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ANDROID: Incremental fs: Fix crash polling 0 size read_log

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When read log is 0 sized, we still need to init the wait queue to avoid
kernel panics if someone does decide to poll on the read log.

Test: Added test for this condition, incfs_test crashes
	With fix, incfs_test doesn't crash
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Bug: 152909243
Change-Id: Ic3250523bb7ddb1839f8e95852c17103e5ffb782
This commit is contained in:
Paul Lawrence 2020-03-31 15:05:33 -07:00
parent 21b6d8c954
commit 759d52ee9e
2 changed files with 49 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
fs/incfs/data_mgmt.c
View file

@ -34,13 +34,13 @@ struct mount_info *incfs_alloc_mount_info(struct super_block *sb,
mutex_init(&mi->mi_dir_struct_mutex);
mutex_init(&mi->mi_pending_reads_mutex);
init_waitqueue_head(&mi->mi_pending_reads_notif_wq);
init_waitqueue_head(&mi->mi_log.ml_notif_wq);
INIT_LIST_HEAD(&mi->mi_reads_list_head);
if (options->read_log_pages != 0) {
size_t buf_size = PAGE_SIZE * options->read_log_pages;
spin_lock_init(&mi->mi_log.rl_writer_lock);
init_waitqueue_head(&mi->mi_log.ml_notif_wq);
mi->mi_log.rl_size = buf_size / sizeof(*mi->mi_log.rl_ring_buf);
mi->mi_log.rl_ring_buf = kzalloc(buf_size, GFP_NOFS);

55
tools/testing/selftests/filesystems/incfs/incfs_test.c
View file

@ -1930,7 +1930,8 @@ failure:
return TEST_FAILURE;
}
static int validate_logs(char *mount_dir, int log_fd, struct test_file *file)
static int validate_logs(char *mount_dir, int log_fd, struct test_file *file,
bool no_rlog)
{
uint8_t data[INCFS_DATA_FILE_BLOCK_SIZE];
struct incfs_pending_read_info prs[100] = {};
@ -1957,7 +1958,19 @@ static int validate_logs(char *mount_dir, int log_fd, struct test_file *file)
goto failure;
}
read_count = wait_for_pending_reads(log_fd, 0, prs, prs_size);
read_count =
wait_for_pending_reads(log_fd, no_rlog ? 10 : 0, prs, prs_size);
if (no_rlog) {
if (read_count == 0)
goto success;
if (read_count < 0)
ksft_print_msg("Error reading logged reads %s.\n",
strerror(-read_count));
else
ksft_print_msg("Somehow read empty logs.\n");
goto failure;
}
if (read_count < 0) {
ksft_print_msg("Error reading logged reads %s.\n",
strerror(-read_count));
@ -2001,6 +2014,8 @@ static int validate_logs(char *mount_dir, int log_fd, struct test_file *file)
goto failure;
}
}
success:
close(fd);
return TEST_SUCCESS;
@ -2029,7 +2044,7 @@ static int read_log_test(char *mount_dir)
goto failure;
log_fd = open_log_file(mount_dir);
if (cmd_fd < 0)
if (log_fd < 0)
ksft_print_msg("Can't open log file.\n");
/* Write data. */
@ -2048,7 +2063,7 @@ static int read_log_test(char *mount_dir)
for (i = 0; i < file_num; i++) {
struct test_file *file = &test.files[i];
if (validate_logs(mount_dir, log_fd, file))
if (validate_logs(mount_dir, log_fd, file, false))
goto failure;
}
@ -2069,19 +2084,45 @@ static int read_log_test(char *mount_dir)
goto failure;
log_fd = open_log_file(mount_dir);
if (cmd_fd < 0)
if (log_fd < 0)
ksft_print_msg("Can't open log file.\n");
/* Validate data again */
for (i = 0; i < file_num; i++) {
struct test_file *file = &test.files[i];
if (validate_logs(mount_dir, log_fd, file))
if (validate_logs(mount_dir, log_fd, file, false))
goto failure;
}
/*
* Unmount and mount again with no read log to make sure poll
* doesn't crash
*/
close(cmd_fd);
close(log_fd);
if (umount(mount_dir) != 0) {
print_error("Can't unmout FS");
goto failure;
}
if (mount_fs_opt(mount_dir, backing_dir, "readahead=0,rlog_pages=0") !=
0)
goto failure;
log_fd = open_log_file(mount_dir);
if (log_fd < 0)
ksft_print_msg("Can't open log file.\n");
/* Validate data again - note should fail this time */
for (i = 0; i < file_num; i++) {
struct test_file *file = &test.files[i];
if (validate_logs(mount_dir, log_fd, file, true))
goto failure;
}
/* Final unmount */
close(cmd_fd);
close(log_fd);
free(backing_dir);
if (umount(mount_dir) != 0) {