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authorJan Kara <jack@suse.cz>2010-10-20 22:17:28 +0200
committerJan Kara <jack@suse.cz>2011-01-06 17:03:55 +0100
commitc03cad241af63445b751781a09faf08b3a5b77c1 (patch)
tree2e6f329259d442c23829c218a21977bbd6a5d248
parent949f4a7c08bc4a050eae7aeeac3e6d019d1feafb (diff)
downloadlinux-c03cad241af63445b751781a09faf08b3a5b77c1.tar.bz2
udf: Protect default inode credentials by rwlock
Superblock carries credentials (uid, gid, etc.) which are used as default values in __udf_read_inode() when media does not provide these. These credentials can change during remount so we protect them by a rwlock so that each inode gets a consistent set of credentials. Signed-off-by: Jan Kara <jack@suse.cz>
-rw-r--r--fs/udf/inode.c16
-rw-r--r--fs/udf/super.c3
-rw-r--r--fs/udf/udf_sb.h2
3 files changed, 14 insertions, 7 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 9656907f4b81..fa3c1541151c 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1201,6 +1201,7 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
return;
}
+ read_lock(&sbi->s_cred_lock);
inode->i_uid = le32_to_cpu(fe->uid);
if (inode->i_uid == -1 ||
UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
@@ -1213,13 +1214,6 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
- inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
- if (!inode->i_nlink)
- inode->i_nlink = 1;
-
- inode->i_size = le64_to_cpu(fe->informationLength);
- iinfo->i_lenExtents = inode->i_size;
-
if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
sbi->s_fmode != UDF_INVALID_MODE)
inode->i_mode = sbi->s_fmode;
@@ -1229,6 +1223,14 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
else
inode->i_mode = udf_convert_permissions(fe);
inode->i_mode &= ~sbi->s_umask;
+ read_unlock(&sbi->s_cred_lock);
+
+ inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
+ if (!inode->i_nlink)
+ inode->i_nlink = 1;
+
+ inode->i_size = le64_to_cpu(fe->informationLength);
+ iinfo->i_lenExtents = inode->i_size;
if (iinfo->i_efe == 0) {
inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
diff --git a/fs/udf/super.c b/fs/udf/super.c
index e54960c0e960..f06cc67cf864 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -568,12 +568,14 @@ static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
return -EINVAL;
lock_kernel();
+ write_lock(&sbi->s_cred_lock);
sbi->s_flags = uopt.flags;
sbi->s_uid = uopt.uid;
sbi->s_gid = uopt.gid;
sbi->s_umask = uopt.umask;
sbi->s_fmode = uopt.fmode;
sbi->s_dmode = uopt.dmode;
+ write_unlock(&sbi->s_cred_lock);
if (sbi->s_lvid_bh) {
int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
@@ -1960,6 +1962,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
sbi->s_fmode = uopt.fmode;
sbi->s_dmode = uopt.dmode;
sbi->s_nls_map = uopt.nls_map;
+ rwlock_init(&sbi->s_cred_lock);
if (uopt.session == 0xFFFFFFFF)
sbi->s_session = udf_get_last_session(sb);
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index 9f38a6ca4fd5..4858c191242b 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -129,6 +129,8 @@ struct udf_sb_info {
uid_t s_uid;
mode_t s_fmode;
mode_t s_dmode;
+ /* Lock protecting consistency of above permission settings */
+ rwlock_t s_cred_lock;
/* Root Info */
struct timespec s_record_time;