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Kernel+Userland: Implement setuid() and setgid() and add /bin/su

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Also show setuid and setgid bits in "ls -l" output. :^)
This commit is contained in:
Andreas Kling 2019-02-21 23:35:07 +01:00
parent 6071a77e8e
commit 920e8e58ed
9 changed files with 79 additions and 8 deletions
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23
Kernel/Process.cpp
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@ -411,6 +411,11 @@ int Process::do_exec(String path, Vector<String> arguments, Vector<String> envir
m_initial_arguments = move(arguments);
m_initial_environment = move(environment);
if (descriptor->metadata().is_setuid())
m_euid = descriptor->metadata().uid;
if (descriptor->metadata().is_setgid())
m_egid = descriptor->metadata().gid;
#ifdef TASK_DEBUG
kprintf("Process %u (%s) exec'd %s @ %p\n", pid(), name().characters(), path.characters(), m_tss.eip);
#endif
@ -1352,14 +1357,22 @@ int Process::sys$killpg(int pgrp, int signum)
ASSERT_NOT_REACHED();
}
int Process::sys$setuid(uid_t)
int Process::sys$setuid(uid_t uid)
{
ASSERT_NOT_REACHED();
if (uid != m_uid && !is_superuser())
return -EPERM;
m_uid = uid;
m_euid = uid;
return 0;
}
int Process::sys$setgid(gid_t)
int Process::sys$setgid(gid_t gid)
{
ASSERT_NOT_REACHED();
if (gid != m_gid && !is_superuser())
return -EPERM;
m_gid = gid;
m_egid = gid;
return 0;
}
unsigned Process::sys$alarm(unsigned seconds)
@ -1900,7 +1913,7 @@ int Process::sys$getgroups(int count, gid_t* gids)
int Process::sys$setgroups(size_t count, const gid_t* gids)
{
if (!is_root())
if (!is_superuser())
return -EPERM;
if (count >= MAX_PROCESS_GIDS)
return -EINVAL;

2
Kernel/Process.h
View file

@ -283,7 +283,7 @@ public:
Process* fork(RegisterDump&);
int exec(String path, Vector<String> arguments, Vector<String> environment);
bool is_root() const { return m_euid == 0; }
bool is_superuser() const { return m_euid == 0; }
bool wakeup_requested() { return m_wakeup_requested; }
void request_wakeup() { m_wakeup_requested = true; }

5
Kernel/sync.sh
View file

@ -32,7 +32,10 @@ ln -s /proc/self/fd/0 mnt/dev/stdin
ln -s /proc/self/fd/1 mnt/dev/stdout
ln -s /proc/self/fd/2 mnt/dev/stderr
cp -vR ../Base/* mnt/
mkdir mnt/home/anon
mkdir mnt/home/nona
chown -vR 100:100 mnt/home/anon
chown -vR 200:200 mnt/home/nona
cp -v ../Userland/sh mnt/bin/sh
cp -v ../Userland/id mnt/bin/id
cp -v ../Userland/ps mnt/bin/ps
@ -65,6 +68,8 @@ cp -v ../Userland/chmod mnt/bin/chmod
cp -v ../Userland/top mnt/bin/top
cp -v ../Userland/ln mnt/bin/ln
cp -v ../Userland/df mnt/bin/df
cp -v ../Userland/su mnt/bin/su
chmod 4755 mnt/bin/su
cp -v ../Applications/Terminal/Terminal mnt/bin/Terminal
cp -v ../Applications/FontEditor/FontEditor mnt/bin/FontEditor
cp -v ../Applications/Launcher/Launcher mnt/bin/Launcher