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gc: Read arguments on darwin

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Artemis Tosini 2024-03-30 21:17:28 -04:00
parent 8ce48856e8
commit b02f1564d3
1 changed files with 32 additions and 1 deletions
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33
src/libstore/gc.cc
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@ -24,6 +24,7 @@
#ifdef __APPLE__
#include <sys/proc_info.h>
#include <sys/sysctl.h>
#include <libproc.h>
#endif
@ -427,6 +428,8 @@ static void readProcfsRoots(const Path & storeDir, UncheckedRoots & unchecked)
#ifdef __APPLE__
static void readLibprocRoots(const Path & storeDir, UncheckedRoots & unchecked)
{
auto storePathRegex = std::regex(quoteRegexChars(storeDir) + R"(/[0-9a-z]+[0-9a-zA-Z\+\-\._\?=]*)");
int pidBufSize = proc_listpids(PROC_ALL_PIDS, 0, nullptr, 0);
if (pidBufSize <= 0 || pidBufSize % sizeof(int) != 0)
throw SysError("Listing PIDs");
@ -497,12 +500,40 @@ static void readLibprocRoots(const Path & storeDir, UncheckedRoots & unchecked)
if ((errno == ESRCH) || (errno == EINVAL) || (errno == EPERM)) break;
throw SysError("Getting pid %1% region path", pid);
}
unchecked[std::string(regionInfo.prp_vip.vip_path)].emplace("{libproc/region}");
nextAddr = regionInfo.prp_prinfo.pri_address + regionInfo.prp_prinfo.pri_size;
}
// Arguments and environment variables
// We can't read environment variables of binaries with with entitlements unless
// nix has the `com.apple.private.read-environment-variables` entitlement or SIP is off
// We can read arguments for all applications though.
// Yes, it's a sysctl, the proc_info and sysctl APIs are mostly similar,
// but both have exclusive capabilities
// We don't care about what is args and what is environment so we could use
// KERN_PROCARGS, but KERN_PROCARGS2 saves about 20ms in my testing
int sysctlName[3] = {CTL_KERN, KERN_PROCARGS2, pid};
size_t argsSize = 0;
if (sysctl(sysctlName, 3, nullptr, &argsSize, nullptr, 0) < 0) {
throw SysError("Reading pid %1% arguments");
}
std::vector<char> args(argsSize);
if (sysctl(sysctlName, 3, args.data(), &argsSize, nullptr, 0) < 0) {
throw SysError("Reading pid %1% arguments");
}
if (argsSize < args.size())
args.resize(argsSize);
auto env_end = std::sregex_iterator{};
for (auto i = std::sregex_iterator{args.begin(), args.end(), storePathRegex}; i != env_end; ++i)
unchecked[i->str()].emplace("{libproc/args}");
// TODO: per-thread cwds (apparently exist but I don't see them much)
}