X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=lttng-syscalls.c;h=4eae6747f692c1149adbb5d52fef45a5b8e19ea0;hb=f4855b46cb97a7ad649e97232719c50ab8688119;hp=5023c2f9dcc2ff8c588ad159303255dabab92ac6;hpb=cb3ef14c052adc12da2b9e26aebf9fc6e7d82fa3;p=lttng-modules.git

diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index 5023c2f9..4eae6747 100644
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -27,9 +27,11 @@
 #include <linux/bitmap.h>
 #include <linux/in.h>
 #include <linux/in6.h>
+#include <linux/seq_file.h>
 #include <asm/ptrace.h>
 #include <asm/syscall.h>
 
+#include "lib/bitfield.h"
 #include "wrapper/tracepoint.h"
 #include "lttng-events.h"
 
@@ -949,6 +951,12 @@ int get_compat_syscall_nr(const char *syscall_name)
 	return syscall_nr;
 }
 
+static
+uint32_t get_sc_tables_len(void)
+{
+	return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table);
+}
+
 int lttng_syscall_filter_enable(struct lttng_channel *chan,
 		const char *name)
 {
@@ -1033,6 +1041,12 @@ int lttng_syscall_filter_disable(struct lttng_channel *chan,
 		filter = chan->sc_filter;
 	}
 
+	if (!name) {
+		/* Disable all system calls */
+		bitmap_clear(filter->sc, 0, NR_syscalls);
+		bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);
+		goto apply_filter;
+	}
 	syscall_nr = get_syscall_nr(name);
 	compat_syscall_nr = get_compat_syscall_nr(name);
 	if (syscall_nr < 0 && compat_syscall_nr < 0) {
@@ -1053,6 +1067,7 @@ int lttng_syscall_filter_disable(struct lttng_channel *chan,
 		}
 		bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1);
 	}
+apply_filter:
 	if (!chan->sc_filter)
 		rcu_assign_pointer(chan->sc_filter, filter);
 	chan->syscall_all = 0;
@@ -1063,3 +1078,145 @@ error:
 		kfree(filter);
 	return ret;
 }
+
+static
+const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos)
+{
+	const struct trace_syscall_entry *entry;
+	int iter = 0;
+
+	for (entry = sc_table;
+			entry < sc_table + ARRAY_SIZE(sc_table);
+			 entry++) {
+		if (iter++ >= *pos)
+			return entry;
+	}
+	for (entry = compat_sc_table;
+			entry < compat_sc_table + ARRAY_SIZE(compat_sc_table);
+			 entry++) {
+		if (iter++ >= *pos)
+			return entry;
+	}
+	/* End of list */
+	return NULL;
+}
+
+static
+void *syscall_list_start(struct seq_file *m, loff_t *pos)
+{
+	return (void *) syscall_list_get_entry(pos);
+}
+
+static
+void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos)
+{
+	(*ppos)++;
+	return (void *) syscall_list_get_entry(ppos);
+}
+
+static
+void syscall_list_stop(struct seq_file *m, void *p)
+{
+}
+
+static
+int get_sc_table(const struct trace_syscall_entry *entry,
+		const struct trace_syscall_entry **table,
+		unsigned int *bitness)
+{
+	if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) {
+		if (bitness)
+			*bitness = BITS_PER_LONG;
+		if (table)
+			*table = sc_table;
+		return 0;
+	}
+	if (!(entry >= compat_sc_table
+			&& entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) {
+		return -EINVAL;
+	}
+	if (bitness)
+		*bitness = 32;
+	if (table)
+		*table = compat_sc_table;
+	return 0;
+}
+
+static
+int syscall_list_show(struct seq_file *m, void *p)
+{
+	const struct trace_syscall_entry *table, *entry = p;
+	unsigned int bitness;
+	int ret;
+
+	ret = get_sc_table(entry, &table, &bitness);
+	if (ret)
+		return ret;
+	if (!entry->desc)
+		return 0;
+	seq_printf(m,	"syscall { index = %lu; name = %s; bitness = %u; };\n",
+		table == sc_table ? entry - table :
+			(entry - table) + ARRAY_SIZE(sc_table),
+		entry->desc->name,
+		bitness);
+	return 0;
+}
+
+static
+const struct seq_operations lttng_syscall_list_seq_ops = {
+	.start = syscall_list_start,
+	.next = syscall_list_next,
+	.stop = syscall_list_stop,
+	.show = syscall_list_show,
+};
+
+static
+int lttng_syscall_list_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &lttng_syscall_list_seq_ops);
+}
+
+const struct file_operations lttng_syscall_list_fops = {
+	.owner = THIS_MODULE,
+	.open = lttng_syscall_list_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = seq_release,
+};
+
+long lttng_channel_syscall_mask(struct lttng_channel *channel,
+		struct lttng_kernel_syscall_mask __user *usyscall_mask)
+{
+	uint32_t len, sc_tables_len, bitmask_len;
+	int ret = 0, bit;
+	char *tmp_mask;
+	struct lttng_syscall_filter *filter;
+
+	ret = get_user(len, &usyscall_mask->len);
+	if (ret)
+		return ret;
+	sc_tables_len = get_sc_tables_len();
+	bitmask_len = ALIGN(sc_tables_len, 8) >> 3;
+	if (len < sc_tables_len) {
+		return put_user(sc_tables_len, &usyscall_mask->len);
+	}
+	/* Array is large enough, we can copy array to user-space. */
+	tmp_mask = kzalloc(bitmask_len, GFP_KERNEL);
+	if (!tmp_mask)
+		return -ENOMEM;
+	filter = channel->sc_filter;
+
+	for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) {
+		bt_bitfield_write_be(tmp_mask, char, bit, 1,
+			test_bit(bit, filter->sc));
+	}
+	for (; bit < sc_tables_len; bit++) {
+		bt_bitfield_write_be(tmp_mask, char, bit, 1,
+			test_bit(bit - ARRAY_SIZE(sc_table),
+				filter->sc_compat));
+	}
+	if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len))
+		ret = -EFAULT;
+	kfree(tmp_mask);
+	return ret;
+}