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Kernel/Graphics: Handle correctly unknown ioctls on a DisplayConnector

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In such case, we should not assert but instead just return EINVAL.
This commit is contained in:
Liav A 2022-10-23 14:02:57 +03:00 • committed by Gunnar Beutner
parent e2ebc8826f
commit e3de568a45
2 changed files with 11 additions and 6 deletions
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15
Kernel/Graphics/DisplayConnector.cpp
View file

@ -250,16 +250,17 @@ static StringView ioctl_to_stringview(unsigned request)
if (checker.ioctl_number == request) if (checker.ioctl_number == request)
return checker.name; return checker.name;
} }
VERIFY_NOT_REACHED(); return "unknown"sv;
} }
bool DisplayConnector::ioctl_requires_ownership(unsigned request) const ErrorOr<bool> DisplayConnector::ioctl_requires_ownership(unsigned request) const
{ {
for (auto& checker : s_checkers) { for (auto& checker : s_checkers) {
if (checker.ioctl_number == request) if (checker.ioctl_number == request)
return checker.requires_ownership; return checker.requires_ownership;
} }
VERIFY_NOT_REACHED(); // Note: In case of unknown ioctl, return EINVAL.
return Error::from_errno(EINVAL);
} }
ErrorOr<void> DisplayConnector::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) ErrorOr<void> DisplayConnector::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
@ -269,7 +270,8 @@ ErrorOr<void> DisplayConnector::ioctl(OpenFileDescription&, unsigned request, Us
// Note: We only allow to set responsibility on a DisplayConnector, // Note: We only allow to set responsibility on a DisplayConnector,
// get the current ModeSetting or the hardware framebuffer properties without the // get the current ModeSetting or the hardware framebuffer properties without the
// need of having an established responsibility on a DisplayConnector. // need of having an established responsibility on a DisplayConnector.
if (ioctl_requires_ownership(request)) { auto needs_ownership = TRY(ioctl_requires_ownership(request));
if (needs_ownership) {
auto process = m_responsible_process.strong_ref(); auto process = m_responsible_process.strong_ref();
if (!process || process.ptr() != &Process::current()) { if (!process || process.ptr() != &Process::current()) {
dbgln("DisplayConnector::ioctl: {} requires ownership over the device", ioctl_to_stringview(request)); dbgln("DisplayConnector::ioctl: {} requires ownership over the device", ioctl_to_stringview(request));
@ -459,7 +461,10 @@ ErrorOr<void> DisplayConnector::ioctl(OpenFileDescription&, unsigned request, Us
return {}; return {};
} }
} }
return EINVAL; // Note: We already verify that the IOCTL is supported and not unknown in
// the call to the ioctl_requires_ownership method, so if we reached this
// section of the code, this is bug.
VERIFY_NOT_REACHED();
} }
} }

2
Kernel/Graphics/DisplayConnector.h
View file

@ -148,7 +148,7 @@ private:
virtual void will_be_destroyed() override; virtual void will_be_destroyed() override;
virtual void after_inserting() override; virtual void after_inserting() override;
bool ioctl_requires_ownership(unsigned request) const; ErrorOr<bool> ioctl_requires_ownership(unsigned request) const;
OwnPtr<Memory::Region> m_framebuffer_region; OwnPtr<Memory::Region> m_framebuffer_region;
OwnPtr<Memory::Region> m_fake_writes_framebuffer_region; OwnPtr<Memory::Region> m_fake_writes_framebuffer_region;