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ladybird/Kernel/Syscalls/uname.cpp

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Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-31 00:38:15 +03:00
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
2021-04-22 11:24:48 +03:00
* SPDX-License-Identifier: BSD-2-Clause
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-31 00:38:15 +03:00
*/
#include <Kernel/Process.h>
namespace Kernel {
Kernel: Replace KResult and KResultOr<T> with Error and ErrorOr<T> We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
2021-11-08 02:51:39 +03:00
ErrorOr<FlatPtr> Process::sys$uname(Userspace<utsname*> user_buf)
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-31 00:38:15 +03:00
{
Kernel: Disable big process lock for sys$uname()
2021-07-18 21:27:41 +03:00
VERIFY_NO_PROCESS_BIG_LOCK(this)
Kernel: Handle promise violations in the syscall handler Previously we would crash the process immediately when a promise violation was found during a syscall. This is error prone, as we don't unwind the stack. This means that in certain cases we can leak resources, like an OwnPtr / RefPtr tracked on the stack. Or even leak a lock acquired in a ScopeLockLocker. To remedy this situation we move the promise violation handling to the syscall handler, right before we return to user space. This allows the code to follow the normal unwind path, and grantees there is no longer any cleanup that needs to occur. The Process::require_promise() and Process::require_no_promises() functions were modified to return ErrorOr<void> so we enforce that the errors are always propagated by the caller.
2021-12-29 12:11:45 +03:00
TRY(require_promise(Pledge::stdio));
Kernel: Use Userspace<T> for the uname syscall
2020-08-09 23:02:27 +03:00
Kernel: Don't dereference untrusted userspace pointer in sys$uname() Instead of writing to the userspace utsname struct one field at a time, build up a utsname on the kernel stack and copy it out to userspace once it's finished. This is both simpler and gets validity checking built-in for free. Found by KUBSAN! :^) Fixes #5499.
2021-02-24 16:33:50 +03:00
utsname buf {};
memcpy(buf.sysname, "SerenityOS", 11);
memcpy(buf.release, "1.0-dev", 8);
memcpy(buf.version, "FIXME", 6);
Kernel: Report correct architecture for uname()
2021-06-29 20:19:35 +03:00
#if ARCH(I386)
Kernel: Don't dereference untrusted userspace pointer in sys$uname() Instead of writing to the userspace utsname struct one field at a time, build up a utsname on the kernel stack and copy it out to userspace once it's finished. This is both simpler and gets validity checking built-in for free. Found by KUBSAN! :^) Fixes #5499.
2021-02-24 16:33:50 +03:00
memcpy(buf.machine, "i686", 5);
Kernel: Report correct architecture for uname()
2021-06-29 20:19:35 +03:00
#else
memcpy(buf.machine, "x86_64", 7);
#endif
Kernel: Migrate hostname locking to ProtectedValue
2021-07-18 16:00:48 +03:00
hostname().with_shared([&](const auto& name) {
Kernel: Fix OOB write in sys$uname Since this was only out of bounds of the specific field, not of the whole struct, and because setting the hostname requires root privileges this was not actually a security vulnerability.
2022-01-13 01:30:58 +03:00
auto length = min(name->length(), UTSNAME_ENTRY_LEN - 1);
memcpy(buf.nodename, name->characters(), length);
buf.nodename[length] = '\0';
Kernel: Migrate hostname locking to ProtectedValue
2021-07-18 16:00:48 +03:00
});
Kernel: Don't dereference untrusted userspace pointer in sys$uname() Instead of writing to the userspace utsname struct one field at a time, build up a utsname on the kernel stack and copy it out to userspace once it's finished. This is both simpler and gets validity checking built-in for free. Found by KUBSAN! :^) Fixes #5499.
2021-02-24 16:33:50 +03:00
Kernel: Replace KResult and KResultOr<T> with Error and ErrorOr<T> We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
2021-11-08 02:51:39 +03:00
TRY(copy_to_user(user_buf, &buf));
return 0;
Kernel: Move syscall implementations out of Process.cpp This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
2020-07-31 00:38:15 +03:00
}
}
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