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Kernel/LibC: Implement setreuid

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This commit is contained in:
Jesse Buhagiar 2021-04-09 21:13:15 +10:00 • committed by Andreas Kling
parent 81eab1a9d1
commit 60cdbc9397
5 changed files with 34 additions and 0 deletions
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1
Kernel/API/Syscall.h
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@ -79,6 +79,7 @@ namespace Kernel {
S(setegid) \
S(setuid) \
S(setgid) \
S(setreuid) \
S(setresuid) \
S(setresgid) \
S(alarm) \

1
Kernel/Process.h
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@ -324,6 +324,7 @@ public:
KResultOr<int> sys$setegid(gid_t);
KResultOr<int> sys$setuid(uid_t);
KResultOr<int> sys$setgid(gid_t);
KResultOr<int> sys$setreuid(uid_t, uid_t);
KResultOr<int> sys$setresuid(uid_t, uid_t, uid_t);
KResultOr<int> sys$setresgid(gid_t, gid_t, gid_t);
KResultOr<unsigned> sys$alarm(unsigned seconds);

25
Kernel/Syscalls/setuid.cpp
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@ -73,6 +73,31 @@ KResultOr<int> Process::sys$setgid(gid_t new_gid)
return 0;
}
KResultOr<int> Process::sys$setreuid(uid_t new_ruid, uid_t new_euid)
{
REQUIRE_PROMISE(id);
if (new_ruid == (uid_t)-1)
new_ruid = uid();
if (new_euid == (uid_t)-1)
new_euid = euid();
auto ok = [this](uid_t id) { return id == uid() || id == euid() || id == suid(); };
if (!ok(new_ruid) || !ok(new_euid))
return EPERM;
if (new_ruid < (uid_t)-1 || new_euid < (uid_t)-1)
return EINVAL;
if (euid() != new_euid)
set_dumpable(false);
ProtectedDataMutationScope scope { *this };
m_uid = new_ruid;
m_euid = new_euid;
return 0;
}
KResultOr<int> Process::sys$setresuid(uid_t new_ruid, uid_t new_euid, uid_t new_suid)
{
REQUIRE_PROMISE(id);