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kernel-symbol: delay symbol filtering until lookup

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We don't want to avoid adding the symbols to the index table, or we will
get the wrong addresses.

So instead, add them, and then ignore the symbols upon lookup.
This commit is contained in:
Christian Hergert
2018-01-29 02:09:31 -08:00
parent 8a47f72749
commit 3b3252e050
1 changed files with 21 additions and 17 deletions
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38
lib/symbols/sp-kernel-symbol.c
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@ -28,6 +28,7 @@
static GArray *kernel_symbols;
static GStringChunk *kernel_symbol_strs;
static GHashTable *kernel_symbols_skip_hash;
static const gchar *kernel_symbols_skip[] = {
/* IRQ stack */
"common_interrupt",
@ -77,15 +78,10 @@ sp_kernel_symbol_compare (gconstpointer a,
}
static inline gboolean
is_ignored (GHashTable *skip,
const gchar *name,
guint8 type)
type_is_ignored (guint8 type)
{
/* Only allow symbols in the text (code) section */
if (type != 't' && type != 'T')
return TRUE;
return g_hash_table_contains (skip, name);
return (type != 't' && type != 'T');
}
static gboolean
@ -122,7 +118,7 @@ failure:
}
static gboolean
sp_kernel_symbol_load_from_sysprofd (GHashTable *skip)
sp_kernel_symbol_load_from_sysprofd (void)
{
g_autoptr(GDBusConnection) conn = NULL;
g_autoptr(GVariant) ret = NULL;
@ -134,8 +130,6 @@ sp_kernel_symbol_load_from_sysprofd (GHashTable *skip)
guint64 addr;
guint8 type;
g_assert (skip != NULL);
if (!(conn = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, NULL)))
return FALSE;
@ -171,7 +165,7 @@ sp_kernel_symbol_load_from_sysprofd (GHashTable *skip)
{
SpKernelSymbol sym;
if (is_ignored (skip, name, type))
if (type_is_ignored (type))
continue;
sym.address = addr;
@ -206,6 +200,7 @@ sp_kernel_symbol_load (void)
skip = g_hash_table_new (g_str_hash, g_str_equal);
for (guint i = 0; i < G_N_ELEMENTS (kernel_symbols_skip); i++)
g_hash_table_insert (skip, (gchar *)kernel_symbols_skip[i], NULL);
kernel_symbols_skip_hash = g_steal_pointer (&skip);
kernel_symbol_strs = g_string_chunk_new (4096);
ar = g_array_new (FALSE, TRUE, sizeof (SpKernelSymbol));
@ -217,7 +212,7 @@ sp_kernel_symbol_load (void)
{
SpKernelSymbol sym;
if (is_ignored (skip, name, type))
if (type_is_ignored (type))
continue;
sym.address = addr;
@ -235,7 +230,7 @@ sp_kernel_symbol_load (void)
return TRUE;
query_daemon:
if (sp_kernel_symbol_load_from_sysprofd (skip))
if (sp_kernel_symbol_load_from_sysprofd ())
return TRUE;
g_warning ("Kernel symbols will not be available.");
@ -288,6 +283,7 @@ const SpKernelSymbol *
sp_kernel_symbol_from_address (SpCaptureAddress address)
{
const SpKernelSymbol *first;
const SpKernelSymbol *ret;
if G_UNLIKELY (kernel_symbols == NULL)
{
@ -311,8 +307,16 @@ sp_kernel_symbol_from_address (SpCaptureAddress address)
if (address < first->address)
return NULL;
return sp_kernel_symbol_lookup ((SpKernelSymbol *)(gpointer)kernel_symbols->data,
address,
0,
kernel_symbols->len - 1);
ret = sp_kernel_symbol_lookup ((SpKernelSymbol *)(gpointer)kernel_symbols->data,
address,
0,
kernel_symbols->len - 1);
/* We resolve all symbols, including ignored symbols so that we
* don't give back the wrong function juxtapose an ignored func.
*/
if (ret != NULL && g_hash_table_contains (kernel_symbols_skip_hash, ret->name))
return NULL;
return ret;
}