| Commit message (Collapse) | Author | Age | Files | Lines |
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Add a simple read-only counter to super_block that indicates how deep this
is in the stack of filesystems. Previously ecryptfs was the only stackable
filesystem and it explicitly disallowed multiple layers of itself.
Overlayfs, however, can be stacked recursively and also may be stacked
on top of ecryptfs or vice versa.
To limit the kernel stack usage we must limit the depth of the
filesystem stack. Initially the limit is set to 2.
Change-Id: I91549cf876ed11a4265487f6b2d980b459399f9d
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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actor is a constant in dir_context struct and
because of that we run into following build failure:
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fs/ecryptfs/file.c: In function ‘ecryptfs_readdir’:
fs/ecryptfs/file.c:130:2: error: assignment of read-only member ‘actor’
make[2]: *** [fs/ecryptfs/file.o] Error 1
make[1]: *** [fs/ecryptfs] Error 2
make: *** [fs] Error 2
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This fix is based on commit: b2497fc3057a([readdir] constify ->actor)
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Git-commit: 4be5c6a45a26cdfa7f6ad4a3c01cb69781f37535
Git-repo: https://android.googlesource.com/kernel/common.git
Signed-off-by: Ian Maund <imaund@codeaurora.org>
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iterate_dir(): new helper, replacing vfs_readdir().
struct dir_context: contains the readdir callback (and will get more stuff
in it), embedded into whatever data that callback wants to deal with;
eventually, we'll be passing it to ->readdir() replacement instead of
(data,filldir) pair.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Git-commit: c301a0e047e401d41b26db1009d08e088ae2365a
Git-repo: https://android.googlesource.com/kernel/common.git
Signed-off-by: Ian Maund <imaund@codeaurora.org>
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This prevents users from triggering a stack overflow through a recursive
invocation of pagefault handling that involves mapping procfs files into
virtual memory.
Signed-off-by: Jann Horn <jannh@google.com>
Acked-by: Tyler Hicks <tyhicks@canonical.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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