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Kernel+LibC: Implement setregid(2)

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This copies and adapts the setresgid syscall, following in the footsteps
of setreuid and setresuid.
This commit is contained in:
sin-ack 2022-10-01 12:47:38 +00:00 • committed by Andrew Kaster
parent 2a502fe232
commit 70337f3a4b
5 changed files with 43 additions and 0 deletions
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34
Kernel/Syscalls/setuid.cpp
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@ -206,6 +206,40 @@ ErrorOr<FlatPtr> Process::sys$setresuid(UserID new_ruid, UserID new_euid, UserID
});
}
ErrorOr<FlatPtr> Process::sys$setregid(GroupID new_rgid, GroupID new_egid)
{
VERIFY_NO_PROCESS_BIG_LOCK(this);
TRY(require_promise(Pledge::id));
return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
auto credentials = this->credentials();
if (new_rgid == (gid_t)-1)
new_rgid = credentials->gid();
if (new_egid == (gid_t)-1)
new_egid = credentials->egid();
auto ok = [&credentials](GroupID id) { return id == credentials->gid() || id == credentials->egid() || id == credentials->sgid(); };
if (!ok(new_rgid) || !ok(new_egid))
return EPERM;
auto new_credentials = TRY(Credentials::create(
credentials->uid(),
new_rgid,
credentials->euid(),
new_egid,
credentials->suid(),
credentials->sgid(),
credentials->extra_gids()));
if (credentials->egid() != new_egid)
protected_data.dumpable = false;
protected_data.credentials = move(new_credentials);
return 0;
});
}
ErrorOr<FlatPtr> Process::sys$setresgid(GroupID new_rgid, GroupID new_egid, GroupID new_sgid)
{
VERIFY_NO_PROCESS_BIG_LOCK(this);