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local-store: make extended attribute handling more robust

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* Move the extended attribute deletion after the hardlink sanity check. We
  shouldn't be removing extended attributes on random files.
* Make the entity owner-writable before attempting to remove extended
  attributes, since this operation usually requires write access on the file,
  and we shouldn't fail xattr deletion on a file that has been made unwritable
  by the builder or a previous canonicalisation pass.

Fixes: lix-project/lix#507
Change-Id: I7e6ccb71649185764cd5210f4a4794ee174afea6
This commit is contained in:
alois31 2024-09-10 18:05:32 +02:00
parent cc183fdbc1
commit 3f07c65510
Signed by untrusted user: alois31
GPG key ID: E0F59EA5E5216914
1 changed files with 23 additions and 21 deletions
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44
src/libstore/local-store.cc
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@ -664,27 +664,6 @@ static void canonicalisePathMetaData_(
if (!(S_ISREG(st.st_mode) || S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode)))
throw Error("file '%1%' has an unsupported type", path);
#if __linux__
/* Remove extended attributes / ACLs. */
ssize_t eaSize = llistxattr(path.c_str(), nullptr, 0);
if (eaSize < 0) {
if (errno != ENOTSUP && errno != ENODATA)
throw SysError("querying extended attributes of '%s'", path);
} else if (eaSize > 0) {
std::vector<char> eaBuf(eaSize);
if ((eaSize = llistxattr(path.c_str(), eaBuf.data(), eaBuf.size())) < 0)
throw SysError("querying extended attributes of '%s'", path);
for (auto & eaName: tokenizeString<Strings>(std::string(eaBuf.data(), eaSize), std::string("\000", 1))) {
if (settings.ignoredAcls.get().count(eaName)) continue;
if (lremovexattr(path.c_str(), eaName.c_str()) == -1)
throw SysError("removing extended attribute '%s' from '%s'", eaName, path);
}
}
#endif
/* Fail if the file is not owned by the build user. This prevents
us from messing up the ownership/permissions of files
hard-linked into the output (e.g. "ln /etc/shadow $out/foo").
@ -699,6 +678,29 @@ static void canonicalisePathMetaData_(
return;
}
#if __linux__
/* Remove extended attributes / ACLs. */
ssize_t eaSize = llistxattr(path.c_str(), nullptr, 0);
if (eaSize < 0) {
if (errno != ENOTSUP && errno != ENODATA)
throw SysError("querying extended attributes of '%s'", path);
} else if (eaSize > 0) {
std::vector<char> eaBuf(eaSize);
if ((eaSize = llistxattr(path.c_str(), eaBuf.data(), eaBuf.size())) < 0)
throw SysError("querying extended attributes of '%s'", path);
if (S_ISREG(st.st_mode) || S_ISDIR(st.st_mode))
chmod(path.c_str(), st.st_mode | S_IWUSR);
for (auto & eaName: tokenizeString<Strings>(std::string(eaBuf.data(), eaSize), std::string("\000", 1))) {
if (settings.ignoredAcls.get().count(eaName)) continue;
if (lremovexattr(path.c_str(), eaName.c_str()) == -1)
throw SysError("removing extended attribute '%s' from '%s'", eaName, path);
}
}
#endif
inodesSeen.insert(Inode(st.st_dev, st.st_ino));
canonicaliseTimestampAndPermissions(path, st);