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6830963321a4cfdd951e29ecb0f92a2cc3ddd166
ladybird/Kernel
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Brian Gianforcaro 6830963321 Kernel: Validate we don't hold s_mm_lock during context switch 
Since `s_mm_lock` is a RecursiveSpinlock, if a kernel thread gets
preempted while accidentally hold the lock during switch_context,
another thread running on the same processor could end up manipulating
the state of the memory manager even though they should not be able to.
It will just bump the recursion count and keep going.

This appears to be the root cause of weird bugs like: #7359
Where page protection magically appears to be wrong during execution.

To avoid these cases lets guard this specific unfortunate case and make
sure it can never go unnoticed ever again.

The assert was Tom's idea to help debug this, so I am going to tag him
as co-author of this commit.

Co-Authored-By: Tom <tomut@yahoo.com>
2021-05-25 10:35:41 +02:00
..
ACPI
Kernel/ACPI: Map two pages when reading the FADT
2021-05-08 19:15:54 +02:00
API
Kernel: Add statvfs & fstatvfs Syscalls
2021-05-19 21:33:29 +02:00
Arch
Kernel/CPU: Fix awkward printing early on boot
2021-05-21 22:38:26 +01:00
Devices
Kernel: Process request to change virtual console from the IO Work queue
2021-05-21 08:08:33 +02:00
FileSystem
Kernel: Remove an allocation from VFS::resolve_path_without_veil (#7287)
2021-05-22 00:12:32 +02:00
Graphics
Kernel/Graphics: Indicate initialization failed if no device was found
2021-05-21 17:58:53 +01:00
Heap
Kernel: Add support for profiling kmalloc()/kfree()
2021-05-19 22:51:42 +02:00
Interrupts
Kernel: Add Processor::is_bootstrap_processor() function, and use it. (#6871)
2021-05-05 18:48:26 +02:00
Modules
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
Net
Kernel/Net: Make interfaces to have persistent names
2021-05-22 11:19:50 +01:00
PCI
Kernel/PCI: Fix support of multiple PCI host controllers enumeration
2021-05-21 17:58:53 +01:00
Storage
Kernel: Don't ref-count UsedMemoryRange during iteration
2021-05-16 19:58:33 +02:00
Syscalls
Kernel: Disable profiling if setting up the buffer or timer failed
2021-05-24 09:10:50 +02:00
Tasks
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
Time
Kernel: Fix return value for {enable,disable}_profile_timer()
2021-05-17 21:53:04 +02:00
TTY
LibVT: Add Alternate Screen Buffer support
2021-05-24 22:26:54 +04:30
VirtIO
Kernel: Reorder VirtIODevice PCI initialization steps
2021-05-15 23:29:03 +01:00
VM
Kernel: Release the paging lock while reading from the disk
2021-05-25 10:35:41 +02:00
AddressSanitizer.cpp
Everywhere: Use bgianf@serenityos.org for my copyright attribution
2021-04-22 21:15:54 +02:00
AddressSanitizer.h
Everywhere: Use bgianf@serenityos.org for my copyright attribution
2021-04-22 21:15:54 +02:00
Assertions.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
CMakeLists.txt
Meta: Make generate_state_machine() generate a proper target
2021-05-20 12:11:27 +01:00
CMOS.cpp
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
CMOS.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
CommandLine.cpp
Kernel/Commandline: Allow the user to specify an embedded string
2021-05-21 22:38:26 +01:00
CommandLine.h
Kernel/Commandline: Allow the user to specify an embedded string
2021-05-21 22:38:26 +01:00
ConsoleDevice.cpp
Kernel: Rename Console => ConsoleDevice
2021-05-16 19:58:33 +02:00
ConsoleDevice.h
Kernel: Rename Console => ConsoleDevice
2021-05-16 19:58:33 +02:00
CoreDump.cpp
Everywhere: Use linusg@serenityos.org for my copyright headers
2021-04-22 22:51:19 +02:00
CoreDump.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
Debug.h.in
Kernel/Graphics + SystemServer: Support text mode properly
2021-05-16 19:58:33 +02:00
DMI.cpp
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
DMI.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
DoubleBuffer.cpp
Kernel: Don't update write_pos in DoubleBuffer if userspace copy fails
2021-05-18 16:47:26 +02:00
DoubleBuffer.h
Kernel: Implement peek() function for DoubleBuffer
2021-04-29 08:09:53 +02:00
Forward.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
FutexQueue.cpp
Everywhere: Use "the SerenityOS developers." in copyright headers
2021-04-29 00:59:26 +02:00
FutexQueue.h
Everywhere: Use "the SerenityOS developers." in copyright headers
2021-04-29 00:59:26 +02:00
init.cpp
Kernel+LibC: Add support for filtering profiling events
2021-05-19 22:51:42 +02:00
IO.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
KBuffer.h
Kernel: Make KBuffer::try_create_with* APIs OOM safe
2021-05-13 16:21:53 +02:00
KBufferBuilder.cpp
Kernel: Replace make<T>() with adopt_own_if_nonnull() in KBufferBuilder
2021-05-13 16:21:53 +02:00
KBufferBuilder.h
Kernel: Avoid allocations in KBufferBuilder::appendff
2021-05-13 08:27:42 +02:00
kprintf.cpp
Kernel: Implement a PCI Serial Device driver
2021-05-17 18:15:25 +02:00
KResult.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
kstdio.h
Kernel/Graphics + SystemServer: Support text mode properly
2021-05-16 19:58:33 +02:00
KSyms.cpp
Kernel: Check kernel symbol's name length matches searched name
2021-04-28 22:14:32 +02:00
KSyms.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
linker.ld
Kernel: Define a KERNEL_VIRTUAL_BASE in the linker script
2021-03-04 18:25:01 +01:00
Lock.cpp
Kernel: Utilize AK::SourceLocation for LOCK_DEBUG instrumentation.
2021-04-25 09:38:27 +02:00
Lock.h
Kernel: Add ScopedLockRelease to temporarily release a Lock
2021-05-25 10:35:41 +02:00
LockMode.h
Everywhere: Use "the SerenityOS developers." in copyright headers
2021-04-29 00:59:26 +02:00
mkmap.sh
…
Module.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
Multiboot.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
Panic.cpp
Kernel/Graphics + SystemServer: Support text mode properly
2021-05-16 19:58:33 +02:00
Panic.h
Kernel/Graphics + SystemServer: Support text mode properly
2021-05-16 19:58:33 +02:00
PerformanceEventBuffer.cpp
Kernel: Generate page fault events from the kernel profiler
2021-05-19 22:51:42 +02:00
PerformanceEventBuffer.h
Kernel: Add support for profiling kmalloc()/kfree()
2021-05-19 22:51:42 +02:00
PerformanceManager.h
Kernel: Make sure we only log profiling events when m_profiling is true
2021-05-23 23:54:30 +01:00
PhysicalAddress.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
Process.cpp
Kernel: Print a message to debug log after writing a perfcore file
2021-05-22 22:23:52 +02:00
Process.h
Kernel: Make sure we only log profiling events when m_profiling is true
2021-05-23 23:54:30 +01:00
ProcessGroup.cpp
Revert "Kernel: Avoid allocating under spinlock in ProcessGroup::find_or_create"
2021-05-21 12:36:20 +02:00
ProcessGroup.h
Revert "Kernel: Avoid allocating under spinlock in ProcessGroup::find_or_create"
2021-05-21 12:36:20 +02:00
Random.cpp
Kernel: Remove the now defunct LOCKER(..) macro.
2021-04-25 09:38:27 +02:00
Random.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
RTC.cpp
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
RTC.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
Scheduler.cpp
Kernel: Validate we don't hold s_mm_lock during context switch
2021-05-25 10:35:41 +02:00
Scheduler.h
Kernel: Add support for profiling kmalloc()/kfree()
2021-05-19 22:51:42 +02:00
SpinLock.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
StdLib.cpp
Kernel: Enable building the kernel with -flto
2021-04-29 20:26:36 +02:00
StdLib.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
Syscall.cpp
Kernel: Enable building the kernel with -flto
2021-04-29 20:26:36 +02:00
Thread.cpp
Kernel: Close a Thread tid lookup race
2021-05-20 22:08:36 +02:00
Thread.h
Kernel: Remove an allocation when blocking a thread
2021-05-20 09:09:10 +02:00
ThreadBlockers.cpp
Kernel: Modify TimeManagement::current_time(..) API so it can't fail. (#6869)
2021-05-05 18:51:06 +02:00
ThreadTracer.cpp
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
ThreadTracer.h
Kernel: Make Process::start_tracing_from API OOM safe
2021-05-13 16:21:53 +02:00
TimerQueue.cpp
Kernel: Remove an allocation when blocking a thread
2021-05-20 09:09:10 +02:00
TimerQueue.h
Kernel: Remove an allocation when blocking a thread
2021-05-20 09:09:10 +02:00
UBSanitizer.cpp
Kernel: static vs non-static constexpr variables
2021-05-19 21:21:47 +01:00
UBSanitizer.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
UnixTypes.h
Kernel: Generate page fault events from the kernel profiler
2021-05-19 22:51:42 +02:00
UnveilNode.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
UserOrKernelBuffer.cpp
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
UserOrKernelBuffer.h
Kernel: Make UserOrKernelBuffer R/W helpers return KResultOr<size_t>
2021-05-13 23:28:40 +02:00
VirtualAddress.h
Everything: Move to SPDX license identifiers in all files.
2021-04-22 11:22:27 +02:00
WaitQueue.cpp
Everywhere: Use "the SerenityOS developers." in copyright headers
2021-04-29 00:59:26 +02:00
WaitQueue.h
Everywhere: Use "the SerenityOS developers." in copyright headers
2021-04-29 00:59:26 +02:00
WorkQueue.cpp
Kernel: Use plain Function objects for the WorkQueue
2021-05-19 21:36:57 +02:00
WorkQueue.h
Kernel: Use plain Function objects for the WorkQueue
2021-05-19 21:36:57 +02:00