linux-stable.git/fs/xattr.c, branch linux-4.2.y

evm: fix potential race when removing xattrs

2015-05-21T17:28:47+00:00

EVM needs to be atomically updated when removing xattrs.
Otherwise concurrent EVM verification may fail in between.
This patch fixes by moving i_mutex unlocking after calling
EVM hook. fsnotify_xattr() is also now called while locked
the same way as it is done in __vfs_setxattr_noperm.

Changelog:
- remove unused 'inode' variable.

Signed-off-by: Dmitry Kasatkin 
Signed-off-by: Mimi Zohar

new helper: audit_file()

2014-11-19T18:01:26+00:00

... for situations when we don't have any candidate in pathnames - basically,
in descriptor-based syscalls.

[Folded the build fix for !CONFIG_AUDITSYSCALL configs from Chen Gang]

Signed-off-by: Al Viro

vfs: Deduplicate code shared by xattr system calls operating on paths

2014-10-12T21:09:10+00:00

The following pairs of system calls dealing with extended attributes only
differ in their behavior on whether the symbolic link is followed (when
the named file is a symbolic link):

- setxattr() and lsetxattr()
- getxattr() and lgetxattr()
- listxattr() and llistxattr()
- removexattr() and lremovexattr()

Despite this, the implementations all had duplicated code, so this commit
redirects each of the above pairs of system calls to a corresponding
function to which different lookup flags (LOOKUP_FOLLOW or 0) are passed.

For me this reduced the stripped size of xattr.o from 8824 to 8248 bytes.

Signed-off-by: Eric Biggers 
Signed-off-by: Al Viro

simple_xattr: permit 0-size extended attributes

2014-07-23T22:10:55+00:00

If a filesystem uses simple_xattr to support user extended attributes,
LTP setxattr01 and xfstests generic/062 fail with "Cannot allocate
memory": simple_xattr_alloc()'s wrap-around test mistakenly excludes
values of zero size.  Fix that off-by-one (but apparently no filesystem
needs them yet).

Signed-off-by: Hugh Dickins 
Cc: Al Viro 
Cc: Jeff Layton 
Cc: Aristeu Rozanski 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

vfs: make lremovexattr retry once on ESTALE error

2012-12-20T23:50:11+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

vfs: make removexattr retry once on ESTALE

2012-12-20T23:50:10+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

vfs: make llistxattr retry once on ESTALE error

2012-12-20T23:50:10+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

vfs: make listxattr retry once on ESTALE error

2012-12-20T23:50:10+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

vfs: make lgetxattr retry once on ESTALE

2012-12-20T23:50:09+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

vfs: make getxattr retry once on an ESTALE error

2012-12-20T23:50:09+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro