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Kernel: Make copy_{from,to}_user() return KResult and use TRY()

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This makes EFAULT propagation flow much more naturally. :^)
This commit is contained in:
Andreas Kling 2021-09-05 17:38:37 +02:00
parent 9903f5c6ef
commit 48a0b31c47
57 changed files with 318 additions and 551 deletions
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20
Kernel/Syscalls/getuid.cpp
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@ -40,18 +40,20 @@ KResultOr<FlatPtr> Process::sys$getresuid(Userspace<UserID*> ruid, Userspace<Use
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
REQUIRE_PROMISE(stdio);
if (!copy_to_user(ruid, &m_protected_values.uid) || !copy_to_user(euid, &m_protected_values.euid) || !copy_to_user(suid, &m_protected_values.suid))
return EFAULT;
return 0;
TRY(copy_to_user(ruid, &m_protected_values.uid));
TRY(copy_to_user(euid, &m_protected_values.euid));
TRY(copy_to_user(suid, &m_protected_values.suid));
return KSuccess;
}
KResultOr<FlatPtr> Process::sys$getresgid(Userspace<GroupID*> rgid, Userspace<GroupID*> egid, Userspace<GroupID*> sgid)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
REQUIRE_PROMISE(stdio);
if (!copy_to_user(rgid, &m_protected_values.gid) || !copy_to_user(egid, &m_protected_values.egid) || !copy_to_user(sgid, &m_protected_values.sgid))
return EFAULT;
return 0;
TRY(copy_to_user(rgid, &m_protected_values.gid));
TRY(copy_to_user(egid, &m_protected_values.egid));
TRY(copy_to_user(sgid, &m_protected_values.sgid));
return KSuccess;
}
KResultOr<FlatPtr> Process::sys$getgroups(size_t count, Userspace<gid_t*> user_gids)
@ -62,11 +64,7 @@ KResultOr<FlatPtr> Process::sys$getgroups(size_t count, Userspace<gid_t*> user_g
return extra_gids().size();
if (count != extra_gids().size())
return EINVAL;
if (!copy_to_user(user_gids, extra_gids().data(), sizeof(gid_t) * count))
return EFAULT;
return 0;
return copy_to_user(user_gids, extra_gids().data(), sizeof(gid_t) * count);
}
}