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https://github.com/RGBCube/serenity
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Kernel: Add sid and pgid to Credentials
There are places in the kernel that would like to have access to `pgid` credentials in certain circumstances. I haven't found any use cases for `sid` yet, but `sid` and `pgid` are both changed with `sys$setpgid`, so it seemed sensical to add it. In Linux, `man 7 credentials` also mentions both the session id and process group id, so this isn't unprecedented.
This commit is contained in:
yyny
Andreas Kling
parent
456a8436b5
commit
9ca979846c
6 changed files with 62 additions and 18 deletions
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@ -10,13 +10,13 @@
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namespace Kernel {
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ErrorOr<NonnullRefPtr<Credentials>> Credentials::create(UserID uid, GroupID gid, UserID euid, GroupID egid, UserID suid, GroupID sgid, Span<GroupID const> extra_gids)
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ErrorOr<NonnullRefPtr<Credentials>> Credentials::create(UserID uid, GroupID gid, UserID euid, GroupID egid, UserID suid, GroupID sgid, Span<GroupID const> extra_gids, SessionID sid, ProcessGroupID pgid)
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{
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auto extra_gids_array = TRY(FixedArray<GroupID>::try_create(extra_gids));
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return adopt_nonnull_ref_or_enomem(new (nothrow) Credentials(uid, gid, euid, egid, suid, sgid, move(extra_gids_array)));
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return adopt_nonnull_ref_or_enomem(new (nothrow) Credentials(uid, gid, euid, egid, suid, sgid, move(extra_gids_array), sid, pgid));
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}
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Credentials::Credentials(UserID uid, GroupID gid, UserID euid, GroupID egid, UserID suid, GroupID sgid, FixedArray<GroupID> extra_gids)
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Credentials::Credentials(UserID uid, GroupID gid, UserID euid, GroupID egid, UserID suid, GroupID sgid, FixedArray<GroupID> extra_gids, SessionID sid, ProcessGroupID pgid)
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: m_uid(uid)
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, m_gid(gid)
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, m_euid(euid)
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@ -24,6 +24,8 @@ Credentials::Credentials(UserID uid, GroupID gid, UserID euid, GroupID egid, Use
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, m_suid(suid)
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, m_sgid(sgid)
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, m_extra_gids(move(extra_gids))
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, m_sid(sid)
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, m_pgid(pgid)
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{
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}
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@ -14,7 +14,7 @@ namespace Kernel {
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class Credentials final : public AtomicRefCounted<Credentials> {
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public:
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static ErrorOr<NonnullRefPtr<Credentials>> create(UserID uid, GroupID gid, UserID euid, GroupID egid, UserID suid, GroupID sgid, Span<GroupID const> extra_gids);
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static ErrorOr<NonnullRefPtr<Credentials>> create(UserID uid, GroupID gid, UserID euid, GroupID egid, UserID suid, GroupID sgid, Span<GroupID const> extra_gids, SessionID sid, ProcessGroupID pgid);
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~Credentials();
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bool is_superuser() const { return euid() == 0; }
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@ -26,11 +26,13 @@ public:
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UserID suid() const { return m_suid; }
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GroupID sgid() const { return m_sgid; }
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Span<GroupID const> extra_gids() const { return m_extra_gids.span(); }
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SessionID sid() const { return m_sid; };
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ProcessGroupID pgid() const { return m_pgid; }
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bool in_group(GroupID) const;
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private:
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Credentials(UserID uid, GroupID gid, UserID euid, GroupID egid, UserID suid, GroupID sgid, FixedArray<GroupID> extra_gids);
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Credentials(UserID uid, GroupID gid, UserID euid, GroupID egid, UserID suid, GroupID sgid, FixedArray<GroupID> extra_gids, SessionID sid, ProcessGroupID pgid);
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UserID m_uid;
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GroupID m_gid;
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@ -39,6 +41,8 @@ private:
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UserID m_suid;
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GroupID m_sgid;
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FixedArray<GroupID> m_extra_gids;
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SessionID m_sid;
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ProcessGroupID m_pgid;
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};
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}
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@ -311,7 +311,7 @@ ErrorOr<NonnullLockRefPtr<Process>> Process::try_create(LockRefPtr<Thread>& firs
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}
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auto unveil_tree = UnveilNode { TRY(KString::try_create("/"sv)), UnveilMetadata(TRY(KString::try_create("/"sv))) };
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auto exec_unveil_tree = UnveilNode { TRY(KString::try_create("/"sv)), UnveilMetadata(TRY(KString::try_create("/"sv))) };
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auto credentials = TRY(Credentials::create(uid, gid, uid, gid, uid, gid, {}));
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auto credentials = TRY(Credentials::create(uid, gid, uid, gid, uid, gid, {}, fork_parent ? fork_parent->sid() : 0, fork_parent ? fork_parent->pgid() : 0));
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auto process = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Process(move(name), move(credentials), ppid, is_kernel_process, move(current_directory), move(executable), tty, move(unveil_tree), move(exec_unveil_tree))));
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TRY(process->attach_resources(new_address_space.release_nonnull(), first_thread, fork_parent));
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return process;
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@ -540,7 +540,9 @@ ErrorOr<void> Process::do_exec(NonnullLockRefPtr<OpenFileDescription> main_progr
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new_egid,
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new_suid,
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new_sgid,
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old_credentials->extra_gids()));
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old_credentials->extra_gids(),
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old_credentials->sid(),
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old_credentials->pgid()));
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}
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}
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@ -120,7 +120,23 @@ ErrorOr<FlatPtr> Process::sys$setpgid(pid_t specified_pid, pid_t specified_pgid)
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}
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// FIXME: There are more EPERM conditions to check for here..
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process->m_pg = TRY(ProcessGroup::try_find_or_create(new_pgid));
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return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
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auto credentials = this->credentials();
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auto new_credentials = TRY(Credentials::create(
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credentials->uid(),
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credentials->gid(),
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credentials->euid(),
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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credentials->extra_gids(),
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new_sid,
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new_pgid));
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protected_data.credentials = move(new_credentials);
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return 0;
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});
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}
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}
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@ -30,7 +30,9 @@ ErrorOr<FlatPtr> Process::sys$seteuid(UserID new_euid)
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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credentials->extra_gids()));
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credentials->extra_gids(),
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credentials->sid(),
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credentials->pgid()));
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if (credentials->euid() != new_euid)
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protected_data.dumpable = false;
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@ -61,7 +63,9 @@ ErrorOr<FlatPtr> Process::sys$setegid(GroupID new_egid)
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new_egid,
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credentials->suid(),
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credentials->sgid(),
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credentials->extra_gids()));
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credentials->extra_gids(),
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credentials->sid(),
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credentials->pgid()));
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if (credentials->egid() != new_egid)
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protected_data.dumpable = false;
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@ -92,7 +96,9 @@ ErrorOr<FlatPtr> Process::sys$setuid(UserID new_uid)
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credentials->egid(),
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new_uid,
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credentials->sgid(),
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credentials->extra_gids()));
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credentials->extra_gids(),
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credentials->sid(),
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credentials->pgid()));
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if (credentials->euid() != new_uid)
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protected_data.dumpable = false;
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@ -123,7 +129,9 @@ ErrorOr<FlatPtr> Process::sys$setgid(GroupID new_gid)
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new_gid,
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credentials->suid(),
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new_gid,
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credentials->extra_gids()));
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credentials->extra_gids(),
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credentials->sid(),
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credentials->pgid()));
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if (credentials->egid() != new_gid)
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protected_data.dumpable = false;
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@ -160,7 +168,9 @@ ErrorOr<FlatPtr> Process::sys$setreuid(UserID new_ruid, UserID new_euid)
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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credentials->extra_gids()));
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credentials->extra_gids(),
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credentials->sid(),
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credentials->pgid()));
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if (credentials->euid() != new_euid)
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protected_data.dumpable = false;
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@ -196,7 +206,9 @@ ErrorOr<FlatPtr> Process::sys$setresuid(UserID new_ruid, UserID new_euid, UserID
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credentials->egid(),
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new_suid,
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credentials->sgid(),
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credentials->extra_gids()));
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credentials->extra_gids(),
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credentials->sid(),
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credentials->pgid()));
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if (credentials->euid() != new_euid)
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protected_data.dumpable = false;
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@ -230,7 +242,9 @@ ErrorOr<FlatPtr> Process::sys$setregid(GroupID new_rgid, GroupID new_egid)
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new_egid,
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credentials->suid(),
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credentials->sgid(),
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credentials->extra_gids()));
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credentials->extra_gids(),
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credentials->sid(),
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credentials->pgid()));
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if (credentials->egid() != new_egid)
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protected_data.dumpable = false;
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@ -266,7 +280,9 @@ ErrorOr<FlatPtr> Process::sys$setresgid(GroupID new_rgid, GroupID new_egid, Grou
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new_egid,
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credentials->suid(),
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new_sgid,
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credentials->extra_gids()));
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credentials->extra_gids(),
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credentials->sid(),
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credentials->pgid()));
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if (credentials->egid() != new_egid)
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protected_data.dumpable = false;
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@ -298,7 +314,9 @@ ErrorOr<FlatPtr> Process::sys$setgroups(size_t count, Userspace<GroupID const*>
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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{}));
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{},
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credentials->sid(),
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credentials->pgid()));
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return 0;
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}
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@ -324,7 +342,9 @@ ErrorOr<FlatPtr> Process::sys$setgroups(size_t count, Userspace<GroupID const*>
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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new_extra_gids.span()));
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new_extra_gids.span(),
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credentials->sid(),
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credentials->pgid()));
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return 0;
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});
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}
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