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This implements support for multi frame files while keeping
error checking for unexpected EOF working correctly. Files
with multiple frames are generated by pzstd, for example.
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This is a simplified variant of the code for xz, adapted to support
multiple digit integers.
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zstd is a compression algorithm developed by facebook. At level 19,
it is about 6% worse in size than xz -6, but decompression is multiple
times faster, saving about 40% install time, especially with eatmydata
on cloud instances.
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Commit 89c4c588b275 ("fix from David Kalnischkies for the InRelease gpg
verification code (LP: #784473)") amended verification of cleartext
signatures by a check whether the file to be verified actually starts
with "-----BEGIN PGP SIGNATURE-----\n".
However cleartext signed InRelease files have been found in the wild
which use \r\n as line ending for this armor header line, presumably
generated by a Windows PGP client. Such files are incorrectly deemed
unsigned and result in the following (misleading) error:
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
RFC 4880 specifies in 6.2 Forming ASCII Armor:
That is to say, there is always a line ending preceding the
starting five dashes, and following the ending five dashes. The
header lines, therefore, MUST start at the beginning of a line, and
MUST NOT have text other than whitespace following them on the same
line.
RFC 4880 does not seem to specify whether LF or CRLF is used as line
ending for armor headers, but CR is generally considered whitespace
(e.g. "man perlrecharclass"), hence using CRLF is legal even under
the assumption that LF must be used.
SplitClearSignedFile() is stripping whitespace (including CR) on lineend
already before matching the string, so StartsWithGPGClearTextSignature() is
adapted to use the same ignoring. As the earlier method is responsible
for what apt will end up actually parsing nowadays as signed/unsigned this
change has no implications for security.
Thanks: Lukas Wunner for detailed report & initial patch!
References: 89c4c588b275d098af33f36eeddea6fd75068342
Closes: 884922
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gcc was warning about ignored type qualifiers for all of them due to the
last 'const', so dropping that and converting to static_cast in the
process removes the here harmless warning to avoid hidden real issues in
them later on.
Reported-By: gcc
Gbp-Dch: Ignore
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The previous change moved running the proxy detection program from the
method to the main process, so it runs as root and not as _apt. This
brings it back into the sandbox.
Gbp-Dch: ignore
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Regression-Of: 3317ad864c997f4897756c0a2989c4199e9cda62
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We used to fail on unreadable config/preferences/sources files, but at
least for sources we didn't in the past and it seems harsh to refuse to
work because of a single file, especially as the error messages are
inconsistent and end up being silly (like suggesting to run apt update
to fix the problem…).
LP: #1701852
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Using different ways of opening files means we have different behaviour
and error messages for them, so by the same for all we can have more
uniformity for users and apt developers alike.
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This makes it easier to see which headers includes what.
The changes were done by running
git grep -l '#\s*include' \
| grep -E '.(cc|h)$' \
| xargs sed -i -E 's/(^\s*)#(\s*)include/\1#\2 include/'
To modify all include lines by adding a space, and then running
./git-clang-format.sh.
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The error cases are just as unlikely as the memory leaks to ever cause
real problems, but lets play it safe for correctness.
Reported-By: scan-build & clang
Gbp-Dch: Ignore
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POSIX.1-2008 gives us a range of *at calls to deal with files
including the unlinkat so we can remove a file from a directory
based on a path to the file relative to the directory.
(In our case here the path we have is just the filename)
We avoid changing directories in this way which e.g. fails if the
directory we started in no longer exists or is otherwise inaccessible.
Closes: 860738
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-1 is not an allowed value for the file descriptor, the only
allowed non-file-descriptor value is AT_FDCWD. So use that
instead.
AT_SYMLINK_NOFOLLOW has a weird semantic: It checks whether
we have the specified access on the symbolic link. It also
is implemented only by glibc on Linux, so it's inherently
non-portable. We should just drop it.
Thanks: James Clarke for debugging these issues
Reported-by: James Clarke <jrtc27@jrtc27.com>
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apt tools do not really support these other variables, but tools apt
calls might, so lets play save and clean those up as needed.
Reported-By: Paul Wise (pabs) on IRC
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We can't cleanup the environment like e.g. sudo would do as you usually
want the environment to "leak" into these helpers, but some variables
like HOME should really not have still the value of the root user – it
could confuse the helpers (USER) and HOME isn't accessible anyhow.
Closes: 842877
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This fixes a regression introduced in
commit 8f858d560e3b7b475c623c4e242d1edce246025a
don't leak FD in AutoProxyDetect command return parsing
which accidentally made the proxy autodetection code also read
the scripts output on stderr, not only on stdout when it switched
the code from popen() to Popen().
Reported-By: Tim Small <tim@seoss.co.uk>
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When checking if a file is empty, we forget to check that
fstat() actually worked.
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Socks support is a requested feature in sofar that the internet is
actually believing Acquire::socks::Proxy would exist. It doesn't and
this commit isn't adding it as that isn't how our configuration works,
but it allows Acquire::http::Proxy="socks5h://…". The HTTPS method was
changed already to support socks proxies (all versions) via curl. This
commit implements only SOCKS5 (RFC1928) with no auth or pass&user auth
(RFC1929), but not GSSAPI which is required by the RFC. The 'h' in the
protocol name further indicates that DNS resolution is delegated to the
socks proxy rather than performed locally.
The implementation works and was tested with Tor as socks proxy for
which implementing socks5h only can actually be considered a feature.
Closes: 744934
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There is no point in trying to perform Write/Read on a FileFd which
already failed as they aren't going to work as expected, so we should
make sure that they fail early on and hard.
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Reported-By: cppcheck
Gbp-Dch: Ignore
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The flush call is a no-op in most FileFd implementations so this isn't
as critical as it might sound as the only non-trivial implementation is
in the buffered writer, which tends not be used to buffer another
buffer…
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Very unlikely, but if the parent is /dev/null, the child empty and the
grandchild a value we returned /dev/null/value which doesn't exist, so
hardly a problem, but for best operability we should be consistent in
our work and return /dev/null always.
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If we have files in partial/ from a previous invocation or similar such
those could be symlinks created by file:// sources. The code is
expecting only real files through and happily changes owner,
modification times and permission on the file the symlink points to
which tend to be files we have no business in touching in this way.
Permissions of symlinks shouldn't be changed, changing owner is usually
pointless to, but just to be sure we pick the easy way out and use
lchown, check for symlinks before chmod/utimes.
Reported-By: Mattia Rizzolo on IRC
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If libapt has builtin support for a compression type it will create a
dummy compressor struct with the Binary set to 'false' as it will catch
these before using the generic pipe implementation which uses the
Binary. The catching happens based on configured Names through, so you
can actually force apt to use the external binaries even if it would
usually use the builtin support. That logic fails through if you don't
happen to have these external binaries installed as it will fallback to
calling 'false', which will end in confusing 'Write error's.
So, this is again something you only encounter in constructed testing.
Gbp-Dch: Ignore
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We deploy atomic renames for some files, but these renames also happen
if something about the file failed which isn't really the point of the
exercise…
Closes: 828908
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Seen first in #826783, but as this buglog also shows leaked uncompressed
files as well we don't close it just yet.
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This effects only compressors configured on the fly (rather then the
inbuilt ones as they use a library).
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If the file is in a failed state there is no point in trying to flush
out the buffers as the file is to be discarded anyhow & its likely all
this flushing is producing is additional error messages.
Git-Dch: Ignore
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Some methods had it missing, some used the keyword directly, which isn't
a problem as it is a cc file, but for consistency lets stick to our
macro for now.
Git-Dch: Ignore
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The liblzma-based write code needs the same tweaks that the read code
already has to cope with the situation where lzma_code returns zero the
first time through because avail_out is zero, but will do more work if
called again.
This ports the read tweaks to the write code as closely as possible
(including matching comments etc.).
Closes: #751688
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If we just reopened the file, we also need to reset the current
seek position when we reset the buffer, otherwise the code will
not try to seek to the position given to Skip (from 0), but will
try to seek to old offset + the position given to skip.
Closes: #812994, #813000
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When writing into the buffer write to free() bytes starting
at getend(), instead of buffersize_max bytes at get()
-> get() is a read pointer.
This makes no difference in practice though, as we reset
the buffer before the call, so start = end = 0.
Gbp-Dch: ignore
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We cannot just return false without setting an error,
as InternalWrite does not set one itself.
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It makes no sense to split a large block into multiple small
blocks, so when we have the chance to write them unbuffered,
do so.
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We do not need the loop, FileFd::Private() handles this for us.
Gbp-Dch: ignore
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We want to check whether the amount of free space is smaller
than the requested write size. Checking maxsize - size() is
incorrect for bufferstart >= 0, as size() = end - start.
Gbp-Dch: ignore
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This is a multiple of the page size and thus results in less
page faults, speeding up copying.
Also, while we're at at, unify all uses of that size in a
constant variable APT_BUFFER_SIZE.
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Implement native support for LZ4 compression, using the official
lz4 library.
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This makes code easier to read, and somewhat more correct.
Gbp-Dch: ignore
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Gbp-Dch: ignore
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Previously, if flush errored inside the loop, data could have
already been written to the wrapped descriptor without having
been removed from the buffer.
Also try to work around EINTR here. A better solution might be
to have the individual privates detect an interrupt and return
0 in such a case, instead of relying on errno being untouched
in between the syscall and the return from InternalWrite.
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This avoids some issues with InternalWrite returning 0 because
it just cannot write stuff at the moment.
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This is somewhat experimental right now, and might not work
for everyone, so it is on an opt-in basis.
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The flush function can be used for buffered writers.
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We will soon implement a buffered writing decorator and we will
need to forward attribute changes to those.
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These can be used to implement write buffering
Gbp-Dch: ignore
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Suggested by David.
Gbp-Dch: ignore
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Gbp-Dch: ignore
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There is not much point and this is more readable.
Gbp-Dch: ignore
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