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Fix bug with resolving relative symlinks during linux header detection #2038

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merged 3 commits into from
Oct 11, 2024
Merged

Fix bug with resolving relative symlinks during linux header detection #2038

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be6ddb1
Fix bug with resolving relative symlinks during linux header detection
ddelnano Oct 3, 2024
0322c23
Resolve relative symlink instead of clobbering it. Remove unnecssary …
ddelnano Oct 11, 2024
ed7b839
Update logging to VLOG and address other feedback
ddelnano Oct 11, 2024
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16 changes: 15 additions & 1 deletion src/stirling/utils/linux_headers.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -229,7 +229,21 @@ StatusOr<std::filesystem::path> ResolvePossibleSymlinkToHostPath(const std::file
return error::Internal(ec.message());
}

const auto resolved_host_path = system::Config::GetInstance().ToHostPath(resolved);
// Relative paths containing "../" can result in an invalid host mount path when using
// ToHostPath. Therefore, we need to treat the absolute and relative cases differently.
std::filesystem::path resolved_host_path;
if (resolved.is_absolute()) {
resolved_host_path = system::Config::GetInstance().ToHostPath(resolved);
VLOG(1) << absl::Substitute(
"Symlink target is an absolute path. Converting that to host path: $0 -> $1.",
resolved.string(), resolved_host_path.string());
} else {
resolved_host_path = p.parent_path();
resolved_host_path /= resolved.string();
VLOG(1) << absl::Substitute(
"Symlink target is a relative path. Concatenating it to parent directory: $0",
resolved_host_path.string());
}

// Downstream won't be ok unless the resolved host path exists; return an error if needed.
if (!fs::Exists(resolved_host_path)) {
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