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docker
0006-bsc1221916-update-to-patched-buildkit-vers...
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File 0006-bsc1221916-update-to-patched-buildkit-version-to-fix.patch of Package docker
From df2f4064006a11c299171a10a13d4d1f54a1e37f Mon Sep 17 00:00:00 2001 From: Aleksa Sarai <cyphar@cyphar.com> Date: Tue, 7 May 2024 01:51:25 +1000 Subject: [PATCH 6/7] bsc1221916: update to patched buildkit version to fix symlink resolution SUSE-Bugs: https://bugzilla.suse.com/show_bug.cgi?id=1221916 Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> --- vendor.mod | 2 + vendor.sum | 4 +- .../buildkit/cache/contenthash/checksum.go | 393 ++++++++++-------- .../moby/buildkit/cache/contenthash/path.go | 161 +++---- vendor/modules.txt | 3 +- 5 files changed, 314 insertions(+), 249 deletions(-) diff --git a/vendor.mod b/vendor.mod index d69d2aa9f87f..5c42a653b91b 100644 --- a/vendor.mod +++ b/vendor.mod @@ -114,6 +114,8 @@ require ( tags.cncf.io/container-device-interface v0.7.2 ) +replace github.com/moby/buildkit => github.com/cyphar/buildkit v0.0.0-20240624075140-0db2d2345b94 + require ( cloud.google.com/go v0.110.8 // indirect cloud.google.com/go/compute v1.23.1 // indirect diff --git a/vendor.sum b/vendor.sum index 7a5bd6b4077b..f2aba7f8d3eb 100644 --- a/vendor.sum +++ b/vendor.sum @@ -199,6 +199,8 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3 github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY= github.com/creack/pty v1.1.18/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4= +github.com/cyphar/buildkit v0.0.0-20240624075140-0db2d2345b94 h1:xBwPT+ap0LDYsQJh1VKm9NNEKF5A7e/P3TRjnbTqZUE= +github.com/cyphar/buildkit v0.0.0-20240624075140-0db2d2345b94/go.mod h1:2cyVOv9NoHM7arphK9ZfHIWKn9YVZRFd1wXB8kKmEzY= github.com/cyphar/filepath-securejoin v0.2.4 h1:Ugdm7cg7i6ZK6x3xDF1oEu1nfkyfH53EtKeQYTC3kyg= github.com/cyphar/filepath-securejoin v0.2.4/go.mod h1:aPGpWjXOXUn2NCNjFvBE6aRxGGx79pTxQpKOJNYHHl4= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= @@ -480,8 +482,6 @@ github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ= github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw= github.com/mndrix/tap-go v0.0.0-20171203230836-629fa407e90b/go.mod h1:pzzDgJWZ34fGzaAZGFW22KVZDfyrYW+QABMrWnJBnSs= -github.com/moby/buildkit v0.13.2 h1:nXNszM4qD9E7QtG7bFWPnDI1teUQFQglBzon/IU3SzI= -github.com/moby/buildkit v0.13.2/go.mod h1:2cyVOv9NoHM7arphK9ZfHIWKn9YVZRFd1wXB8kKmEzY= github.com/moby/docker-image-spec v1.3.1 h1:jMKff3w6PgbfSa69GfNg+zN/XLhfXJGnEx3Nl2EsFP0= github.com/moby/docker-image-spec v1.3.1/go.mod h1:eKmb5VW8vQEh/BAr2yvVNvuiJuY6UIocYsFu/DxxRpo= github.com/moby/ipvs v1.1.0 h1:ONN4pGaZQgAx+1Scz5RvWV4Q7Gb+mvfRh3NsPS+1XQQ= diff --git a/vendor/github.com/moby/buildkit/cache/contenthash/checksum.go b/vendor/github.com/moby/buildkit/cache/contenthash/checksum.go index e0f58d57b3db..ec649f69b5e0 100644 --- a/vendor/github.com/moby/buildkit/cache/contenthash/checksum.go +++ b/vendor/github.com/moby/buildkit/cache/contenthash/checksum.go @@ -10,6 +10,7 @@ import ( "path/filepath" "strings" "sync" + "sync/atomic" iradix "github.com/hashicorp/go-immutable-radix" "github.com/hashicorp/golang-lru/simplelru" @@ -290,7 +291,7 @@ func keyPath(p string) string { // HandleChange notifies the source about a modification operation func (cc *cacheContext) HandleChange(kind fsutil.ChangeKind, p string, fi os.FileInfo, err error) (retErr error) { p = keyPath(p) - k := convertPathToKey([]byte(p)) + k := convertPathToKey(p) deleteDir := func(cr *CacheRecord) { if cr.Type == CacheRecordTypeDir { @@ -369,7 +370,7 @@ func (cc *cacheContext) HandleChange(kind fsutil.ChangeKind, p string, fi os.Fil // note that the source may be called later because data writing is async if fi.Mode()&os.ModeSymlink == 0 && stat.Linkname != "" { ln := path.Join("/", filepath.ToSlash(stat.Linkname)) - v, ok := cc.txn.Get(convertPathToKey([]byte(ln))) + v, ok := cc.txn.Get(convertPathToKey(ln)) if ok { cp := *v.(*CacheRecord) cr = &cp @@ -407,7 +408,7 @@ func (cc *cacheContext) Checksum(ctx context.Context, mountable cache.Mountable, defer m.clean() if !opts.Wildcard && len(opts.IncludePatterns) == 0 && len(opts.ExcludePatterns) == 0 { - return cc.checksumFollow(ctx, m, p, opts.FollowLinks) + return cc.lazyChecksum(ctx, m, p, opts.FollowLinks) } includedPaths, err := cc.includedPaths(ctx, m, p, opts) @@ -418,7 +419,7 @@ func (cc *cacheContext) Checksum(ctx context.Context, mountable cache.Mountable, if opts.FollowLinks { for i, w := range includedPaths { if w.record.Type == CacheRecordTypeSymlink { - dgst, err := cc.checksumFollow(ctx, m, w.path, opts.FollowLinks) + dgst, err := cc.lazyChecksum(ctx, m, w.path, opts.FollowLinks) if err != nil { return "", err } @@ -445,30 +446,6 @@ func (cc *cacheContext) Checksum(ctx context.Context, mountable cache.Mountable, return digester.Digest(), nil } -func (cc *cacheContext) checksumFollow(ctx context.Context, m *mount, p string, follow bool) (digest.Digest, error) { - const maxSymlinkLimit = 255 - i := 0 - for { - if i > maxSymlinkLimit { - return "", errors.Errorf("too many symlinks: %s", p) - } - cr, err := cc.checksumNoFollow(ctx, m, p) - if err != nil { - return "", err - } - if cr.Type == CacheRecordTypeSymlink && follow { - link := cr.Linkname - if !path.IsAbs(cr.Linkname) { - link = path.Join(path.Dir(p), link) - } - i++ - p = link - } else { - return cr.Digest, nil - } - } -} - func (cc *cacheContext) includedPaths(ctx context.Context, m *mount, p string, opts ChecksumOpts) ([]*includedPath, error) { cc.mu.Lock() defer cc.mu.Unlock() @@ -478,12 +455,12 @@ func (cc *cacheContext) includedPaths(ctx context.Context, m *mount, p string, o } root := cc.tree.Root() - scan, err := cc.needsScan(root, "") + scan, err := cc.needsScan(root, "", false) if err != nil { return nil, err } if scan { - if err := cc.scanPath(ctx, m, ""); err != nil { + if err := cc.scanPath(ctx, m, "", false); err != nil { return nil, err } } @@ -536,13 +513,13 @@ func (cc *cacheContext) includedPaths(ctx context.Context, m *mount, p string, o } } else { origPrefix = p - k = convertPathToKey([]byte(origPrefix)) + k = convertPathToKey(origPrefix) // We need to resolve symlinks here, in case the base path // involves a symlink. That will match fsutil behavior of // calling functions such as stat and walk. var cr *CacheRecord - k, cr, err = getFollowLinks(root, k, true) + k, cr, err = getFollowLinks(root, k, false) if err != nil { return nil, err } @@ -554,7 +531,7 @@ func (cc *cacheContext) includedPaths(ctx context.Context, m *mount, p string, o iter.SeekLowerBound(append(append([]byte{}, k...), 0)) } - resolvedPrefix = string(convertKeyToPath(k)) + resolvedPrefix = convertKeyToPath(k) } else { k, _, keyOk = iter.Next() } @@ -565,7 +542,7 @@ func (cc *cacheContext) includedPaths(ctx context.Context, m *mount, p string, o ) for keyOk { - fn := string(convertKeyToPath(k)) + fn := convertKeyToPath(k) // Convert the path prefix from what we found in the prefix // tree to what the argument specified. @@ -751,36 +728,12 @@ func wildcardPrefix(root *iradix.Node, p string) (string, []byte, bool, error) { return "", nil, false, nil } - linksWalked := 0 - k, cr, err := getFollowLinksWalk(root, convertPathToKey([]byte(d1)), true, &linksWalked) + // Only resolve the final symlink component if there are components in the + // wildcard segment. + k, cr, err := getFollowLinks(root, convertPathToKey(d1), d2 != "") if err != nil { return "", k, false, err } - - if d2 != "" && cr != nil && cr.Type == CacheRecordTypeSymlink { - // getFollowLinks only handles symlinks in path - // components before the last component, so - // handle last component in d1 specially. - resolved := string(convertKeyToPath(k)) - for { - v, ok := root.Get(k) - - if !ok { - return d1, k, false, nil - } - if v.(*CacheRecord).Type != CacheRecordTypeSymlink { - break - } - - linksWalked++ - if linksWalked > 255 { - return "", k, false, errors.Errorf("too many links") - } - - resolved := cleanLink(resolved, v.(*CacheRecord).Linkname) - k = convertPathToKey([]byte(resolved)) - } - } return d1, k, cr != nil, nil } @@ -816,19 +769,22 @@ func containsWildcards(name string) bool { return false } -func (cc *cacheContext) checksumNoFollow(ctx context.Context, m *mount, p string) (*CacheRecord, error) { +func (cc *cacheContext) lazyChecksum(ctx context.Context, m *mount, p string, followTrailing bool) (digest.Digest, error) { p = keyPath(p) + k := convertPathToKey(p) + // Try to look up the path directly without doing a scan. cc.mu.RLock() if cc.txn == nil { root := cc.tree.Root() cc.mu.RUnlock() - v, ok := root.Get(convertPathToKey([]byte(p))) - if ok { - cr := v.(*CacheRecord) - if cr.Digest != "" { - return cr, nil - } + + _, cr, err := getFollowLinks(root, k, followTrailing) + if err != nil { + return "", err + } + if cr != nil && cr.Digest != "" { + return cr.Digest, nil } } else { cc.mu.RUnlock() @@ -848,7 +804,11 @@ func (cc *cacheContext) checksumNoFollow(ctx context.Context, m *mount, p string } }() - return cc.lazyChecksum(ctx, m, p) + cr, err := cc.scanChecksum(ctx, m, p, followTrailing) + if err != nil { + return "", err + } + return cr.Digest, nil } func (cc *cacheContext) commitActiveTransaction() { @@ -856,7 +816,7 @@ func (cc *cacheContext) commitActiveTransaction() { addParentToMap(d, cc.dirtyMap) } for d := range cc.dirtyMap { - k := convertPathToKey([]byte(d)) + k := convertPathToKey(d) if _, ok := cc.txn.Get(k); ok { cc.txn.Insert(k, &CacheRecord{Type: CacheRecordTypeDir}) } @@ -867,21 +827,21 @@ func (cc *cacheContext) commitActiveTransaction() { cc.txn = nil } -func (cc *cacheContext) lazyChecksum(ctx context.Context, m *mount, p string) (*CacheRecord, error) { +func (cc *cacheContext) scanChecksum(ctx context.Context, m *mount, p string, followTrailing bool) (*CacheRecord, error) { root := cc.tree.Root() - scan, err := cc.needsScan(root, p) + scan, err := cc.needsScan(root, p, followTrailing) if err != nil { return nil, err } if scan { - if err := cc.scanPath(ctx, m, p); err != nil { + if err := cc.scanPath(ctx, m, p, followTrailing); err != nil { return nil, err } } - k := convertPathToKey([]byte(p)) + k := convertPathToKey(p) txn := cc.tree.Txn() root = txn.Root() - cr, updated, err := cc.checksum(ctx, root, txn, m, k, true) + cr, updated, err := cc.checksum(ctx, root, txn, m, k, followTrailing) if err != nil { return nil, err } @@ -890,9 +850,9 @@ func (cc *cacheContext) lazyChecksum(ctx context.Context, m *mount, p string) (* return cr, err } -func (cc *cacheContext) checksum(ctx context.Context, root *iradix.Node, txn *iradix.Txn, m *mount, k []byte, follow bool) (*CacheRecord, bool, error) { +func (cc *cacheContext) checksum(ctx context.Context, root *iradix.Node, txn *iradix.Txn, m *mount, k []byte, followTrailing bool) (*CacheRecord, bool, error) { origk := k - k, cr, err := getFollowLinks(root, k, follow) + k, cr, err := getFollowLinks(root, k, followTrailing) if err != nil { return nil, false, err } @@ -918,7 +878,9 @@ func (cc *cacheContext) checksum(ctx context.Context, root *iradix.Node, txn *ir } h.Write(bytes.TrimPrefix(subk, k)) - subcr, _, err := cc.checksum(ctx, root, txn, m, subk, true) + // We do not follow trailing links when checksumming a directory's + // contents. + subcr, _, err := cc.checksum(ctx, root, txn, m, subk, false) if err != nil { return nil, false, err } @@ -935,7 +897,7 @@ func (cc *cacheContext) checksum(ctx context.Context, root *iradix.Node, txn *ir dgst = digest.NewDigest(digest.SHA256, h) default: - p := string(convertKeyToPath(bytes.TrimSuffix(k, []byte{0}))) + p := convertKeyToPath(bytes.TrimSuffix(k, []byte{0})) target, err := m.mount(ctx) if err != nil { @@ -967,42 +929,82 @@ func (cc *cacheContext) checksum(ctx context.Context, root *iradix.Node, txn *ir return cr2, true, nil } -// needsScan returns false if path is in the tree or a parent path is in tree -// and subpath is missing -func (cc *cacheContext) needsScan(root *iradix.Node, p string) (bool, error) { - var linksWalked int - return cc.needsScanFollow(root, p, &linksWalked) +// pathSet is a set of path prefixes that can be used to see if a given path is +// lexically a child of any path in the set. All paths provided to this set +// MUST be absolute and use / as the separator. +type pathSet struct { + // prefixes contains paths of the form "/a/b/", so that we correctly detect + // /a/b as being a parent of /a/b/c but not /a/bc. + prefixes []string } -func (cc *cacheContext) needsScanFollow(root *iradix.Node, p string, linksWalked *int) (bool, error) { - if p == "/" { - p = "" - } - v, ok := root.Get(convertPathToKey([]byte(p))) - if !ok { - if p == "" { - return true, nil +// add a path to the set. This is a no-op if includes(path) == true. +func (s *pathSet) add(p string) { + // Ensure the path is absolute and clean. + p = path.Join("/", p) + if !s.includes(p) { + if p != "/" { + p += "/" } - return cc.needsScanFollow(root, path.Clean(path.Dir(p)), linksWalked) + s.prefixes = append(s.prefixes, p) + } +} + +// includes returns true iff there is a path in the pathSet which is a lexical +// parent of the given path. The provided path MUST be an absolute path and +// MUST NOT contain any ".." components, as they will be path.Clean'd. +func (s pathSet) includes(p string) bool { + // Ensure the path is absolute and clean. + p = path.Join("/", p) + if p != "/" { + p += "/" } - cr := v.(*CacheRecord) - if cr.Type == CacheRecordTypeSymlink { - if *linksWalked > 255 { - return false, errTooManyLinks + for _, prefix := range s.prefixes { + if strings.HasPrefix(p, prefix) { + return true } - *linksWalked++ - link := path.Clean(cr.Linkname) - if !path.IsAbs(cr.Linkname) { - link = path.Join("/", path.Dir(p), link) + } + return false +} + +// needsScan returns false if path is in the tree or a parent path is in tree +// and subpath is missing. +func (cc *cacheContext) needsScan(root *iradix.Node, path string, followTrailing bool) (bool, error) { + var ( + goodPaths pathSet + hasParentInTree bool + ) + k := convertPathToKey(path) + _, cr, err := getFollowLinksCallback(root, k, followTrailing, func(subpath string, cr *CacheRecord) error { + // If we found a path that exists in the cache, add it to the set of + // known-scanned paths. Otherwise, verify whether the not-found subpath + // is inside a known-scanned path (we might have hit a "..", taking us + // out of the scanned paths, or we might hit a non-existent path inside + // a scanned path). getFollowLinksCallback iterates left-to-right, so + // we will always hit ancestors first. + if cr != nil { + hasParentInTree = cr.Type != CacheRecordTypeSymlink + goodPaths.add(subpath) + } else { + hasParentInTree = goodPaths.includes(subpath) } - return cc.needsScanFollow(root, link, linksWalked) + return nil + }) + if err != nil { + return false, err } - return false, nil + return cr == nil && !hasParentInTree, nil } -func (cc *cacheContext) scanPath(ctx context.Context, m *mount, p string) (retErr error) { +// Only used by TestNeedScanChecksumRegression to make sure scanPath is not +// called for paths we have already scanned. +var ( + scanCounterEnable bool + scanCounter atomic.Uint64 +) + +func (cc *cacheContext) scanPath(ctx context.Context, m *mount, p string, followTrailing bool) (retErr error) { p = path.Join("/", p) - d, _ := path.Split(p) mp, err := m.mount(ctx) if err != nil { @@ -1012,33 +1014,42 @@ func (cc *cacheContext) scanPath(ctx context.Context, m *mount, p string) (retEr n := cc.tree.Root() txn := cc.tree.Txn() - parentPath, err := rootPath(mp, filepath.FromSlash(d), func(p, link string) error { + resolvedPath, err := rootPath(mp, filepath.FromSlash(p), followTrailing, func(p, link string) error { cr := &CacheRecord{ Type: CacheRecordTypeSymlink, Linkname: filepath.ToSlash(link), } - k := []byte(path.Join("/", filepath.ToSlash(p))) - k = convertPathToKey(k) - txn.Insert(k, cr) + p = path.Join("/", filepath.ToSlash(p)) + txn.Insert(convertPathToKey(p), cr) return nil }) if err != nil { return err } - err = filepath.Walk(parentPath, func(itemPath string, fi os.FileInfo, err error) error { + // Scan the parent directory of the path we resolved, unless we're at the + // root (in which case we scan the root). + scanPath := filepath.Dir(resolvedPath) + if !strings.HasPrefix(filepath.ToSlash(scanPath)+"/", filepath.ToSlash(mp)+"/") { + scanPath = resolvedPath + } + + err = filepath.Walk(scanPath, func(itemPath string, fi os.FileInfo, err error) error { + if scanCounterEnable { + scanCounter.Add(1) + } if err != nil { + // If the root doesn't exist, ignore the error. + if itemPath == scanPath && errors.Is(err, os.ErrNotExist) { + return nil + } return errors.Wrapf(err, "failed to walk %s", itemPath) } rel, err := filepath.Rel(mp, itemPath) if err != nil { return err } - k := []byte(path.Join("/", filepath.ToSlash(rel))) - if string(k) == "/" { - k = []byte{} - } - k = convertPathToKey(k) + k := convertPathToKey(keyPath(rel)) if _, ok := n.Get(k); !ok { cr := &CacheRecord{ Type: CacheRecordTypeFile, @@ -1071,55 +1082,118 @@ func (cc *cacheContext) scanPath(ctx context.Context, m *mount, p string) (retEr return nil } -func getFollowLinks(root *iradix.Node, k []byte, follow bool) ([]byte, *CacheRecord, error) { - var linksWalked int - return getFollowLinksWalk(root, k, follow, &linksWalked) +// followLinksCallback is called after we try to resolve each element. If the +// path was not found, cr is nil. +type followLinksCallback func(path string, cr *CacheRecord) error + +// getFollowLinks is shorthand for getFollowLinksCallback(..., nil). +func getFollowLinks(root *iradix.Node, k []byte, followTrailing bool) ([]byte, *CacheRecord, error) { + return getFollowLinksCallback(root, k, followTrailing, nil) } -func getFollowLinksWalk(root *iradix.Node, k []byte, follow bool, linksWalked *int) ([]byte, *CacheRecord, error) { +// getFollowLinksCallback looks up the requested key, fully resolving any +// symlink components encountered. The implementation is heavily based on +// <https://github.com/cyphar/filepath-securejoin>. +// +// followTrailing indicates whether the *final component* of the path should be +// resolved (effectively O_PATH|O_NOFOLLOW). Note that (in contrast to some +// Linux APIs), followTrailing is obeyed even if the key has a trailing slash +// (though paths like "foo/link/." will cause the link to be resolved). +// +// cb is a callback that is called for each path component encountered during +// path resolution (after the path component is looked up in the cache). This +// means for a path like /a/b/c, the callback will be called for at least +// +// {/, /a, /a/b, /a/b/c} +// +// Note that if any of the components are symlinks, the paths will depend on +// the symlink contents and there will be more callbacks. If the requested key +// has a trailing slash, the callback will also be called for the final +// trailing-slash lookup (/a/b/c/ in the above example). Note that +// getFollowLinksCallback will try to look up the original key directly first +// and the callback is not called for this first lookup. +func getFollowLinksCallback(root *iradix.Node, k []byte, followTrailing bool, cb followLinksCallback) ([]byte, *CacheRecord, error) { v, ok := root.Get(k) - if ok { + if ok && (!followTrailing || v.(*CacheRecord).Type != CacheRecordTypeSymlink) { return k, v.(*CacheRecord), nil } - if !follow || len(k) == 0 { + if len(k) == 0 { return k, nil, nil } - dir, file := splitKey(k) + var ( + currentPath = "/" + remainingPath = convertKeyToPath(k) + linksWalked int + cr *CacheRecord + ) + // Trailing slashes are significant for the cache, but path.Clean strips + // them. We only care about the slash for the final lookup. + remainingPath, hadTrailingSlash := strings.CutSuffix(remainingPath, "/") + for remainingPath != "" { + // Get next component. + var part string + if i := strings.IndexRune(remainingPath, '/'); i == -1 { + part, remainingPath = remainingPath, "" + } else { + part, remainingPath = remainingPath[:i], remainingPath[i+1:] + } - k, parent, err := getFollowLinksWalk(root, dir, follow, linksWalked) - if err != nil { - return nil, nil, err - } - if parent != nil { - if parent.Type == CacheRecordTypeSymlink { - *linksWalked++ - if *linksWalked > 255 { - return nil, nil, errors.Errorf("too many links") + // Apply the component to the path. Since it is a single component, and + // our current path contains no symlinks, we can just apply it + // leixically. + nextPath := keyPath(path.Join("/", currentPath, part)) + // In contrast to rootPath, we don't skip lookups for no-op components + // or / because we need to call the callback for every path component + // we hit (including /) and we need to make sure that the CacheRecord + // we return is correct after every iteration. + + cr = nil + v, ok := root.Get(convertPathToKey(nextPath)) + if ok { + cr = v.(*CacheRecord) + } + if cb != nil { + if err := cb(nextPath, cr); err != nil { + return nil, nil, err } + } + if !ok || cr.Type != CacheRecordTypeSymlink { + currentPath = nextPath + continue + } + if !followTrailing && remainingPath == "" { + currentPath = nextPath + break + } - link := cleanLink(string(convertKeyToPath(dir)), parent.Linkname) - return getFollowLinksWalk(root, append(convertPathToKey([]byte(link)), file...), follow, linksWalked) + linksWalked++ + if linksWalked > maxSymlinkLimit { + return nil, nil, errTooManyLinks } - } - k = append(k, file...) - v, ok = root.Get(k) - if ok { - return k, v.(*CacheRecord), nil - } - return k, nil, nil -} -func cleanLink(dir, linkname string) string { - dirPath := path.Clean(dir) - if dirPath == "." || dirPath == "/" { - dirPath = "" + remainingPath = cr.Linkname + "/" + remainingPath + if path.IsAbs(cr.Linkname) { + currentPath = "/" + } } - link := path.Clean(linkname) - if !path.IsAbs(link) { - return path.Join("/", path.Join(path.Dir(dirPath), link)) + // We've already looked up the final component. However, if there was a + // trailing slash in the original path, we need to do the lookup again with + // the slash applied. + if hadTrailingSlash { + cr = nil + currentPath += "/" + v, ok := root.Get(convertPathToKey(currentPath)) + if ok { + cr = v.(*CacheRecord) + } + if cb != nil { + if err := cb(currentPath, cr); err != nil { + return nil, nil, err + } + } } - return link + return convertPathToKey(currentPath), cr, nil } func prepareDigest(fp, p string, fi os.FileInfo) (digest.Digest, error) { @@ -1176,25 +1250,10 @@ func poolsCopy(dst io.Writer, src io.Reader) (written int64, err error) { return } -func convertPathToKey(p []byte) []byte { +func convertPathToKey(p string) []byte { return bytes.Replace([]byte(p), []byte("/"), []byte{0}, -1) } -func convertKeyToPath(p []byte) []byte { - return bytes.Replace([]byte(p), []byte{0}, []byte("/"), -1) -} - -func splitKey(k []byte) ([]byte, []byte) { - foundBytes := false - i := len(k) - 1 - for { - if i <= 0 || foundBytes && k[i] == 0 { - break - } - if k[i] != 0 { - foundBytes = true - } - i-- - } - return append([]byte{}, k[:i]...), k[i:] +func convertKeyToPath(p []byte) string { + return string(bytes.Replace(p, []byte{0}, []byte("/"), -1)) } diff --git a/vendor/github.com/moby/buildkit/cache/contenthash/path.go b/vendor/github.com/moby/buildkit/cache/contenthash/path.go index 42b7fd8349c7..ae950f713241 100644 --- a/vendor/github.com/moby/buildkit/cache/contenthash/path.go +++ b/vendor/github.com/moby/buildkit/cache/contenthash/path.go @@ -1,108 +1,111 @@ +// This code mostly comes from <https://github.com/cyphar/filepath-securejoin>. + +// Copyright (C) 2014-2015 Docker Inc & Go Authors. All rights reserved. +// Copyright (C) 2017-2024 SUSE LLC. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + package contenthash import ( "os" "path/filepath" + "strings" "github.com/pkg/errors" ) -var ( - errTooManyLinks = errors.New("too many links") -) +var errTooManyLinks = errors.New("too many links") + +const maxSymlinkLimit = 255 type onSymlinkFunc func(string, string) error -// rootPath joins a path with a root, evaluating and bounding any -// symlink to the root directory. -// This is containerd/continuity/fs RootPath implementation with a callback on -// resolving the symlink. -func rootPath(root, path string, cb onSymlinkFunc) (string, error) { - if path == "" { +// rootPath joins a path with a root, evaluating and bounding any symlink to +// the root directory. This is a slightly modified version of SecureJoin from +// github.com/cyphar/filepath-securejoin, with a callback which we call after +// each symlink resolution. +func rootPath(root, unsafePath string, followTrailing bool, cb onSymlinkFunc) (string, error) { + if unsafePath == "" { return root, nil } - var linksWalked int // to protect against cycles - for { - i := linksWalked - newpath, err := walkLinks(root, path, &linksWalked, cb) - if err != nil { - return "", err - } - path = newpath - if i == linksWalked { - newpath = filepath.Join("/", newpath) - if path == newpath { - return filepath.Join(root, newpath), nil - } - path = newpath - } - } -} -func walkLink(root, path string, linksWalked *int, cb onSymlinkFunc) (newpath string, islink bool, err error) { - if *linksWalked > 255 { - return "", false, errTooManyLinks - } + unsafePath = filepath.FromSlash(unsafePath) + var ( + currentPath string + linksWalked int + ) + for unsafePath != "" { + // Windows-specific: remove any drive letters from the path. + if v := filepath.VolumeName(unsafePath); v != "" { + unsafePath = unsafePath[len(v):] + } - path = filepath.Join("/", path) - if path == "/" { - return path, false, nil - } - realPath := filepath.Join(root, path) + // Remove any unnecessary trailing slashes. + unsafePath = strings.TrimSuffix(unsafePath, string(filepath.Separator)) - fi, err := os.Lstat(realPath) - if err != nil { - // If path does not yet exist, treat as non-symlink - if errors.Is(err, os.ErrNotExist) { - return path, false, nil + // Get the next path component. + var part string + if i := strings.IndexRune(unsafePath, filepath.Separator); i == -1 { + part, unsafePath = unsafePath, "" + } else { + part, unsafePath = unsafePath[:i], unsafePath[i+1:] } - return "", false, err - } - if fi.Mode()&os.ModeSymlink == 0 { - return path, false, nil - } - newpath, err = os.Readlink(realPath) - if err != nil { - return "", false, err - } - if cb != nil { - if err := cb(path, newpath); err != nil { - return "", false, err - } - } - *linksWalked++ - return newpath, true, nil -} -func walkLinks(root, path string, linksWalked *int, cb onSymlinkFunc) (string, error) { - switch dir, file := filepath.Split(path); { - case dir == "": - newpath, _, err := walkLink(root, file, linksWalked, cb) - return newpath, err - case file == "": - if os.IsPathSeparator(dir[len(dir)-1]) { - if dir == "/" { - return dir, nil - } - return walkLinks(root, dir[:len(dir)-1], linksWalked, cb) + // Apply the component lexically to the path we are building. path does + // not contain any symlinks, and we are lexically dealing with a single + // component, so it's okay to do filepath.Clean here. + nextPath := filepath.Join(string(filepath.Separator), currentPath, part) + if nextPath == string(filepath.Separator) { + // If we end up back at the root, we don't need to re-evaluate /. + currentPath = "" + continue } - newpath, _, err := walkLink(root, dir, linksWalked, cb) - return newpath, err - default: - newdir, err := walkLinks(root, dir, linksWalked, cb) - if err != nil { + fullPath := root + string(filepath.Separator) + nextPath + + // Figure out whether the path is a symlink. + fi, err := os.Lstat(fullPath) + if err != nil && !errors.Is(err, os.ErrNotExist) { return "", err } - newpath, islink, err := walkLink(root, filepath.Join(newdir, file), linksWalked, cb) + // Treat non-existent path components the same as non-symlinks (we + // can't do any better here). + if errors.Is(err, os.ErrNotExist) || fi.Mode()&os.ModeSymlink == 0 { + currentPath = nextPath + continue + } + // Don't resolve the final component with !followTrailing. + if !followTrailing && unsafePath == "" { + currentPath = nextPath + break + } + + // It's a symlink, so get its contents and expand it by prepending it + // to the yet-unparsed path. + linksWalked++ + if linksWalked > maxSymlinkLimit { + return "", errTooManyLinks + } + + dest, err := os.Readlink(fullPath) if err != nil { return "", err } - if !islink { - return newpath, nil + if cb != nil { + if err := cb(nextPath, dest); err != nil { + return "", err + } } - if filepath.IsAbs(newpath) { - return newpath, nil + + unsafePath = dest + string(filepath.Separator) + unsafePath + // Absolute symlinks reset any work we've already done. + if filepath.IsAbs(dest) { + currentPath = "" } - return filepath.Join(newdir, newpath), nil } + + // There should be no lexical components left in path here, but just for + // safety do a filepath.Clean before the join. + finalPath := filepath.Join(string(filepath.Separator), currentPath) + return filepath.Join(root, finalPath), nil } diff --git a/vendor/modules.txt b/vendor/modules.txt index 7f3e6497785d..247f49f3518e 100644 --- a/vendor/modules.txt +++ b/vendor/modules.txt @@ -711,7 +711,7 @@ github.com/mitchellh/hashstructure/v2 # github.com/mitchellh/reflectwalk v1.0.2 ## explicit github.com/mitchellh/reflectwalk -# github.com/moby/buildkit v0.13.2 +# github.com/moby/buildkit v0.13.2 => github.com/cyphar/buildkit v0.0.0-20240624075140-0db2d2345b94 ## explicit; go 1.21 github.com/moby/buildkit/api/services/control github.com/moby/buildkit/api/types @@ -1610,3 +1610,4 @@ tags.cncf.io/container-device-interface/pkg/parser # tags.cncf.io/container-device-interface/specs-go v0.7.0 ## explicit; go 1.19 tags.cncf.io/container-device-interface/specs-go +# github.com/moby/buildkit => github.com/cyphar/buildkit v0.0.0-20240624075140-0db2d2345b94 -- 2.45.2
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