linux-stable.git/fs/fhandle.c, branch v3.2.78 Linux kernel stable tree vfs: read file_handle only once in handle_to_path 2015-08-06T23:32:14+00:00 Sasha Levin sasha.levin@oracle.com 2015-01-28T20:30:43+00:00 8dfc8b9e8432f50606820b40a7d63618d9d61a07 commit 161f873b89136eb1e69477c847d5a5033239d9ba upstream. We used to read file_handle twice. Once to get the amount of extra bytes, and once to fetch the entire structure. This may be problematic since we do size verifications only after the first read, so if the number of extra bytes changes in userspace between the first and second calls, we'll have an incoherent view of file_handle. Instead, read the constant size once, and copy that over to the final structure without having to re-read it again. Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> 
commit 161f873b89136eb1e69477c847d5a5033239d9ba upstream.

We used to read file_handle twice.  Once to get the amount of extra
bytes, and once to fetch the entire structure.

This may be problematic since we do size verifications only after the
first read, so if the number of extra bytes changes in userspace between
the first and second calls, we'll have an incoherent view of
file_handle.

Instead, read the constant size once, and copy that over to the final
structure without having to re-read it again.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
fs/fhandle.c: add <linux/personality.h> for ia64 2011-04-14T23:06:56+00:00 Jeff Mahoney jeffm@suse.com 2011-04-14T22:22:16+00:00 ed5afeaf422202485bbebc7e911f13b2a6be2666 force_o_largefile() on ia64 is defined in <asm/fcntl.h> and requires <linux/personality.h>. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 
force_o_largefile() on ia64 is defined in <asm/fcntl.h> and requires
<linux/personality.h>.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
vfs: Add open by file handle support 2011-03-15T06:21:44+00:00 Aneesh Kumar K.V aneesh.kumar@linux.vnet.ibm.com 2011-01-29T13:13:26+00:00 becfd1f37544798cbdfd788f32c827160fab98c1 [AV: duplicate of open() guts removed; file_open_root() used instead] Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
[AV: duplicate of open() guts removed; file_open_root() used instead]

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
vfs: Add name to file handle conversion support 2011-03-15T06:21:37+00:00 Aneesh Kumar K.V aneesh.kumar@linux.vnet.ibm.com 2011-01-29T13:13:26+00:00 990d6c2d7aee921e3bce22b2d6a750fd552262be The syscall also return mount id which can be used to lookup file system specific information such as uuid in /proc/<pid>/mountinfo Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 
The syscall also return mount id which can be used
to lookup file system specific information such as uuid
in /proc/<pid>/mountinfo

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>