#include <linux/in6.h>
#include <linux/seq_file.h>
#include <linux/stringify.h>
+#include <linux/file.h>
+#include <linux/anon_inodes.h>
#include <asm/ptrace.h>
#include <asm/syscall.h>
#define PARAMS(args...) args
/* Handle unknown syscalls */
+#undef TRACE_SYSTEM
#define TRACE_SYSTEM syscalls_unknown
#include "instrumentation/syscalls/headers/syscalls_unknown.h"
#undef TRACE_SYSTEM
filter = rcu_dereference(chan->sc_filter);
if (filter) {
- if (id >= NR_compat_syscalls
+ if (id < 0 || id >= NR_compat_syscalls
|| !test_bit(id, filter->sc_compat)) {
/* System call filtered out. */
return;
filter = rcu_dereference(chan->sc_filter);
if (filter) {
- if (id >= NR_syscalls
+ if (id < 0 || id >= NR_syscalls
|| !test_bit(id, filter->sc)) {
/* System call filtered out. */
return;
table_len = ARRAY_SIZE(sc_table);
unknown_event = chan->sc_unknown;
}
- if (unlikely(id >= table_len)) {
+ if (unlikely(id < 0 || id >= table_len)) {
syscall_entry_unknown(unknown_event, regs, id);
return;
}
}
static void syscall_exit_unknown(struct lttng_event *event,
- struct pt_regs *regs, unsigned int id, long ret)
+ struct pt_regs *regs, int id, long ret)
{
unsigned long args[UNKNOWN_SYSCALL_NRARGS];
filter = rcu_dereference(chan->sc_filter);
if (filter) {
- if (id >= NR_compat_syscalls
+ if (id < 0 || id >= NR_compat_syscalls
|| !test_bit(id, filter->sc_compat)) {
/* System call filtered out. */
return;
filter = rcu_dereference(chan->sc_filter);
if (filter) {
- if (id >= NR_syscalls
+ if (id < 0 || id >= NR_syscalls
|| !test_bit(id, filter->sc)) {
/* System call filtered out. */
return;
table_len = ARRAY_SIZE(sc_exit_table);
unknown_event = chan->sc_exit_unknown;
}
- if (unlikely(id >= table_len)) {
+ if (unlikely(id < 0 || id >= table_len)) {
syscall_exit_unknown(unknown_event, regs, id, ret);
return;
}
WARN_ON_ONCE(!chan->sc_table);
if (!chan->sc_filter) {
+ if (!chan->syscall_all)
+ return -EEXIST;
filter = kzalloc(sizeof(struct lttng_syscall_filter),
GFP_KERNEL);
if (!filter)
}
if (!name) {
+ /* Fail if all syscalls are already disabled. */
+ if (bitmap_empty(filter->sc, NR_syscalls)
+ && bitmap_empty(filter->sc_compat,
+ NR_compat_syscalls)) {
+ ret = -EEXIST;
+ goto error;
+ }
+
/* Disable all system calls */
bitmap_clear(filter->sc, 0, NR_syscalls);
bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);
goto error;
}
if (syscall_nr >= 0) {
- if (!test_bit(syscall_nr, chan->sc_filter->sc)) {
+ if (!test_bit(syscall_nr, filter->sc)) {
ret = -EEXIST;
goto error;
}
- bitmap_clear(chan->sc_filter->sc, syscall_nr, 1);
+ bitmap_clear(filter->sc, syscall_nr, 1);
}
if (compat_syscall_nr >= 0) {
- if (!test_bit(compat_syscall_nr, chan->sc_filter->sc_compat)) {
+ if (!test_bit(compat_syscall_nr, filter->sc_compat)) {
ret = -EEXIST;
goto error;
}
- bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1);
+ bitmap_clear(filter->sc_compat, compat_syscall_nr, 1);
}
apply_filter:
if (!chan->sc_filter)
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));
+ bool state;
+
+ if (channel->sc_table) {
+ if (filter)
+ state = test_bit(bit, filter->sc);
+ else
+ state = 1;
+ } else {
+ state = 0;
+ }
+ bt_bitfield_write_be(tmp_mask, char, bit, 1, state);
}
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));
+ bool state;
+
+ if (channel->compat_sc_table) {
+ if (filter)
+ state = test_bit(bit - ARRAY_SIZE(sc_table),
+ filter->sc_compat);
+ else
+ state = 1;
+ } else {
+ state = 0;
+ }
+ bt_bitfield_write_be(tmp_mask, char, bit, 1, state);
}
if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len))
ret = -EFAULT;
kfree(tmp_mask);
return ret;
}
+
+int lttng_abi_syscall_list(void)
+{
+ struct file *syscall_list_file;
+ int file_fd, ret;
+
+ file_fd = get_unused_fd();
+ if (file_fd < 0) {
+ ret = file_fd;
+ goto fd_error;
+ }
+
+ syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
+ <tng_syscall_list_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(syscall_list_file)) {
+ ret = PTR_ERR(syscall_list_file);
+ goto file_error;
+ }
+ ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
+ if (ret < 0)
+ goto open_error;
+ fd_install(file_fd, syscall_list_file);
+ if (file_fd < 0) {
+ ret = file_fd;
+ goto fd_error;
+ }
+ return file_fd;
+
+open_error:
+ fput(syscall_list_file);
+file_error:
+ put_unused_fd(file_fd);
+fd_error:
+ return ret;
+}