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handle buffer too small for getgrnam_r

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Signed-off-by: Samuli Thomasson <samuli.thomasson@pm.me>
This commit is contained in:
Samuli Thomasson 2025-06-05 21:29:12 +02:00
parent 62cc737d19
commit 1d358ebb1c
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GPG key ID: 6B8903D2645A5B48
1 changed files with 12 additions and 4 deletions
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16
src/libstore/unix/build/linux-derivation-builder.cc
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@ -252,7 +252,7 @@ struct ChrootLinuxDerivationBuilder : LinuxDerivationBuilder
struct group * gr = nullptr;
long bufsize = sysconf(_SC_GETGR_R_SIZE_MAX);
if (bufsize == -1) bufsize = 16384;
std::vector<char> buffer(bufsize);
std::vector<char> buffer;
for (const auto & group_entry : settings.supplementaryGroups.get()) {
std::string group_name = group_entry;
@ -270,9 +270,17 @@ struct ChrootLinuxDerivationBuilder : LinuxDerivationBuilder
}
}
int ret = getgrnam_r(group_name.c_str(), &grp, buffer.data(), buffer.size(), &gr);
if (ret != 0)
throw Error("getgrnam_r failed for group '%s': %s", group_name, strerror(ret));
while (true) {
buffer.resize(bufsize);
int ret = getgrnam_r(group_name.c_str(), &grp, buffer.data(), buffer.size(), &gr);
if (ret == 0) {
break;
} else if (ret == ERANGE) { // buffer too small
bufsize *= 2;
} else if (ret != 0)
throw Error("getgrnam_r failed for group '%s': %s", group_name, strerror(ret));
}
if (!gr) {
debug("Supplementary group '%s' not found", group_name);
continue;