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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-12 14:06:34 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-12 14:47:58 -0800
commit974a9f0b47da74e28f68b9c8645c3786aa5ace1a (patch)
tree79f1aaba6998830be0d11bf7a2258529584b35c3 /fs/namei.c
parentd0c4c9d4a2e46f052178806c4004d52cd3ae040f (diff)
downloadlwn-974a9f0b47da74e28f68b9c8645c3786aa5ace1a.tar.gz
lwn-974a9f0b47da74e28f68b9c8645c3786aa5ace1a.zip
Use access mode instead of open flags to determine needed permissions
Way back when (in commit 834f2a4a1554dc5b2598038b3fe8703defcbe467, aka "VFS: Allow the filesystem to return a full file pointer on open intent" to be exact), Trond changed the open logic to keep track of the original flags to a file open, in order to pass down the the intent of a dentry lookup to the low-level filesystem. However, when doing that reorganization, it changed the meaning of namei_flags, and thus inadvertently changed the test of access mode for directories (and RO filesystem) to use the wrong flag. So fix those test back to use access mode ("acc_mode") rather than the open flag ("flag"). Issue noticed by Bill Roman at Datalight. Reported-and-tested-by: Bill Roman <bill.roman@datalight.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 3b993db26cee..73e2e665817a 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1605,7 +1605,7 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
if (S_ISLNK(inode->i_mode))
return -ELOOP;
- if (S_ISDIR(inode->i_mode) && (flag & FMODE_WRITE))
+ if (S_ISDIR(inode->i_mode) && (acc_mode & MAY_WRITE))
return -EISDIR;
/*
@@ -1620,7 +1620,7 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
return -EACCES;
flag &= ~O_TRUNC;
- } else if (IS_RDONLY(inode) && (flag & FMODE_WRITE))
+ } else if (IS_RDONLY(inode) && (acc_mode & MAY_WRITE))
return -EROFS;
error = vfs_permission(nd, acc_mode);