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People have been asking for a feature to error out on transient network
errors for a while, this gives them one while keeping the door open for
other modes we need, such as --error-on=no-success which we need to
determine when to retry the daily update job.
Closes: #594813
(and a whole bunch of duplicates...)
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This adds support for Phased-Update-Percentage by pinning
upgrades that are not to be installed down to 1.
The output of policy has been changed to add the level of
phasing, and documentation has been improved to document
how phased updates work.
The patch detects if it is running in a chroot, and if so, always
includes phased updates, restoring classic apt behavior to avoid
behavioral changes on buildd chroots.
Various options are added to control this all:
* APT::Get::{Always,Never}-Include-Phased-Updates and their legacy
update-manager equivalents to always or never include phased updates
* APT::Machine-ID can be set to a UUID string to have all machines in a
fleet phase the same
* Dir::Etc::Machine-ID is weird in that it's default is sort of like
../machine-id, but not really, as ../machine-id would look up
$PWD/../machine-id and not relative to Dir::Etc; but it allows you to
override the path to machine-id (as opposed to the value)
* Dir::Bin::ischroot is the path to the ischroot(1) binary which is used
to detect whether we are running in a chroot.
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Be compatible with Bash
See merge request apt-team/apt!142
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Our kernel autoremoval helper script protects the currently booted
kernel, but it only runs whenever we install or remove a kernel,
causing it to protect the kernel that was booted at that point in time,
which is not necessarily the same kernel as the one that is running
right now.
Reimplement the logic in C++ such that we can calculate it at run-time:
Provide a function to produce a regular expression that matches all
kernels that need protecting, and by changing the default root set
function in the DepCache to make use of that expression.
Note that the code groups the kernels by versions as before, and then
marks all kernel packages with the same version.
This optimized version inserts a virtual package $kernel into the cache
when building it to avoid having to iterate over all packages in the
cache to find the installed ones, significantly improving performance at
a minor cost when building the cache.
LP: #1615381
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On many distributions, /bin/sh is Bash. Bash’s `echo` builtin doesn’t
interpret escape sequences, so most tests fail. Fix this by removing
the escape sequence.
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Every method opts in to getting the encoded URI passed along while
keeping compat in case we are operated by an older acquire system.
Effectively this is just a change for the http-based methods as the
others just decode the URI as they work with files directly.
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We do not deal a lot with URIs which need encoding, but then we do it is
a pain that we store it decoded in the acquire system as it means we
have to decode and reencode URIs eventually which is potentially giving
us slightly different URIs.
We see that in our own testing framework while setting up redirects as
the config options are effectively double-encoded and decoded to pass
them around successfully as otherwise %2f and / in an URI are treated
the same.
This commit adds the infrastructure for methods to opt into getting URIs
send in encoded form (and returning them to us in encoded form, too) so
that we eventually do not have to touch the URIs which is how it should
be. This means though that we have to deal with methods who do not
support this yet (aka: all at the moment) for which we decode and encode
while communicating with them.
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Our http method encodes the URI again which results in the double
encoding we have unwrap in the webserver (we did already, but we skip
the filename handling now which does the first decode).
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The integer overflow was detected by DonKult who added a check like this:
(std::numeric_limits<decltype(Itm.Size)>::max() - (2 * sizeof(Block)))
Which deals with the code as is, but also still is a fairly big limit,
and could become fragile if we change the code. Let's limit our file
sizes to 128 GiB, which should be sufficient for everyone.
Original comment by DonKult:
The code assumes that it can add sizeof(Block)-1 to the size of the item
later on, but if we are close to a 64bit overflow this is not possible.
Fixing this seems too complex compared to just ensuring there is enough
room left given that we will have a lot more problems the moment we will
be acting on files that large as if the item is that large, the (valid)
tar including it probably doesn't fit in 64bit either.
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Like the code in arfile.cc, MemControlExtract also has buffer
overflows, in code allocating memory for parsing control files.
Specify an upper limit of 64 MiB for control files to both protect
against the Size overflowing (we allocate Size + 2 bytes), and
protect a bit against control files consisting only of zeroes.
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Tarballs have long names and long link targets structured by a
special tar header with a GNU extension followed by the actual
content (padded to 512 bytes). Essentially, think of a name as
a special kind of file.
The limit of a file size in a header is 12 bytes, aka 10**12
or 1 TB. While this works OK-ish for file content that we stream
to extractors, we need to copy file names into memory, and this
opens us up to an OOM DoS attack.
Limit the file name size to 1 MiB, as libarchive does, to make
things safer.
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GHSL-2020-169: This first hunk adds a check that we have more files
left to read in the file than the size of the member, ensuring that
(a) the number is not negative, which caused the crash here and (b)
ensures that we similarly avoid other issues with trying to read too
much data.
GHSL-2020-168: Long file names are encoded by a special marker in
the filename and then the real filename is part of what is normally
the data. We did not check that the length of the file name is within
the length of the member, which means that we got a overflow later
when subtracting the length from the member size to get the remaining
member size.
The file createdeb-lp1899193.cc was provided by GitHub Security Lab
and reformatted using apt coding style for inclusion in the test
case, both of these issues have an automated test case in
test/integration/test-ubuntu-bug-1899193-security-issues.
LP: #1899193
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Fixes lookup in as-installed testing
Gbp-Dch: ignore
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Enhance rred for possible external usage
See merge request apt-team/apt!136
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The acquire system mode does this for a long time already and as it is
easy to implement and handy for manual testing as well we can support
it in the other modes, too.
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Merging patches is a bit of non-trivial code we have for client-side
work, but as we support also server-side merging we can export this
functionality so that server software can reuse it.
Note that this just cleans up and makes rred behave a bit more like all
our other binaries by supporting setting configuration at runtime and
supporting --help and --version. If you can make due without this, the
now advertised functionality is provided already in earlier versions.
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In LP#835625, it was reported that apt did not unpack multi-arch
packages in the correct order, and dpkg did not like that. The fix
also made apt configure packages together, which is not strictly
necessary.
This turned out to cause issues now, because of dependencies on
libc6:i386 that caused immediate configuration of that to not
work.
Work around the issue by not configuring multi-arch: same packages
in lockstep if they have the immediate flag set. This will be the
pseudo-essential set, and given how essential works, we mostly need
the native arch to work correctly anyway.
LP: #1871268
Regression-Of: 30426f4822516bdd26528aa2e6d8d69c1291c8d3
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We accidentally excluded virtual packages by excluding every
group that had a package, but where the package had no versions.
Rewrite the code so the lookup consistently uses VersionList()
instead of FirstVersion and FindPkg("any") - those are all the
same, and this is easier to read.
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We passed "false" instead of false, and that apparently got
cast to bool, because it's a non-null pointer.
LP: #1876495
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Closes: #931566
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dpkg (>= 1.20.3) has better support for its own DPKG_ROOT resulting in
architectures for the root being reported rather than the host system.
Sadly the hookscript from pkg-config is not prepared for this resulting
in our `dpkg --add-architecture` calls failing in the hook after dpkg
has successfully added the architecture internally. The failure
triggered fallback handling in the tests to work with an older version
of dpkg with a different multi-arch implementation.
So instead of doing the fallback, we ignore the failure if it seems like
pkg-config-dpkghook is involved only producing a bunch of warnings
to hint at this problem, but otherwise make the tests work again as it
is a post-invoke script.
References: #824774
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The test runs ls on the opened fds and greps the result for 'root root'
which is how ls (<= 8.30) used to report user and group for these. Now
that Debian contains 8.32 it reports user and group of the process
owning them (supposedly). grepping for both unbreaks the test.
lr-x------ 1 root root 64 Jul 7 19:07 0 -> 'pipe:[10458045]'
lrwx------ 1 root root 64 Jul 7 19:07 1 -> /dev/pts/12
lrwx------ 1 root root 64 Jul 7 19:07 2 -> /dev/pts/12
lr-x------ 1 root root 64 Jul 7 19:07 3 -> /proc/1266484/fd
vs (assuming user:group is david:david)
lr-x------ 1 david david 64 Jul 7 19:07 0 -> 'pipe:[10458045]'
lrwx------ 1 david david 64 Jul 7 19:07 1 -> /dev/pts/12
lrwx------ 1 david david 64 Jul 7 19:07 2 -> /dev/pts/12
lr-x------ 1 david david 64 Jul 7 19:07 3 -> /proc/1266484/fd
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We were traditionally adding points for some dependency types to the
real package, but we should also do it for providers of that package to
help the resolver especially if the real package is for some reason not
tagged for removal yet/anymore.
While at it we ensure that the points are only attributed once for each
package as especially with versioned provides a package can nowadays
provide another many times and would hence acquire a lot of points.
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If the package providing the given solution is tagged already for
removal (or at least for "not installing") we can ignore this solution
as a possibility as it is not one, which means we can avoid exploring
the option and potentially forward the protected flag further if that
helps in reducing the possibilities to a single one.
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Marking a package for removal is fine if we know that we have to remove
that package, but if we are in an alternative branch we might not go
this route in the end and hence have a package pointlessly marked for
removal which isn't questioned later on.
We check if we are allowed to remove that package to avoid working on
the positive dependencies if not, but we mark them for removal only
after all the other dependencies are successfully resolved.
In an ideal world we would let the problemResolver do its job on them,
but the resolver might decide against doing the removal exploring
another option like the next alternative, which might be a good idea,
but is not the behaviour we had before, so that is the best we can do
for now without changing the resolver drastically.
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This will be mapped to Important for the time being.
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M-A:foreign causes Provides to apply to all architectures and as we
wanted to avoid resolver changes for M-A those are done by explicitly
creating these provides instead of forcing the resolvers to learn about
this. The EDSP is a different beast though & we don't need this trick
here especially as it leads to needless (but harmless) duplication.
No sort+unique is done to avoid changing order (not that it should
matter, but just to be sure), but the sets should be small enough to not
make a huge difference either way.
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We usually tell EDSP solvers only about architectures we are configured
to treat as native/foreign, but the system could have packages from
other architectures installed (even if very unlikely) which could
influence the solution (e.g. requiring a removal) so we make sure to
tell them.
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If package is installed via an explicitly given deb file we store the
filename as a provides, so that the frontend can request the filename
and get the usual "Selected foo instead of foo.deb" message.
We do not need to trouble the EDSP solvers with that though as these
provides are not valid in various ways and we have already solved the
link between commandline and package (and version) for them.
Closes: #962741
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While we process the possible solutions we might modify other solutions
like discarding their candidates and such, so that then we reach them
they might no longer be proper candidates. We also try to drop
duplicates early on to avoid the simple cases of these which
test-explore-or-groups-in-markinstall triggers via its explicit
duplication but could also come via multiple provides.
It only worked previously as were ignoring current versions which
usually is okay expect if they are marked for removal and we want to
reinstate them so the ProblemResolver can decide which one later on.
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For protected packages the "Fixing" done via KillList in the
ProblemResolver will usually not happen as the state change is not
allowed, so the debug message is just confusing and the resolver is
needlessly looping here (which might push it over the edge), so if we
didn't do our thing successfully here we short-circuit a bit to help the
next iteration come to a solution.
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The pkgProblemResolver incorrectly skips protected packages while
considering packages for removal, which was always wrong but is now a
lot more visible as (potentially) far more packages are considered
protected in their state.
Note that the testcase shows that we need more changes to make this
proper.
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It looks like hack and therefore I wanted this to be a very isolated
commit so we can find it & revert it easily if need be, but for now it
seems to work.
The idea is that Status is telling us how the candidate is in relation
to the current installed version which is used to figure out if a
package is "kept back" by the algorithm or not, but by discarding the
candidate version we loose this information.
Ideally we would keep better tabs on what we do to a package and why,
but for now that seems okayish. It will cause the wrong version to be
displayed though as if the package is installed the installed version
becomes the candidate and hence (installed => installed) is displayed.
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For a (partially) installed package like the one MarkInstall operates on
at the moment we want to discard the candidate from, we have to first
remove the package from the internal state keeping to have proper broken
counts and such and only then reset the candidate version which is a
trivial operation in comparison.
Take a look at the testcase: Now, what is the problem? Correct,
git:i386. Didn't see that coming, right? It is M-A:foreign so apt tries
to switch the architecture of git here (which is pointless, it knows
that this won't work, but lets fix that in another commit) will
eventually realize that it can't install it and wants to discard the
candidate of git:i386 first removing the broken indication like it
should, removing the install flag and then reapplies the broken
indication: Expect it doesn't as it wants to do that over the candidate
version which the package no longer had so seemingly nothing is broken.
It is a bit of a hairball to figure out which commit it is exactly that
is wrong here as they are all influencing each other a bit, but >= 2.1
is an acceptable ballpark. Bisect says 57df273 but that is mostly a lie.
Closes: #961266
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References: dcdfb4723a9969b443d1c823d735e192c731df69
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Turns out that pkgDepCache and pkgProblemResolver maintain two (semi)
independent sets of protected flags – except that a package if marked
protected in the pkgProblemResolver is automatically also marked in the
pkgDepCache as protected. This way the pkgProblemResolver will have as
protected only the direct user requests while pkgDepCache will
(hopefully) propagate the flag to unavoidable dependencies of these
requests nowadays. The pkgProblemResolver was only checking his own
protected flag though and based on that calls our Mark* methods usually
without checking return, leading to it believing it could e.g. remove
packages it actually can't remove as pkgDepCache will not allow it as it
is marked as protected there. Teaching it to check for the flag in the
pkgDepCache instead avoids it believing in the wrong things eventually
giving up.
The scoring is keeping the behaviour of adding the large score boost
only for the direct user requests though as there is no telling which
other sideeffects this might have if too many packages get too many
points from the get-go.
Second part of fixing #960705, now with pkgProblemResolver output which
looks more like the whole class of problem is resolved rather than a
teeny tiny edgecase it was before.
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The previous commit deals with negative, now we add the positive side of
things as well which makes this a recursive endevour. As we can push the
protected flag forward only if a single solution for a dependency exists
it is easy for trees to not get it, so if resolving becomes difficult it
won't help at all.
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If we propagate protected e.g. due to a user request we should also act
upon (at the moment) satisfied negative dependencies so that the
resolver knows that installing this package later is not an option.
That the problem resolver is trying bad solutions is a bug by
itself which existed before and after and should be worked on.
Closes: #960705
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We exit early from installing dependencies of a package only if it is
not a user request to avoid polluting the state with installs which
might not be needed (or detrimental even) for alternative choices.
We do continue with installing dependencies though if it is a user
request as it will improve error reporting for apt and can even help
aptitude not hang itself so much as we trim the problem space down for
its resolver dealing with all the easy things.
Similar things can be said about the testcase I have short-circuit
previously… keep going test, do what you should do to report errors!
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(CVE-2020-3810)
When normalizing ar member names by removing trailing whitespace
and slashes, an out-out-bound read can be caused if the ar member
name consists only of such characters, because the code did not
stop at 0, but would wrap around and continue reading from the
stack, without any limit.
Add a check to abort if we reached the first character in the
name, effectively rejecting the use of names consisting just
of slashes and spaces.
Furthermore, certain error cases in arfile.cc and extracttar.cc have
included member names in the output that were not checked at all and
might hence not be nul terminated, leading to further out of bound reads.
Fixes Debian/apt#111
LP: #1878177
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apt marks packages coming from the commandline among others
as protected to ensure the various resolver parts do not fiddle
with the state of these packages. aptitude (and potentially others)
do not so the state is modified (to a Keep which for uninstalled means
it is not going to be installed) due to being uninstallable before
the call fails – basically reverting at least some state changes the
call made before it realized it has to fail, which is usually a good
idea, except if users expect you to not do it.
They do set the FromUser option though which has beside controlling
autobit also gained the notion of "the user is always right" over time
and can be used for this one here as well preventing the state revert.
References: 0de399391372450d0162b5a09bfca554b2d27c3d
Reported-By: Jessica Clarke <jrtc27@debian.org> on IRC
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Previously (and still in cacheset), patterns where only allowed to
start with ? or ~, which ignores the fact that a pattern might just
as well start with a negation, such a !~nfoo.
Also, we ignored the --regex flag if it looked like this, which
was somewhat bad.
Let's change this all:
* If --regex is given, arguments are always interpreted as regex
* If it is a valid package wildcard (name or * characters), then
it will be interpreted as a wildcard - this set of characters is
free from meaningful overlap with patterns.
* Otherwise, the argument is interpreted as a pattern.
For a future version, we need to adapt parsing for cacheset and
list to use a common parser, to avoid differences in their
interpretation. Likely, this code will go into the pattern parser,
such that it generates a pattern given a valid fnmatch argument
for example.
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Reinstate * wildcards as they are safe to use, but do not allow any
other special characters such as ? or [].
Notably, ? would overlap with patterns, and [] might overlap with
future pattern extensions (alternative bracketing style), it's also
hard to explain.
Closes: #953531
LP: #1872200
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Strange things happen if while resolving the dependencies of a package
said dependencies want to remove the package. The allow-scores test e.g.
removed the preferred alternative in favor of the last one now that they
were exclusive. In our or-group for Recommends we would "just" not
statisfy the Recommends and for Depends we engage the ProblemResolver…
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In normal upgrade scenarios this is no problem as the orgroup member
will be marked for upgrade already, but on a not fully upgraded system
(or while you operate on a different target release) we would go with our
usual "first come first serve" approach which might lead us to install
another provider who comes earlier – bad if the providers conflict.
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If a package is protected and has a dependency satisfied only by a single
package (or conflicts with a package) this package must be part of the
solution and so we can help later actions not exploring dead ends by
propagating the protected flag to these "pseudo-protected" packages.
An (obscure) bug this can help prevent (to some extend) is shown in
test-apt-never-markauto-sections by not causing irreversible autobit
transfers.
As a sideeffect it seems also to help our crude ShowBroken to display
slightly more helpful messages involving the packages which are actually
in conflict.
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