From 2ca4c92f58f9386e080b26f9ccd78c9ca5825a42 Mon Sep 17 00:00:00 2001 From: Alasdair G Kergon Date: Tue, 2 Aug 2011 12:32:03 +0100 Subject: dm ioctl: prevent empty message Detect invalid empty messages in core dm instead of requiring every target to check this. Signed-off-by: Alasdair G Kergon --- drivers/md/dm-ioctl.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/md/dm-ioctl.c') diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 4cacdad2270..1622a6bc0bf 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1402,6 +1402,11 @@ static int target_message(struct dm_ioctl *param, size_t param_size) goto out; } + if (!argc) { + DMWARN("Empty message received."); + goto out; + } + table = dm_get_live_table(md); if (!table) goto out_argv; -- cgit v1.2.3-70-g09d2 From 0ddf9644cc26e74ed671525e61a17bdbebf18da6 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Tue, 2 Aug 2011 12:32:06 +0100 Subject: dm ioctl: fill in device parameters in more ioctls Move parameter filling from find_device to __find_device_hash_cell. This patch causes ioctls using __find_device_hash_cell (DM_DEV_REMOVE_CMD, DM_DEV_SUSPEND_CMD - resume, DM_TABLE_CLEAR_CMD) to return device parameters, bringing them into line with the other ioctls. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/dm-ioctl.c | 63 +++++++++++++++++++++++++++--------------------- include/linux/dm-ioctl.h | 4 +-- 2 files changed, 38 insertions(+), 29 deletions(-) (limited to 'drivers/md/dm-ioctl.c') diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 1622a6bc0bf..99d38a6925a 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -719,24 +719,49 @@ static int dev_create(struct dm_ioctl *param, size_t param_size) static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) { struct mapped_device *md; - void *mdptr = NULL; + struct hash_cell *hc = NULL; - if (*param->uuid) - return __get_uuid_cell(param->uuid); + if (*param->uuid) { + hc = __get_uuid_cell(param->uuid); + if (!hc) + return NULL; + goto fill_params; + } - if (*param->name) - return __get_name_cell(param->name); + if (*param->name) { + hc = __get_name_cell(param->name); + if (!hc) + return NULL; + goto fill_params; + } md = dm_get_md(huge_decode_dev(param->dev)); if (!md) - goto out; + return NULL; - mdptr = dm_get_mdptr(md); - if (!mdptr) + hc = dm_get_mdptr(md); + if (!hc) { dm_put(md); + return NULL; + } -out: - return mdptr; +fill_params: + /* + * Sneakily write in both the name and the uuid + * while we have the cell. + */ + strlcpy(param->name, hc->name, sizeof(param->name)); + if (hc->uuid) + strlcpy(param->uuid, hc->uuid, sizeof(param->uuid)); + else + param->uuid[0] = '\0'; + + if (hc->new_map) + param->flags |= DM_INACTIVE_PRESENT_FLAG; + else + param->flags &= ~DM_INACTIVE_PRESENT_FLAG; + + return hc; } static struct mapped_device *find_device(struct dm_ioctl *param) @@ -746,24 +771,8 @@ static struct mapped_device *find_device(struct dm_ioctl *param) down_read(&_hash_lock); hc = __find_device_hash_cell(param); - if (hc) { + if (hc) md = hc->md; - - /* - * Sneakily write in both the name and the uuid - * while we have the cell. - */ - strlcpy(param->name, hc->name, sizeof(param->name)); - if (hc->uuid) - strlcpy(param->uuid, hc->uuid, sizeof(param->uuid)); - else - param->uuid[0] = '\0'; - - if (hc->new_map) - param->flags |= DM_INACTIVE_PRESENT_FLAG; - else - param->flags &= ~DM_INACTIVE_PRESENT_FLAG; - } up_read(&_hash_lock); return md; diff --git a/include/linux/dm-ioctl.h b/include/linux/dm-ioctl.h index 3708455ee6c..0cb8eff76bd 100644 --- a/include/linux/dm-ioctl.h +++ b/include/linux/dm-ioctl.h @@ -267,9 +267,9 @@ enum { #define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl) #define DM_VERSION_MAJOR 4 -#define DM_VERSION_MINOR 20 +#define DM_VERSION_MINOR 21 #define DM_VERSION_PATCHLEVEL 0 -#define DM_VERSION_EXTRA "-ioctl (2011-02-02)" +#define DM_VERSION_EXTRA "-ioctl (2011-07-06)" /* Status bits */ #define DM_READONLY_FLAG (1 << 0) /* In/Out */ -- cgit v1.2.3-70-g09d2 From ba2e19b0f4ccd6920fe175a86521ff18ede260cb Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Tue, 2 Aug 2011 12:32:06 +0100 Subject: dm ioctl: introduce __get_dev_cell Move logic to find device based on major/minor number to a separate function __get_dev_cell (similar to __get_uuid_cell and __get_name_cell). This makes the function __find_device_hash_cell more straightforward. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/dm-ioctl.c | 41 ++++++++++++++++++++++++----------------- 1 file changed, 24 insertions(+), 17 deletions(-) (limited to 'drivers/md/dm-ioctl.c') diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 99d38a6925a..4c350914f4a 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -128,6 +128,24 @@ static struct hash_cell *__get_uuid_cell(const char *str) return NULL; } +static struct hash_cell *__get_dev_cell(uint64_t dev) +{ + struct mapped_device *md; + struct hash_cell *hc; + + md = dm_get_md(huge_decode_dev(dev)); + if (!md) + return NULL; + + hc = dm_get_mdptr(md); + if (!hc) { + dm_put(md); + return NULL; + } + + return hc; +} + /*----------------------------------------------------------------- * Inserting, removing and renaming a device. *---------------------------------------------------------------*/ @@ -718,34 +736,23 @@ static int dev_create(struct dm_ioctl *param, size_t param_size) */ static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) { - struct mapped_device *md; struct hash_cell *hc = NULL; if (*param->uuid) { hc = __get_uuid_cell(param->uuid); if (!hc) return NULL; - goto fill_params; - } - - if (*param->name) { + } else if (*param->name) { hc = __get_name_cell(param->name); if (!hc) return NULL; - goto fill_params; - } - - md = dm_get_md(huge_decode_dev(param->dev)); - if (!md) - return NULL; - - hc = dm_get_mdptr(md); - if (!hc) { - dm_put(md); + } else if (param->dev) { + hc = __get_dev_cell(param->dev); + if (!hc) + return NULL; + } else return NULL; - } -fill_params: /* * Sneakily write in both the name and the uuid * while we have the cell. -- cgit v1.2.3-70-g09d2 From 759dea204cce9f1fc2a5d00ea25211299fc7a4a0 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Tue, 2 Aug 2011 12:32:06 +0100 Subject: dm ioctl: forbid multiple device specifiers Exactly one of name, uuid or device must be specified when referencing an existing device. This removes the ambiguity (risking the wrong device being updated) if two conflicting parameters were specified. Previously one parameter got used and any others were ignored silently. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/dm-ioctl.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/md/dm-ioctl.c') diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 4c350914f4a..2e9a3ca37bd 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -739,10 +739,16 @@ static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) struct hash_cell *hc = NULL; if (*param->uuid) { + if (*param->name || param->dev) + return NULL; + hc = __get_uuid_cell(param->uuid); if (!hc) return NULL; } else if (*param->name) { + if (param->dev) + return NULL; + hc = __get_name_cell(param->name); if (!hc) return NULL; -- cgit v1.2.3-70-g09d2