diff options
| -rw-r--r-- | Documentation/filesystems/mount_api.rst | 9 | ||||
| -rw-r--r-- | fs/fs_parser.c | 34 | ||||
| -rw-r--r-- | include/linux/fs_parser.h | 6 |
3 files changed, 46 insertions, 3 deletions
diff --git a/Documentation/filesystems/mount_api.rst b/Documentation/filesystems/mount_api.rst index 9aaf6ef75eb5..317934c9e8fc 100644 --- a/Documentation/filesystems/mount_api.rst +++ b/Documentation/filesystems/mount_api.rst @@ -645,6 +645,8 @@ The members are as follows: fs_param_is_blockdev Blockdev path * Needs lookup fs_param_is_path Path * Needs lookup fs_param_is_fd File descriptor result->int_32 + fs_param_is_uid User ID (u32) result->uid + fs_param_is_gid Group ID (u32) result->gid ======================= ======================= ===================== Note that if the value is of fs_param_is_bool type, fs_parse() will try @@ -678,6 +680,8 @@ The members are as follows: fsparam_bdev() fs_param_is_blockdev fsparam_path() fs_param_is_path fsparam_fd() fs_param_is_fd + fsparam_uid() fs_param_is_uid + fsparam_gid() fs_param_is_gid ======================= =============================================== all of which take two arguments, name string and option number - for @@ -784,8 +788,9 @@ process the parameters it is given. option number (which it returns). If successful, and if the parameter type indicates the result is a - boolean, integer or enum type, the value is converted by this function and - the result stored in result->{boolean,int_32,uint_32,uint_64}. + boolean, integer, enum, uid, or gid type, the value is converted by this + function and the result stored in + result->{boolean,int_32,uint_32,uint_64,uid,gid}. If a match isn't initially made, the key is prefixed with "no" and no value is present then an attempt will be made to look up the key with the diff --git a/fs/fs_parser.c b/fs/fs_parser.c index a4d6ca0b8971..24727ec34e5a 100644 --- a/fs/fs_parser.c +++ b/fs/fs_parser.c @@ -308,6 +308,40 @@ int fs_param_is_fd(struct p_log *log, const struct fs_parameter_spec *p, } EXPORT_SYMBOL(fs_param_is_fd); +int fs_param_is_uid(struct p_log *log, const struct fs_parameter_spec *p, + struct fs_parameter *param, struct fs_parse_result *result) +{ + kuid_t uid; + + if (fs_param_is_u32(log, p, param, result) != 0) + return fs_param_bad_value(log, param); + + uid = make_kuid(current_user_ns(), result->uint_32); + if (!uid_valid(uid)) + return inval_plog(log, "Invalid uid '%s'", param->string); + + result->uid = uid; + return 0; +} +EXPORT_SYMBOL(fs_param_is_uid); + +int fs_param_is_gid(struct p_log *log, const struct fs_parameter_spec *p, + struct fs_parameter *param, struct fs_parse_result *result) +{ + kgid_t gid; + + if (fs_param_is_u32(log, p, param, result) != 0) + return fs_param_bad_value(log, param); + + gid = make_kgid(current_user_ns(), result->uint_32); + if (!gid_valid(gid)) + return inval_plog(log, "Invalid gid '%s'", param->string); + + result->gid = gid; + return 0; +} +EXPORT_SYMBOL(fs_param_is_gid); + int fs_param_is_blockdev(struct p_log *log, const struct fs_parameter_spec *p, struct fs_parameter *param, struct fs_parse_result *result) { diff --git a/include/linux/fs_parser.h b/include/linux/fs_parser.h index d3350979115f..6cf713a7e6c6 100644 --- a/include/linux/fs_parser.h +++ b/include/linux/fs_parser.h @@ -28,7 +28,7 @@ typedef int fs_param_type(struct p_log *, */ fs_param_type fs_param_is_bool, fs_param_is_u32, fs_param_is_s32, fs_param_is_u64, fs_param_is_enum, fs_param_is_string, fs_param_is_blob, fs_param_is_blockdev, - fs_param_is_path, fs_param_is_fd; + fs_param_is_path, fs_param_is_fd, fs_param_is_uid, fs_param_is_gid; /* * Specification of the type of value a parameter wants. @@ -57,6 +57,8 @@ struct fs_parse_result { int int_32; /* For spec_s32/spec_enum */ unsigned int uint_32; /* For spec_u32{,_octal,_hex}/spec_enum */ u64 uint_64; /* For spec_u64 */ + kuid_t uid; + kgid_t gid; }; }; @@ -131,6 +133,8 @@ static inline bool fs_validate_description(const char *name, #define fsparam_bdev(NAME, OPT) __fsparam(fs_param_is_blockdev, NAME, OPT, 0, NULL) #define fsparam_path(NAME, OPT) __fsparam(fs_param_is_path, NAME, OPT, 0, NULL) #define fsparam_fd(NAME, OPT) __fsparam(fs_param_is_fd, NAME, OPT, 0, NULL) +#define fsparam_uid(NAME, OPT) __fsparam(fs_param_is_uid, NAME, OPT, 0, NULL) +#define fsparam_gid(NAME, OPT) __fsparam(fs_param_is_gid, NAME, OPT, 0, NULL) /* String parameter that allows empty argument */ #define fsparam_string_empty(NAME, OPT) \ |