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check_locking.c
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/*
* Copyright (C) 2009 Dan Carpenter.
* Copyright (C) 2019 Oracle.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
*/
#include <ctype.h>
#include "parse.h"
#include "smatch.h"
#include "smatch_extra.h"
#include "smatch_slist.h"
static int my_id;
STATE(locked);
STATE(half_locked);
STATE(start_state);
STATE(unlocked);
STATE(impossible);
STATE(restore);
STATE(ignore);
enum lock_type {
spin_lock,
read_lock,
write_lock,
mutex,
bottom_half,
irq,
sem,
prepare_lock,
enable_lock,
rcu,
rcu_read,
};
const char *get_lock_name(enum lock_type type)
{
static const char *names[] = {
[spin_lock] = "spin_lock",
[read_lock] = "read_lock",
[write_lock] = "write_lock",
[mutex] = "mutex",
[bottom_half] = "bottom_half",
[irq] = "irq",
[sem] = "sem",
[prepare_lock] = "prepare_lock",
[enable_lock] = "enable_lock",
[rcu] = "rcu",
[rcu_read] = "rcu_read",
};
return names[type];
}
#define RETURN_VAL -1
#define NO_ARG -2
struct lock_info {
const char *function;
int action;
enum lock_type type;
int arg;
const char *key;
const sval_t *implies_start, *implies_end;
func_hook *call_back;
};
static struct lock_info lock_table[] = {
{"spin_lock", LOCK, spin_lock, 0, "$"},
{"spin_unlock", UNLOCK, spin_lock, 0, "$"},
{"spin_lock_nested", LOCK, spin_lock, 0, "$"},
{"_spin_lock", LOCK, spin_lock, 0, "$"},
{"_spin_unlock", UNLOCK, spin_lock, 0, "$"},
{"_spin_lock_nested", LOCK, spin_lock, 0, "$"},
{"__spin_lock", LOCK, spin_lock, 0, "$"},
{"__spin_unlock", UNLOCK, spin_lock, 0, "$"},
{"__spin_lock_nested", LOCK, spin_lock, 0, "$"},
{"raw_spin_lock", LOCK, spin_lock, 0, "$"},
{"raw_spin_unlock", UNLOCK, spin_lock, 0, "$"},
{"_raw_spin_lock", LOCK, spin_lock, 0, "$"},
{"_raw_spin_lock_nested", LOCK, spin_lock, 0, "$"},
{"_raw_spin_unlock", UNLOCK, spin_lock, 0, "$"},
{"__raw_spin_lock", LOCK, spin_lock, 0, "$"},
{"__raw_spin_unlock", UNLOCK, spin_lock, 0, "$"},
{"spin_lock_irq", LOCK, spin_lock, 0, "$"},
{"spin_unlock_irq", UNLOCK, spin_lock, 0, "$"},
{"_spin_lock_irq", LOCK, spin_lock, 0, "$"},
{"_spin_unlock_irq", UNLOCK, spin_lock, 0, "$"},
{"__spin_lock_irq", LOCK, spin_lock, 0, "$"},
{"__spin_unlock_irq", UNLOCK, spin_lock, 0, "$"},
{"_raw_spin_lock_irq", LOCK, spin_lock, 0, "$"},
{"_raw_spin_unlock_irq", UNLOCK, spin_lock, 0, "$"},
{"__raw_spin_unlock_irq", UNLOCK, spin_lock, 0, "$"},
{"spin_lock_irqsave", LOCK, spin_lock, 0, "$"},
{"spin_unlock_irqrestore", UNLOCK, spin_lock, 0, "$"},
{"_spin_lock_irqsave", LOCK, spin_lock, 0, "$"},
{"_spin_unlock_irqrestore", UNLOCK, spin_lock, 0, "$"},
{"__spin_lock_irqsave", LOCK, spin_lock, 0, "$"},
{"__spin_unlock_irqrestore", UNLOCK, spin_lock, 0, "$"},
{"_raw_spin_lock_irqsave", LOCK, spin_lock, 0, "$"},
{"_raw_spin_unlock_irqrestore", UNLOCK, spin_lock, 0, "$"},
{"__raw_spin_lock_irqsave", LOCK, spin_lock, 0, "$"},
{"__raw_spin_unlock_irqrestore", UNLOCK, spin_lock, 0, "$"},
{"spin_lock_irqsave_nested", LOCK, spin_lock, 0, "$"},
{"_spin_lock_irqsave_nested", LOCK, spin_lock, 0, "$"},
{"__spin_lock_irqsave_nested", LOCK, spin_lock, 0, "$"},
{"_raw_spin_lock_irqsave_nested", LOCK, spin_lock, 0, "$"},
{"spin_lock_bh", LOCK, spin_lock, 0, "$"},
{"spin_unlock_bh", UNLOCK, spin_lock, 0, "$"},
{"_spin_lock_bh", LOCK, spin_lock, 0, "$"},
{"_spin_unlock_bh", UNLOCK, spin_lock, 0, "$"},
{"__spin_lock_bh", LOCK, spin_lock, 0, "$"},
{"__spin_unlock_bh", UNLOCK, spin_lock, 0, "$"},
{"spin_trylock", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"_spin_trylock", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"__spin_trylock", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"raw_spin_trylock", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"_raw_spin_trylock", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"spin_trylock_irq", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"spin_trylock_irqsave", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"spin_trylock_bh", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"_spin_trylock_bh", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"__spin_trylock_bh", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"__raw_spin_trylock", LOCK, spin_lock, 0, "$", &int_one, &int_one},
{"_atomic_dec_and_lock", LOCK, spin_lock, 1, "$", &int_one, &int_one},
{"read_lock", LOCK, read_lock, 0, "$"},
{"down_read", LOCK, read_lock, 0, "$"},
{"down_read_nested", LOCK, read_lock, 0, "$"},
{"down_read_trylock", LOCK, read_lock, 0, "$", &int_one, &int_one},
{"down_read_killable", LOCK, read_lock, 0, "$", &int_zero, &int_zero},
{"up_read", UNLOCK, read_lock, 0, "$"},
{"read_unlock", UNLOCK, read_lock, 0, "$"},
{"_read_lock", LOCK, read_lock, 0, "$"},
{"_read_unlock", UNLOCK, read_lock, 0, "$"},
{"__read_lock", LOCK, read_lock, 0, "$"},
{"__read_unlock", UNLOCK, read_lock, 0, "$"},
{"_raw_read_lock", LOCK, read_lock, 0, "$"},
{"_raw_read_unlock", UNLOCK, read_lock, 0, "$"},
{"__raw_read_lock", LOCK, read_lock, 0, "$"},
{"__raw_read_unlock", UNLOCK, read_lock, 0, "$"},
{"read_lock_irq", LOCK, read_lock, 0, "$"},
{"read_unlock_irq" , UNLOCK, read_lock, 0, "$"},
{"_read_lock_irq", LOCK, read_lock, 0, "$"},
{"_read_unlock_irq", UNLOCK, read_lock, 0, "$"},
{"__read_lock_irq", LOCK, read_lock, 0, "$"},
{"__read_unlock_irq", UNLOCK, read_lock, 0, "$"},
{"_raw_read_unlock_irq", UNLOCK, read_lock, 0, "$"},
{"_raw_read_lock_irq", LOCK, read_lock, 0, "$"},
{"_raw_read_lock_bh", LOCK, read_lock, 0, "$"},
{"_raw_read_unlock_bh", UNLOCK, read_lock, 0, "$"},
{"read_lock_irqsave", LOCK, read_lock, 0, "$"},
{"read_unlock_irqrestore", UNLOCK, read_lock, 0, "$"},
{"_read_lock_irqsave", LOCK, read_lock, 0, "$"},
{"_read_unlock_irqrestore", UNLOCK, read_lock, 0, "$"},
{"__read_lock_irqsave", LOCK, read_lock, 0, "$"},
{"__read_unlock_irqrestore", UNLOCK, read_lock, 0, "$"},
{"read_lock_bh", LOCK, read_lock, 0, "$"},
{"read_unlock_bh", UNLOCK, read_lock, 0, "$"},
{"_read_lock_bh", LOCK, read_lock, 0, "$"},
{"_read_unlock_bh", UNLOCK, read_lock, 0, "$"},
{"__read_lock_bh", LOCK, read_lock, 0, "$"},
{"__read_unlock_bh", UNLOCK, read_lock, 0, "$"},
{"__raw_read_lock_bh", LOCK, read_lock, 0, "$"},
{"__raw_read_unlock_bh", UNLOCK, read_lock, 0, "$"},
{"_raw_read_lock_irqsave", LOCK, read_lock, 0, "$"},
{"_raw_read_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"_raw_read_unlock_irqrestore", UNLOCK, read_lock, 0, "$"},
{"_raw_read_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"_raw_spin_lock_bh", LOCK, read_lock, 0, "$"},
{"_raw_spin_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"_raw_spin_lock_nest_lock", LOCK, read_lock, 0, "$"},
{"_raw_spin_unlock_bh", UNLOCK, read_lock, 0, "$"},
{"_raw_spin_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"_raw_write_lock_irqsave", LOCK, write_lock, 0, "$"},
{"_raw_write_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"_raw_write_unlock_irqrestore", UNLOCK, write_lock, 0, "$"},
{"_raw_write_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"__raw_write_unlock_irq", UNLOCK, write_lock, 0, "$"},
{"__raw_write_unlock_irq", UNLOCK, irq, 0, "irq"},
{"__raw_write_unlock_irqrestore", UNLOCK, write_lock, 0, "$"},
{"__raw_write_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"generic__raw_read_trylock", LOCK, read_lock, 0, "$", &int_one, &int_one},
{"read_trylock", LOCK, read_lock, 0, "$", &int_one, &int_one},
{"_read_trylock", LOCK, read_lock, 0, "$", &int_one, &int_one},
{"raw_read_trylock", LOCK, read_lock, 0, "$", &int_one, &int_one},
{"_raw_read_trylock", LOCK, read_lock, 0, "$", &int_one, &int_one},
{"__raw_read_trylock", LOCK, read_lock, 0, "$", &int_one, &int_one},
{"__read_trylock", LOCK, read_lock, 0, "$", &int_one, &int_one},
{"write_lock", LOCK, write_lock, 0, "$"},
{"down_write", LOCK, write_lock, 0, "$"},
{"down_write_nested", LOCK, write_lock, 0, "$"},
{"up_write", UNLOCK, write_lock, 0, "$"},
{"write_unlock", UNLOCK, write_lock, 0, "$"},
{"_write_lock", LOCK, write_lock, 0, "$"},
{"_write_unlock", UNLOCK, write_lock, 0, "$"},
{"__write_lock", LOCK, write_lock, 0, "$"},
{"__write_unlock", UNLOCK, write_lock, 0, "$"},
{"write_lock_irq", LOCK, write_lock, 0, "$"},
{"write_unlock_irq", UNLOCK, write_lock, 0, "$"},
{"_write_lock_irq", LOCK, write_lock, 0, "$"},
{"_write_unlock_irq", UNLOCK, write_lock, 0, "$"},
{"__write_lock_irq", LOCK, write_lock, 0, "$"},
{"__write_unlock_irq", UNLOCK, write_lock, 0, "$"},
{"_raw_write_unlock_irq", UNLOCK, write_lock, 0, "$"},
{"write_lock_irqsave", LOCK, write_lock, 0, "$"},
{"write_unlock_irqrestore", UNLOCK, write_lock, 0, "$"},
{"_write_lock_irqsave", LOCK, write_lock, 0, "$"},
{"_write_unlock_irqrestore", UNLOCK, write_lock, 0, "$"},
{"__write_lock_irqsave", LOCK, write_lock, 0, "$"},
{"__write_unlock_irqrestore", UNLOCK, write_lock, 0, "$"},
{"write_lock_bh", LOCK, write_lock, 0, "$"},
{"write_unlock_bh", UNLOCK, write_lock, 0, "$"},
{"_write_lock_bh", LOCK, write_lock, 0, "$"},
{"_write_unlock_bh", UNLOCK, write_lock, 0, "$"},
{"__write_lock_bh", LOCK, write_lock, 0, "$"},
{"__write_unlock_bh", UNLOCK, write_lock, 0, "$"},
{"_raw_write_lock", LOCK, write_lock, 0, "$"},
{"__raw_write_lock", LOCK, write_lock, 0, "$"},
{"_raw_write_unlock", UNLOCK, write_lock, 0, "$"},
{"__raw_write_unlock", UNLOCK, write_lock, 0, "$"},
{"_raw_write_lock_bh", LOCK, write_lock, 0, "$"},
{"_raw_write_unlock_bh", UNLOCK, write_lock, 0, "$"},
{"_raw_write_lock_irq", LOCK, write_lock, 0, "$"},
{"write_trylock", LOCK, write_lock, 0, "$", &int_one, &int_one},
{"_write_trylock", LOCK, write_lock, 0, "$", &int_one, &int_one},
{"raw_write_trylock", LOCK, write_lock, 0, "$", &int_one, &int_one},
{"_raw_write_trylock", LOCK, write_lock, 0, "$", &int_one, &int_one},
{"__write_trylock", LOCK, write_lock, 0, "$", &int_one, &int_one},
{"__raw_write_trylock", LOCK, write_lock, 0, "$", &int_one, &int_one},
{"down_write_trylock", LOCK, write_lock, 0, "$", &int_one, &int_one},
{"down_write_killable", LOCK, write_lock, 0, "$", &int_zero, &int_zero},
{"down", LOCK, sem, 0, "$"},
{"up", UNLOCK, sem, 0, "$"},
{"down_trylock", LOCK, sem, 0, "$", &int_zero, &int_zero},
{"down_timeout", LOCK, sem, 0, "$", &int_zero, &int_zero},
{"down_interruptible", LOCK, sem, 0, "$", &int_zero, &int_zero},
{"down_killable", LOCK, sem, 0, "$", &int_zero, &int_zero},
{"mutex_lock", LOCK, mutex, 0, "$"},
{"mutex_unlock", UNLOCK, mutex, 0, "$"},
{"mutex_destroy", RESTORE, mutex, 0, "$"},
{"mutex_lock_nested", LOCK, mutex, 0, "$"},
{"mutex_lock_io", LOCK, mutex, 0, "$"},
{"mutex_lock_io_nested", LOCK, mutex, 0, "$"},
{"mutex_lock_interruptible", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"mutex_lock_interruptible_nested", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"mutex_lock_killable", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"mutex_lock_killable_nested", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"mutex_trylock", LOCK, mutex, 0, "$", &int_one, &int_one},
{"ww_mutex_lock", LOCK, mutex, 0, "$"},
{"__ww_mutex_lock", LOCK, mutex, 0, "$"},
{"ww_mutex_lock_interruptible", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"ww_mutex_unlock", UNLOCK, mutex, 0, "$"},
{"raw_local_irq_disable", LOCK, irq, NO_ARG, "irq"},
{"raw_local_irq_enable", UNLOCK, irq, NO_ARG, "irq"},
{"spin_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"spin_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"_spin_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"_spin_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"__spin_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"__spin_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"_raw_spin_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"_raw_spin_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"__raw_spin_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"spin_trylock_irq", LOCK, irq, NO_ARG, "irq", &int_one, &int_one},
{"read_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"read_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"_read_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"_read_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"__read_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"_raw_read_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"__read_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"_raw_read_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"write_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"write_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"_write_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"_write_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"__write_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"__write_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"_raw_write_lock_irq", LOCK, irq, NO_ARG, "irq"},
{"_raw_write_unlock_irq", UNLOCK, irq, NO_ARG, "irq"},
{"arch_local_irq_save", LOCK, irq, RETURN_VAL, "$"},
{"arch_local_irq_restore", RESTORE, irq, 0, "$"},
{"__raw_local_irq_save", LOCK, irq, RETURN_VAL, "$"},
{"raw_local_irq_restore", RESTORE, irq, 0, "$"},
{"spin_lock_irqsave_nested", LOCK, irq, RETURN_VAL, "$"},
{"spin_lock_irqsave", LOCK, irq, 1, "$"},
{"spin_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"_spin_lock_irqsave_nested", LOCK, irq, RETURN_VAL, "$"},
{"_spin_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"_spin_lock_irqsave", LOCK, irq, 1, "$"},
{"_spin_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"__spin_lock_irqsave_nested", LOCK, irq, 1, "$"},
{"__spin_lock_irqsave", LOCK, irq, 1, "$"},
{"__spin_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"_raw_spin_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"_raw_spin_lock_irqsave", LOCK, irq, 1, "$"},
{"_raw_spin_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"__raw_spin_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"__raw_spin_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"_raw_spin_lock_irqsave_nested", LOCK, irq, RETURN_VAL, "$"},
{"spin_trylock_irqsave", LOCK, irq, 1, "$", &int_one, &int_one},
{"read_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"read_lock_irqsave", LOCK, irq, 1, "$"},
{"read_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"_read_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"_read_lock_irqsave", LOCK, irq, 1, "$"},
{"_read_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"__read_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"__read_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"write_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"write_lock_irqsave", LOCK, irq, 1, "$"},
{"write_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"_write_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"_write_lock_irqsave", LOCK, irq, 1, "$"},
{"_write_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"__write_lock_irqsave", LOCK, irq, RETURN_VAL, "$"},
{"__write_unlock_irqrestore", RESTORE, irq, 1, "$"},
{"local_bh_disable", LOCK, bottom_half, NO_ARG, "bh"},
{"_local_bh_disable", LOCK, bottom_half, NO_ARG, "bh"},
{"__local_bh_disable", LOCK, bottom_half, NO_ARG, "bh"},
{"local_bh_enable", UNLOCK, bottom_half, NO_ARG, "bh"},
{"_local_bh_enable", UNLOCK, bottom_half, NO_ARG, "bh"},
{"__local_bh_enable", UNLOCK, bottom_half, NO_ARG, "bh"},
{"spin_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"spin_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"_spin_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"_spin_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"__spin_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"__spin_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"read_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"read_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"_read_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"_read_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"__read_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"__read_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"_raw_read_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"_raw_read_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"write_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"write_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"_write_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"_write_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"__write_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"__write_unlock_bh", UNLOCK, bottom_half, NO_ARG, "bh"},
{"_raw_write_lock_bh", LOCK, bottom_half, NO_ARG, "bh"},
{"_raw_write_unlock_bh",UNLOCK, bottom_half, NO_ARG, "bh"},
{"spin_trylock_bh", LOCK, bottom_half, NO_ARG, "bh", &int_one, &int_one},
{"_spin_trylock_bh", LOCK, bottom_half, NO_ARG, "bh", &int_one, &int_one},
{"__spin_trylock_bh", LOCK, bottom_half, NO_ARG, "bh", &int_one, &int_one},
{"ffs_mutex_lock", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"clk_prepare_lock", LOCK, prepare_lock, NO_ARG, "clk"},
{"clk_prepare_unlock", UNLOCK, prepare_lock, NO_ARG, "clk"},
{"clk_enable_lock", LOCK, enable_lock, -1, "$"},
{"clk_enable_unlock", UNLOCK, enable_lock, 0, "$"},
{"dma_resv_lock", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"dma_resv_trylock", LOCK, mutex, 0, "$", &int_one, &int_one},
{"dma_resv_lock_interruptible", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"dma_resv_unlock", UNLOCK, mutex, 0, "$"},
{"modeset_lock", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"drm_ modeset_lock", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"drm_modeset_lock_single_interruptible", LOCK, mutex, 0, "$", &int_zero, &int_zero},
{"modeset_unlock", UNLOCK, mutex, 0, "$"},
// {"nvkm_i2c_aux_acquire", LOCK, mutex,
{"i915_gem_object_lock_interruptible", LOCK, mutex, 0, "$->base.resv", &int_zero, &int_zero},
{"i915_gem_object_lock", LOCK, mutex, 0, "$->base.resv"},
{"reiserfs_write_lock_nested", LOCK, mutex, 0, "$"},
{"reiserfs_write_unlock_nested", UNLOCK, mutex, 0, "$"},
{"rw_lock", LOCK, write_lock, 1, "$"},
{"rw_unlock", UNLOCK, write_lock, 1, "$"},
{"sem_lock", LOCK, mutex, 0, "$"},
{"sem_unlock", UNLOCK, mutex, 0, "$"},
{"rcu_lock_acquire", LOCK, rcu, NO_ARG, "rcu"},
{"rcu_lock_release", UNLOCK, rcu, NO_ARG, "rcu"},
{"rcu_read_lock", LOCK, rcu_read, NO_ARG, "rcu_read"},
{"rcu_read_unlock", UNLOCK, rcu_read, NO_ARG, "rcu_read"},
{"rcu_read_lock_bh", LOCK, rcu_read, NO_ARG, "rcu_read"},
{"rcu_read_unlock_bh", UNLOCK, rcu_read, NO_ARG, "rcu_read"},
{"rcu_read_lock_sched", LOCK, rcu_read, NO_ARG, "rcu_read"},
{"rcu_read_lock_sched_notrace", LOCK, rcu_read, NO_ARG, "rcu_read"},
{"rcu_read_unlock_sched", UNLOCK, rcu_read, NO_ARG, "rcu_read"},
{"rcu_read_unlock_sched_notrace", UNLOCK, rcu_read, NO_ARG, "rcu_read"},
{"bch_write_bdev_super", IGNORE_LOCK, sem, 0, "&$->sb_write_mutex"},
{"dlfb_set_video_mode", IGNORE_LOCK, sem, 0, "&$->urbs.limit_sem"},
{"efx_rwsem_assert_write_locked", IGNORE_LOCK, sem, 0, "&"},
// The i915_gem_ww_ctx_unlock_all() is too complicated
{"i915_gem_object_pin_pages_unlocked", IGNORE_LOCK, mutex, 0, "$->base.resv"},
{"i915_gem_object_pin_map_unlocked", IGNORE_LOCK, mutex, 0, "$->base.resv"},
{"i915_gem_object_fill_blt", IGNORE_LOCK, mutex, 0, "$->base.resv"},
{"i915_vma_pin", IGNORE_LOCK, mutex, 0, "$->base.resv"},
{},
};
struct macro_info {
const char *macro;
int action;
int param;
};
static struct macro_info macro_table[] = {
{"genpd_lock", LOCK, 0},
{"genpd_lock_nested", LOCK, 0},
{"genpd_lock_interruptible", LOCK, 0},
{"genpd_unlock", UNLOCK, 0},
};
static const char *false_positives[][2] = {
{"fs/jffs2/", "->alloc_sem"},
{"fs/xfs/", "->b_sema"},
{"mm/", "pvmw->ptl"},
{"drivers/gpu/drm/i915/", "->base.resv"},
};
static struct stree *start_states;
static struct tracker_list *locks;
static struct expression *ignored_reset;
static void reset(struct sm_state *sm, struct expression *mod_expr)
{
struct expression *faked;
if (mod_expr && mod_expr->type == EXPR_ASSIGNMENT &&
mod_expr->left == ignored_reset)
return;
faked = get_faked_expression();
if (faked && faked->type == EXPR_ASSIGNMENT &&
faked->left == ignored_reset)
return;
set_state(my_id, sm->name, sm->sym, &start_state);
}
static struct smatch_state *get_start_state(struct sm_state *sm)
{
struct smatch_state *orig;
if (!sm)
return NULL;
orig = get_state_stree(start_states, my_id, sm->name, sm->sym);
if (orig)
return orig;
return NULL;
}
static struct expression *remove_spinlock_check(struct expression *expr)
{
if (expr->type != EXPR_CALL)
return expr;
if (expr->fn->type != EXPR_SYMBOL)
return expr;
if (strcmp(expr->fn->symbol_name->name, "spinlock_check"))
return expr;
expr = get_argument_from_call_expr(expr->args, 0);
return expr;
}
static struct expression *filter_kernel_args(struct expression *arg)
{
if (arg->type == EXPR_PREOP && arg->op == '&')
return strip_expr(arg->unop);
if (!is_pointer(arg))
return arg;
return deref_expression(strip_expr(arg));
}
static char *lock_to_name_sym(struct expression *expr, struct symbol **sym)
{
expr = remove_spinlock_check(expr);
expr = filter_kernel_args(expr);
return expr_to_str_sym(expr, sym);
}
static struct smatch_state *unmatched_state(struct sm_state *sm)
{
return &start_state;
}
static void pre_merge_hook(struct sm_state *cur, struct sm_state *other)
{
if (is_impossible_path())
set_state(my_id, cur->name, cur->sym, &impossible);
}
static struct smatch_state *merge_func(struct smatch_state *s1, struct smatch_state *s2)
{
if (s1 == &impossible)
return s2;
if (s2 == &impossible)
return s1;
return &merged;
}
static struct sm_state *get_best_match(const char *key, int lock_unlock)
{
struct sm_state *sm;
struct sm_state *match;
int cnt = 0;
int start_pos, state_len, key_len, chunks, i;
if (strncmp(key, "$->", 3) == 0)
key += 3;
key_len = strlen(key);
chunks = 0;
for (i = key_len - 1; i > 0; i--) {
if (key[i] == '>' || key[i] == '.')
chunks++;
if (chunks == 2) {
key += (i + 1);
key_len = strlen(key);
break;
}
}
FOR_EACH_MY_SM(my_id, __get_cur_stree(), sm) {
if (((lock_unlock == UNLOCK || lock_unlock == RESTORE) &&
sm->state != &locked) ||
(lock_unlock == LOCK && sm->state != &unlocked))
continue;
state_len = strlen(sm->name);
if (state_len < key_len)
continue;
start_pos = state_len - key_len;
if ((start_pos == 0 || !isalnum(sm->name[start_pos - 1])) &&
strcmp(sm->name + start_pos, key) == 0) {
cnt++;
match = sm;
}
} END_FOR_EACH_SM(sm);
if (cnt == 1)
return match;
return NULL;
}
static char *use_best_match(const char *key, int lock_unlock, struct symbol **sym)
{
struct sm_state *match;
match = get_best_match(key, lock_unlock);
if (!match) {
*sym = NULL;
return alloc_string(key);
}
*sym = match->sym;
return alloc_string(match->name);
}
static void set_start_state(const char *name, struct symbol *sym, struct smatch_state *start)
{
struct smatch_state *orig;
orig = get_state_stree(start_states, my_id, name, sym);
if (!orig)
set_state_stree(&start_states, my_id, name, sym, start);
else if (orig != start)
set_state_stree(&start_states, my_id, name, sym, &undefined);
}
static bool common_false_positive(const char *name)
{
const char *path, *lname;
int i, len_total, len_path, len_name, skip;
if (!get_filename())
return false;
len_total = strlen(name);
for (i = 0; i < ARRAY_SIZE(false_positives); i++) {
path = false_positives[i][0];
lname = false_positives[i][1];
len_path = strlen(path);
len_name = strlen(lname);
if (len_name > len_total)
continue;
skip = len_total - len_name;
if (strncmp(get_filename(), path, len_path) == 0 &&
strcmp(name + skip, lname) == 0)
return true;
}
return false;
}
static bool sm_in_start_states(struct sm_state *sm)
{
if (!sm || !cur_func_sym)
return false;
if (sm->line == cur_func_sym->pos.line)
return true;
return false;
}
static void warn_on_double(struct sm_state *sm, struct smatch_state *state)
{
struct sm_state *tmp;
if (!sm)
return;
FOR_EACH_PTR(sm->possible, tmp) {
if (tmp->state == state)
goto found;
} END_FOR_EACH_PTR(tmp);
return;
found:
// FIXME: called with read_lock held
// drivers/scsi/aic7xxx/aic7xxx_osm.c:1591 ahc_linux_isr() error: double locked 'flags' (orig line 1584)
if (strcmp(sm->name, "bottom_half") == 0)
return;
if (strstr(sm->name, "rcu"))
return;
if (common_false_positive(sm->name))
return;
if (state == &locked && sm_in_start_states(tmp)) {
// sm_warning("called with lock held. '%s'", sm->name);
} else {
// sm_msg("error: double %s '%s' (orig line %u)",
// state->name, sm->name, tmp->line);
}
}
static bool handle_macro_lock_unlock(void)
{
struct expression *expr, *arg;
struct macro_info *info;
struct sm_state *sm;
struct symbol *sym;
const char *macro;
char *name;
bool ret = false;
int i;
expr = last_ptr_list((struct ptr_list *)big_expression_stack);
while (expr && expr->type == EXPR_ASSIGNMENT)
expr = strip_expr(expr->right);
if (!expr || expr->type != EXPR_CALL)
return false;
macro = get_macro_name(expr->pos);
if (!macro)
return false;
for (i = 0; i < ARRAY_SIZE(macro_table); i++) {
info = ¯o_table[i];
if (strcmp(macro, info->macro) != 0)
continue;
arg = get_argument_from_call_expr(expr->args, info->param);
name = expr_to_str_sym(arg, &sym);
if (!name || !sym)
goto free;
sm = get_sm_state(my_id, name, sym);
if (info->action == LOCK) {
if (!get_start_state(sm))
set_start_state(name, sym, &unlocked);
if (sm && sm->line != expr->pos.line)
warn_on_double(sm, &locked);
set_state(my_id, name, sym, &locked);
} else {
if (!get_start_state(sm))
set_start_state(name, sym, &locked);
if (sm && sm->line != expr->pos.line)
warn_on_double(sm, &unlocked);
set_state(my_id, name, sym, &unlocked);
}
ret = true;
free:
free_string(name);
return ret;
}
return false;
}
static bool is_local_IRQ_save(const char *name, struct symbol *sym, struct lock_info *info)
{
if (name && strcmp(name, "flags") == 0)
return true;
if (!sym)
return false;
if (!sym->ident || strcmp(sym->ident->name, name) != 0)
return false;
if (!info)
return false;
return strstr(info->function, "irq") && strstr(info->function, "save");
}
static void do_lock(const char *name, struct symbol *sym, struct lock_info *info)
{
struct sm_state *sm;
bool delete_null = false;
if (!info && handle_macro_lock_unlock())
return;
add_tracker(&locks, my_id, name, sym);
sm = get_sm_state(my_id, name, sym);
if (!get_start_state(sm))
set_start_state(name, sym, &unlocked);
if (!sm && !is_local_IRQ_save(name, sym, info) && !sym) {
sm = get_best_match(name, LOCK);
if (sm) {
name = sm->name;
if (sm->sym)
sym = sm->sym;
else
delete_null = true;
}
}
warn_on_double(sm, &locked);
if (delete_null)
set_state(my_id, name, NULL, &ignore);
set_state(my_id, name, sym, &locked);
}
static void do_unlock(const char *name, struct symbol *sym, struct lock_info *info)
{
struct sm_state *sm;
bool delete_null = false;
if (__path_is_null())
return;
if (!info && handle_macro_lock_unlock())
return;
add_tracker(&locks, my_id, name, sym);
sm = get_sm_state(my_id, name, sym);
if (!sm && !info && !is_local_IRQ_save(name, sym, info)) {
sm = get_best_match(name, UNLOCK);
if (sm) {
name = sm->name;
if (sm->sym)
sym = sm->sym;
else
delete_null = true;
}
}
if (!get_start_state(sm))
set_start_state(name, sym, &locked);
warn_on_double(sm, &unlocked);
if (delete_null)
set_state(my_id, name, NULL, &ignore);
set_state(my_id, name, sym, &unlocked);
}
static void do_restore(const char *name, struct symbol *sym, struct lock_info *info)
{
struct sm_state *sm;
if (__path_is_null())
return;
sm = get_sm_state(my_id, name, sym);
if (!get_start_state(sm))
set_start_state(name, sym, &locked);
add_tracker(&locks, my_id, name, sym);
set_state(my_id, name, sym, &restore);
}
static int get_db_type(struct sm_state *sm)
{
/*
* Bottom half is complicated because it's nestable.
* Say it's merged at the start and we lock and unlock then
* it should go back to merged.
*/
if (sm->state == get_start_state(sm)) {
if (sm->state == &locked)
return KNOWN_LOCKED;
if (sm->state == &unlocked)
return KNOWN_UNLOCKED;
}
if (sm->state == &locked)
return LOCK;
if (sm->state == &unlocked)
return UNLOCK;
if (sm->state == &restore)
return RESTORE;
return LOCK;
}
static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
{
struct smatch_state *start;
struct sm_state *sm;
const char *param_name;
int param;
FOR_EACH_MY_SM(my_id, __get_cur_stree(), sm) {
if (sm->state != &locked &&
sm->state != &unlocked &&
sm->state != &restore)
continue;
if (sm->name[0] == '$')
continue;
/*
* If the state is locked at the end, that doesn't mean
* anything. It could be been locked at the start. Or
* it could be &merged at the start but its locked now
* because of implications and not because we set the
* state.
*
* This is slightly a hack, but when we change the state, we
* call set_start_state() so if get_start_state() returns NULL
* that means we haven't manually the locked state.
*/
start = get_start_state(sm);
if (sm->state == &restore) {
if (start != &locked)
continue;
} else if (!start || sm->state == start)
continue; /* !start means it was passed in */
param = get_param_key_from_sm(sm, expr, ¶m_name);
sql_insert_return_states(return_id, return_ranges,
get_db_type(sm),
param, param_name, "");
} END_FOR_EACH_SM(sm);
}
static int sm_both_locked_and_unlocked(struct sm_state *sm)
{
int is_locked = 0;
int is_unlocked = 0;
struct sm_state *tmp;
if (sm->state != &merged)
return 0;
FOR_EACH_PTR(sm->possible, tmp) {
if (tmp->state == &locked)
is_locked = 1;
if (tmp->state == &unlocked)
is_unlocked = 1;
} END_FOR_EACH_PTR(tmp);
return is_locked && is_unlocked;
}
enum {
ERR_PTR, VALID_PTR, NEGATIVE, ZERO, POSITIVE, NUM_BUCKETS,
};
static bool is_EINTR(struct range_list *rl)
{
sval_t sval;
if (!rl_to_sval(rl, &sval))
return false;
return sval.value == -4;
}
static int success_fail_positive(struct range_list *rl)
{
/* void returns are the same as success (zero in the kernel) */
if (!rl)
return ZERO;
if (rl_type(rl)->type != SYM_PTR &&
!is_whole_rl(rl) &&
sval_is_negative(rl_min(rl)))
return NEGATIVE;
if (rl_min(rl).value == 0 && rl_max(rl).value == 0)
return ZERO;
if (is_err_ptr(rl_min(rl)) &&
is_err_ptr(rl_max(rl)))
return ERR_PTR;
/*
* Trying to match ERR_PTR(ret) but without the expression struct.
* Ugly...
*/
if (type_bits(&long_ctype) == 64 &&
rl_type(rl)->type == SYM_PTR &&
rl_min(rl).value == INT_MIN)
return ERR_PTR;
return POSITIVE;
}
static bool sym_in_lock_table(struct symbol *sym)
{
int i;
if (!sym || !sym->ident)
return false;
for (i = 0; lock_table[i].function != NULL; i++) {
if (strcmp(lock_table[i].function, sym->ident->name) == 0)
return true;
}
return false;
}
static bool func_in_lock_table(struct expression *expr)
{
if (expr->type != EXPR_SYMBOL)
return false;
return sym_in_lock_table(expr->symbol);
}
static void check_lock(char *name, struct symbol *sym)
{
struct range_list *locked_lines = NULL;
struct range_list *unlocked_lines = NULL;
int locked_buckets[NUM_BUCKETS] = {};
int unlocked_buckets[NUM_BUCKETS] = {};
struct stree *stree, *orig;
struct sm_state *return_sm;
struct sm_state *sm;
sval_t line = sval_type_val(&int_ctype, 0);
int bucket;
int i;
if (sym_in_lock_table(cur_func_sym))
return;
FOR_EACH_PTR(get_all_return_strees(), stree) {
orig = __swap_cur_stree(stree);
if (is_impossible_path())
goto swap_stree;
return_sm = get_sm_state(RETURN_ID, "return_ranges", NULL);
if (!return_sm)
goto swap_stree;
line.value = return_sm->line;
sm = get_sm_state(my_id, name, sym);
if (!sm)
goto swap_stree;
if (parent_is_gone_var_sym(sm->name, sm->sym))
goto swap_stree;
if (sm->state != &locked &&
sm->state != &unlocked &&
sm->state != &restore)
goto swap_stree;
if ((sm->state == &unlocked || sm->state == &restore) &&
is_EINTR(estate_rl(return_sm->state)))
goto swap_stree;