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Merge branch 'limit_depth_resolveExprPath' of https://github.com/d-goldin/nix

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This commit is contained in:
Eelco Dolstra 2019-12-15 00:22:35 +01:00
commit 2b0365753a
1 changed files with 5 additions and 0 deletions
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5
src/libexpr/parser.y
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@ -576,10 +576,15 @@ Path resolveExprPath(Path path)
{ {
assert(path[0] == '/'); assert(path[0] == '/');
unsigned int followCount = 0, maxFollow = 1024;
/* If `path' is a symlink, follow it. This is so that relative /* If `path' is a symlink, follow it. This is so that relative
path references work. */ path references work. */
struct stat st; struct stat st;
while (true) { while (true) {
// Basic cycle/depth limit to avoid infinite loops.
if (++followCount >= maxFollow)
throw Error(format("can't resolve expression. infinite symlink recursion in path '%1%'") % path);
if (lstat(path.c_str(), &st)) if (lstat(path.c_str(), &st))
throw SysError(format("getting status of '%1%'") % path); throw SysError(format("getting status of '%1%'") % path);
if (!S_ISLNK(st.st_mode)) break; if (!S_ISLNK(st.st_mode)) break;