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When statting a file that we may or may not be opening with O_NOFOLLOW,
we should use lstat (or AT_SYMLINK_NOFOLLOW) to try to get information
about the right file.
Also when we want to check whether a bit is set, we should use & rather
than |. I am an experienced programmer and know the difference between
those.
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Did you know that, similar to AT_SYMLINK_NOFOLLOW, there's
an O_NOFOLLOW available in flags for open/openat?
I didn't.
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So renameat2 now has a glibc wrapper in some recent glibc, which
means that mv can use it, and thus bypass all our clever testing,
and since we can't intercept the actual syscall (gnulib's implementation
apparently doesn't hit the glibc syscall() wrapper?), this results
in files being moved without pseudo knowing about them.
Implementing the semantics properly is Very Hard, but possibly we
can just fail politely for now.
We'll be back to this later.
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openat() was passing its flags unaltered to pseudo_root_path(), which
assumes that a flags argument other than 0 means "don't follow symlinks
in last path component". This is completely wrong, and I have no idea
how it survived this long unnoticed.
Now, if a plain flags variable is set and not overruled by a
comment like /* flags=... */, it's masked with AT_SYMLINK_NOFOLLOW,
as there are other values fstatat() and friends can take, and the
openat() flags are just overridden with 0. (The only meaningful case
would be O_NOFOLLOW, but O_NOFOLLOW instructs us to *fail* in the
open if the path is a symlink, so we don't care.)
Signed-off-by: Seebs <seebs@seebs.net>
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This wrapper should allow us to reject renameat2 attempts by
coreutils, letting us regain functionality on FC27 and related
systems.
This is not safe/portable/etc even by pseudo's standards, and
arguably it should be a separate and optional port.
[Amended commit: Don't include the dodgy renameat2 wrapper
which it turns out we'd never hit anyway.]
Signed-off-by: Seebs <seebs@seebs.net>
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file. Before setting a file's capabilities with cap_set_file() (which uses
setxattr()) it calls cap_set_flag(mycaps, CAP_EFFECTIVE, 1, &capflag,
CAP_SET). cap_set_flag() uses the capset syscall to raise the process'
effective capability. In most cases if the process isn't running as root
this will fail and setcap will exit with an error. Because setxattr is
intercepted by pseudo it's unnecessary for setcap to call capset().
Override capset with a pseudo function that does nothing and always
returns 0.
Signed-off-by: George McCollister <george.mccollister at gmail.com>
Signed-off-by: Seebs <seebs@seebs.net>
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So a recent change to ld.so behavior revealed that pseudo was not
always correctly detecting that a function hadn't been found by the
RTLD_NEXT search. This only happened for functions which genuinely
didn't exist and wouldn't get called (like mknod on Linux, which
is actually always done as an inline function that calls __xmknod),
but when the diagnostics started showing up, it broke things. Fix it
so the diagnostics would have shown up when things were originally
broken, also fix the resulting diagnostics.
Signed-off-by: Peter Seebach <peter.seebach@windriver.com>
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Also for lstat, but that probably never matters because in Linux
you will never actually call lstat without working really hard at
it, because you end up calling __lxstat anyway. (Was already
doing the right thing for Darwin.)
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Initial, incomplete, support for extended attributes. Extended
attributes are implemented fairly naively, using a second table
in the file database using the primary file table's id as a
foreign key. The ON DELETE CASCADE behavior requires sqlite 3.6.19
or later with foreign key and trigger support compiled in.
To reduce round-trips, the client does not check for existing
attributes, but rather, sends three distinct set messages;
OP_SET_XATTR, OP_CREATE_XATTR, OP_REPLACE_XATTR. A SET message
always succeeds, a CREATE fails if the attribute already
exists, and a REPLACE fails if the attribute does not already
exist.
The /* flags */ feature of makewrappers is used to correct
path names appropriately, so all functions are already working
with complete paths, and can always use functions that work
on links; if they were supposed to dereference, the path
fixup code got that.
The xattr support is enabled, for now, conditional on
whether getfattr --help succeeds.
Not yet implemented: Translation for system.posix_acl_access,
which is used by "cp -a" (or "cp --preserve-all") on some
systems to try to copy modes.
Signed-off-by: Peter Seebach <peter.seebach@windriver.com>
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The PSEUDO_STATBUF change (allowing operations on files over
2GB even on 32-bit systems) introduced a subtle bug; by calling
stat64() rather than real_stat(), pseudo stopped handling
chrooted paths well. In most cases, this was fine, but in the
specific case of a rename, where the stat buffers for the various
parts were actually used, it wasn't. Of particular note, pseudo
could end up creating links which had stack garbage for their
stat buffs, because it assumed that if the rename operation
succeeded, the stat operations must have succeeded.
Of course, there is no real_stat64 in the Linux port, because
there's no need for it; most code is calling __xstat64 or some
relative thereof, and even if you did really call stat64, it'd
end up routed there anyway. So we add that so that it can be
used for calls and we don't have to encode Linux-specific
magic about __xstat into the generic header.
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This is a spiffied-up rebase of a bunch of intermediate changes, presented
as a whole because it is, surprisingly, less confusing that way. The basic
idea is to separate the guts code into categories ranging from generic
stuff that can be the same everywhere and specific variants. The big scary
one is the Darwin support, which actually seems to run okay on 64-bit OS X
10.6. (No other variants were tested.) The other example given is support
for the old clone() syscall on RHEL 4, which affects some wrlinux use cases.
There's a few minor cleanup bits here, such as a function with inconsistent
calling conventions, but nothing really exciting.
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Seebs
Peter Seebach