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https://github.com/RGBCube/serenity
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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/KSyms.h>
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#include <Kernel/Process.h>
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#include <Kernel/UserOrKernelBuffer.h>
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#include <Kernel/kstdio.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$dump_backtrace()
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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dump_backtrace();
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return 0;
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}
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KResultOr<FlatPtr> Process::sys$dbgputch(u8 ch)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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dbgputch(ch);
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return 0;
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}
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KResultOr<FlatPtr> Process::sys$dbgputstr(Userspace<const u8*> characters, size_t size)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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if (size == 0)
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return 0;
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if (size <= 1024) {
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char buffer[1024];
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if (!copy_from_user(buffer, characters, size))
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return EFAULT;
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dbgputstr(buffer, size);
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return size;
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}
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auto result = try_copy_kstring_from_user(reinterpret_cast<char const*>(characters.unsafe_userspace_ptr()), size);
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if (result.is_error())
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return result.error();
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dbgputstr(result.value()->characters(), size);
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return size;
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}
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}
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