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diff --git a/scripts/Dpkg/Source/Patch.pm b/scripts/Dpkg/Source/Patch.pm
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--- a/scripts/Dpkg/Source/Patch.pm
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+++ b/scripts/Dpkg/Source/Patch.pm
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@@ -322,8 +322,9 @@ sub analyze {
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error(_g("expected ^--- in line %d of diff `%s'"), $., $diff);
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}
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$_ = strip_ts($_);
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- if ($_ eq '/dev/null' or s{^(\./)?[^/]+/}{$destdir/}) {
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+ if ($_ eq '/dev/null' or s{^[^/]+/}{$destdir/}) {
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$fn = $_;
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+ error(_g("%s contains an insecure path: %s"), $diff, $_) if m{/\.\./};
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}
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if (/\.dpkg-orig$/) {
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error(_g("diff `%s' patches file with name ending .dpkg-orig"), $diff);
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@@ -336,8 +337,9 @@ sub analyze {
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error(_g("line after --- isn't as expected in diff `%s' (line %d)"), $diff, $.);
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}
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$_ = strip_ts($_);
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- if ($_ eq '/dev/null' or s{^(\./)?[^/]+/}{$destdir/}) {
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+ if ($_ eq '/dev/null' or s{^[^/]+/}{$destdir/}) {
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$fn2 = $_;
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+ error(_g("%s contains an insecure path: %s"), $diff, $_) if m{/\.\./};
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} else {
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unless (defined $fn) {
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error(_g("none of the filenames in ---/+++ are relative in diff `%s' (line %d)"),
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@@ -363,6 +365,17 @@ sub analyze {
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if ($dirname =~ s{/[^/]+$}{} && not -d $dirname) {
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$dirtocreate{$dirname} = 1;
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}
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+
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+ # Sanity check, refuse to patch through a symlink
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+ $dirname = $fn;
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+ while (1) {
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+ if (-l $dirname) {
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+ error(_g("diff %s modifies file %s through a symlink: %s"),
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+ $diff, $fn, $dirname);
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+ }
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+ last unless $dirname =~ s{/[^/]+$}{};
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+ }
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+
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if (-e $fn and not -f _) {
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error(_g("diff `%s' patches something which is not a plain file"), $diff);
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}
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