Otherwise, query the sysprod daemon to get the available kernel symbols.
This commit is contained in:
Christian Hergert
@ -16,10 +16,18 @@
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define G_LOG_DOMAIN "sp-kernel-symbol"
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#include <gio/gio.h>
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#include <polkit/polkit.h>
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#include "sp-kallsyms.h"
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#include "util/sp-line-reader.h"
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#include "symbols/sp-kernel-symbol.h"
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static GArray *kernel_symbols;
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static GStringChunk *kernel_symbol_strs;
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static const gchar *kernel_symbols_skip[] = {
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/* IRQ stack */
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"common_interrupt",
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@ -51,8 +59,6 @@ static const gchar *kernel_symbols_skip[] = {
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"__perf_event_overflow",
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"perf_prepare_sample",
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"perf_callchain",
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NULL
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};
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static gint
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@ -71,73 +77,151 @@ sp_kernel_symbol_compare (gconstpointer a,
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}
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static gboolean
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sp_kernel_symbol_load (void)
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authorize_proxy (GDBusConnection *conn)
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{
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g_autofree gchar *contents = NULL;
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PolkitSubject *subject = NULL;
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GPermission *permission = NULL;
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const gchar *name;
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g_assert (G_IS_DBUS_CONNECTION (conn));
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name = g_dbus_connection_get_unique_name (conn);
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if (name == NULL)
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goto failure;
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subject = polkit_system_bus_name_new (name);
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if (subject == NULL)
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goto failure;
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permission = polkit_permission_new_sync ("org.gnome.sysprof2.get-kernel-symbols", subject, NULL, NULL);
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if (permission == NULL)
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goto failure;
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if (!g_permission_acquire (permission, NULL, NULL))
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goto failure;
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return TRUE;
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failure:
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g_clear_object (&subject);
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g_clear_object (&permission);
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return FALSE;
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}
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static gboolean
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sp_kernel_symbol_load_from_sysprofd (GHashTable *skip)
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{
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g_autoptr(GDBusConnection) conn = NULL;
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g_autoptr(GVariant) ret = NULL;
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g_autoptr(GArray) ar = NULL;
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g_autoptr(GHashTable) skip = NULL;
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g_autoptr(SpLineReader) reader = NULL;
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const gchar *line;
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gsize len;
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guint i;
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g_autoptr(GError) error = NULL;
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GVariantIter iter;
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const gchar *name;
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guint64 addr;
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guint8 type;
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skip = g_hash_table_new (g_str_hash, g_str_equal);
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for (i = 0; kernel_symbols_skip [i]; i++)
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g_hash_table_insert (skip, (gchar *)kernel_symbols_skip [i], NULL);
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g_assert (skip != NULL);
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ar = g_array_new (FALSE, TRUE, sizeof (SpKernelSymbol));
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if (!(conn = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, NULL)))
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return FALSE;
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if (!g_file_get_contents ("/proc/kallsyms", &contents, &len, NULL))
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if (!authorize_proxy (conn))
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{
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g_warning ("/proc/kallsyms is missing, kernel symbols will not be available");
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g_warning ("Failed to acquire sufficient credentials to read kernel symbols");
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return FALSE;
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}
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reader = sp_line_reader_new (contents, len);
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ret = g_dbus_connection_call_sync (conn,
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"org.gnome.Sysprof2",
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"/org/gnome/Sysprof2",
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"org.gnome.Sysprof2",
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"GetKernelSymbols",
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NULL,
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G_VARIANT_TYPE ("a(tys)"),
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G_DBUS_CALL_FLAGS_NONE,
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-1,
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NULL,
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&error);
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while (NULL != (line = sp_line_reader_next (reader, &len)))
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if (error != NULL)
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{
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gchar **tokens;
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((gchar *)line) [len] = '\0';
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tokens = g_strsplit_set (line, " \t", -1);
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if (tokens [0] && tokens [1] && tokens [2])
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{
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SpCaptureAddress address;
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gchar *endptr;
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if (g_hash_table_contains (skip, tokens [2]))
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continue;
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address = g_ascii_strtoull (tokens [0], &endptr, 16);
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if (*endptr == '\0' &&
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(g_str_equal (tokens [1], "T") || g_str_equal (tokens [1], "t")))
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{
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SpKernelSymbol sym;
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sym.address = address;
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sym.name = g_steal_pointer (&tokens [2]);
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g_array_append_val (ar, sym);
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}
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}
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g_strfreev (tokens);
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g_warning ("Failed to load symbols from sysprofd: %s", error->message);
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return FALSE;
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}
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if (ar->len == 0)
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return FALSE;
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ar = g_array_new (FALSE, TRUE, sizeof (SpKernelSymbol));
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g_variant_iter_init (&iter, ret);
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while (g_variant_iter_loop (&iter, "(ty&s)", &addr, &type, &name))
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{
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SpKernelSymbol sym;
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if (g_hash_table_contains (skip, name))
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continue;
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sym.address = addr;
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sym.name = g_string_chunk_insert_const (kernel_symbol_strs, name);
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g_array_append_val (ar, sym);
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}
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g_array_sort (ar, sp_kernel_symbol_compare);
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kernel_symbols = g_steal_pointer (&ar);
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return TRUE;
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}
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static gboolean
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sp_kernel_symbol_load (void)
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{
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g_autoptr(GHashTable) skip = NULL;
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g_autoptr(SpKallsyms) kallsyms = NULL;
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g_autoptr(GArray) ar = NULL;
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const gchar *name;
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guint64 addr;
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guint8 type;
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skip = g_hash_table_new (g_str_hash, g_str_equal);
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for (guint i = 0; i < G_N_ELEMENTS (kernel_symbols_skip); i++)
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g_hash_table_insert (skip, (gchar *)kernel_symbols_skip[i], NULL);
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kernel_symbol_strs = g_string_chunk_new (4096);
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ar = g_array_new (FALSE, TRUE, sizeof (SpKernelSymbol));
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if (!(kallsyms = sp_kallsyms_new ()))
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goto query_daemon;
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while (sp_kallsyms_next (kallsyms, &name, &addr, &type))
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{
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SpKernelSymbol sym;
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if (g_hash_table_contains (skip, name))
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continue;
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sym.address = addr;
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sym.name = g_string_chunk_insert_const (kernel_symbol_strs, name);
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g_array_append_val (ar, sym);
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}
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if (ar->len == 0)
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goto query_daemon;
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g_array_sort (ar, sp_kernel_symbol_compare);
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kernel_symbols = g_steal_pointer (&ar);
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return TRUE;
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query_daemon:
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if (sp_kernel_symbol_load_from_sysprofd (skip))
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return TRUE;
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g_warning ("Kernel symbols will not be available.");
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return FALSE;
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}
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static const SpKernelSymbol *
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sp_kernel_symbol_lookup (SpKernelSymbol *symbols,
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SpCaptureAddress address,
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@ -193,7 +277,6 @@ sp_kernel_symbol_from_address (SpCaptureAddress address)
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if (!sp_kernel_symbol_load ())
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{
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g_warning ("Failed to load kernel symbol map, kernel symbols will not be available!");
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failed = TRUE;
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return NULL;
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}
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