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Don't resolve symlinks while checking __impureHostDeps

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Since these come from untrusted users, we shouldn't do any I/O on them
before we've checked that they're in an allowed prefix.
This commit is contained in:
Eelco Dolstra 2015-01-13 11:16:32 +01:00
parent f1151a3373
commit 100961e370
1 changed files with 5 additions and 2 deletions
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7
src/libstore/build.cc
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@ -1784,10 +1784,13 @@ void DerivationGoal::startBuilder()
for (auto & i : impurePaths) { for (auto & i : impurePaths) {
bool found = false; bool found = false;
Path canonI = canonPath(i, true); /* Note: we're not resolving symlinks here to prevent
giving a non-root user info about inaccessible
files. */
Path canonI = canonPath(i);
/* If only we had a trie to do this more efficiently :) luckily, these are generally going to be pretty small */ /* If only we had a trie to do this more efficiently :) luckily, these are generally going to be pretty small */
for (auto & a : allowedPaths) { for (auto & a : allowedPaths) {
Path canonA = canonPath(a, true); Path canonA = canonPath(a);
if (canonI == canonA || isInDir(canonI, canonA)) { if (canonI == canonA || isInDir(canonI, canonA)) {
found = true; found = true;
break; break;