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Merge pull request #5875 from hercules-ci/fix-large-drv-field-stack-overflow

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Fix segfault or stack overflow caused by large derivation fields
This commit is contained in:
Eelco Dolstra 2022-01-24 12:05:30 +01:00 committed by GitHub
parent c9a4ddb9c0 0407436b0f
commit 076945c808
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 23 additions and 1 deletions
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5
src/libstore/derivations.cc
View file

@ -4,6 +4,7 @@
#include "util.hh"
#include "worker-protocol.hh"
#include "fs-accessor.hh"
#include <boost/container/small_vector.hpp>
namespace nix {
@ -272,7 +273,9 @@ Derivation parseDerivation(const Store & store, std::string && s, std::string_vi
static void printString(string & res, std::string_view s)
{
char buf[s.size() * 2 + 2];
boost::container::small_vector<char, 64 * 1024> buffer;
buffer.reserve(s.size() * 2 + 2);
char * buf = buffer.data();
char * p = buf;
*p++ = '"';
for (auto c : s)

13
tests/big-derivation-attr.nix Normal file
View file

@ -0,0 +1,13 @@
let
sixteenBytes = "0123456789abcdef";
times16 = s: builtins.concatStringsSep "" [s s s s s s s s s s s s s s s s];
exp = n: x: if n == 1 then x else times16 (exp (n - 1) x);
sixteenMegabyte = exp 6 sixteenBytes;
in
assert builtins.stringLength sixteenMegabyte == 16777216;
derivation {
name = "big-derivation-attr";
builder = "/x";
system = "y";
bigAttr = sixteenMegabyte;
}

6
tests/simple.sh
View file

@ -25,3 +25,9 @@ if test "$outPath" != "/foo/lfy1s6ca46rm5r6w4gg9hc0axiakjcnm-dependencies.drv";
echo "hashDerivationModulo appears broken, got $outPath"
exit 1
fi
outPath="$(NIX_REMOTE=local?store=/foo\&real=$TEST_ROOT/real-store nix-instantiate --readonly-mode big-derivation-attr.nix)"
if test "$outPath" != "/foo/xxiwa5zlaajv6xdjynf9yym9g319d6mn-big-derivation-attr.drv"; then
echo "big-derivation-attr.nix hash appears broken, got $outPath. Memory corruption in large drv attr?"
exit 1
fi