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Kernel: Expose command line and environment to /proc

This commit is contained in:
Bananymous 2023-09-30 23:01:33 +03:00
parent 797ca65c66
commit b712c70c75
4 changed files with 94 additions and 40 deletions
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9
kernel/include/kernel/FS/ProcFS/Inode.h
View File

@ -20,11 +20,11 @@ namespace Kernel
Process& m_process;
};
class ProcMemInode final : public RamInode
class ProcROInode final : public RamInode
{
public:
static BAN::ErrorOr<BAN::RefPtr<ProcMemInode>> create(Process&, RamFileSystem&, mode_t, uid_t, gid_t);
~ProcMemInode() = default;
static BAN::ErrorOr<BAN::RefPtr<ProcROInode>> create(Process&, size_t (Process::*callback)(off_t, void*, size_t) const, RamFileSystem&, mode_t, uid_t, gid_t);
~ProcROInode() = default;
protected:
virtual BAN::ErrorOr<size_t> read_impl(off_t, void*, size_t) override;
@ -35,10 +35,11 @@ namespace Kernel
virtual bool has_data_impl() const override { return true; }
private:
ProcMemInode(Process&, RamFileSystem&, const FullInodeInfo&);
ProcROInode(Process&, size_t (Process::*)(off_t, void*, size_t) const, RamFileSystem&, const FullInodeInfo&);
private:
Process& m_process;
size_t (Process::*m_callback)(off_t, void*, size_t) const;
};
}

7
kernel/include/kernel/Process.h
View File

@ -139,7 +139,9 @@ namespace Kernel
PageTable& page_table() { return m_page_table ? *m_page_table : PageTable::kernel(); }
void get_meminfo(proc_meminfo_t*) const;
size_t proc_meminfo(off_t offset, void* buffer, size_t buffer_size) const;
size_t proc_cmdline(off_t offset, void* buffer, size_t buffer_size) const;
size_t proc_environ(off_t offset, void* buffer, size_t buffer_size) const;
bool is_userspace() const { return m_is_userspace; }
const userspace_info_t& userspace_info() const { return m_userspace_info; }
@ -192,6 +194,9 @@ namespace Kernel
vaddr_t m_signal_handlers[_SIGMAX + 1] { };
uint64_t m_signal_pending_mask { 0 };
BAN::Vector<BAN::String> m_cmdline;
BAN::Vector<BAN::String> m_environ;
bool m_is_userspace { false };
userspace_info_t m_userspace_info;
ExitStatus m_exit_status;

24
kernel/kernel/FS/ProcFS/Inode.cpp
View File

@ -12,7 +12,9 @@ namespace Kernel
return BAN::Error::from_errno(ENOMEM);
auto inode = BAN::RefPtr<ProcPidInode>::adopt(inode_ptr);
TRY(inode->add_inode("meminfo"sv, MUST(ProcMemInode::create(process, fs, 0755, 0, 0))));
TRY(inode->add_inode("meminfo"sv, MUST(ProcROInode::create(process, &Process::proc_meminfo, fs, 0755, 0, 0))));
TRY(inode->add_inode("cmdline"sv, MUST(ProcROInode::create(process, &Process::proc_cmdline, fs, 0755, 0, 0))));
TRY(inode->add_inode("environ"sv, MUST(ProcROInode::create(process, &Process::proc_environ, fs, 0755, 0, 0))));
return inode;
}
@ -23,36 +25,30 @@ namespace Kernel
{
}
BAN::ErrorOr<BAN::RefPtr<ProcMemInode>> ProcMemInode::create(Process& process, RamFileSystem& fs, mode_t mode, uid_t uid, gid_t gid)
BAN::ErrorOr<BAN::RefPtr<ProcROInode>> ProcROInode::create(Process& process, size_t (Process::*callback)(off_t, void*, size_t) const, RamFileSystem& fs, mode_t mode, uid_t uid, gid_t gid)
{
FullInodeInfo inode_info(fs, mode, uid, gid);
auto* inode_ptr = new ProcMemInode(process, fs, inode_info);
auto* inode_ptr = new ProcROInode(process, callback, fs, inode_info);
if (inode_ptr == nullptr)
return BAN::Error::from_errno(ENOMEM);
return BAN::RefPtr<ProcMemInode>::adopt(inode_ptr);
return BAN::RefPtr<ProcROInode>::adopt(inode_ptr);
}
ProcMemInode::ProcMemInode(Process& process, RamFileSystem& fs, const FullInodeInfo& inode_info)
ProcROInode::ProcROInode(Process& process, size_t (Process::*callback)(off_t, void*, size_t) const, RamFileSystem& fs, const FullInodeInfo& inode_info)
: RamInode(fs, inode_info)
, m_process(process)
, m_callback(callback)
{
m_inode_info.mode |= Inode::Mode::IFREG;
}
BAN::ErrorOr<size_t> ProcMemInode::read_impl(off_t offset, void* buffer, size_t buffer_size)
BAN::ErrorOr<size_t> ProcROInode::read_impl(off_t offset, void* buffer, size_t buffer_size)
{
ASSERT(offset >= 0);
if ((size_t)offset >= sizeof(proc_meminfo_t))
return 0;
proc_meminfo_t meminfo;
m_process.get_meminfo(&meminfo);
size_t bytes = BAN::Math::min<size_t>(buffer_size, sizeof(meminfo) - offset);
memcpy(buffer, &meminfo, bytes);
return bytes;
return (m_process.*m_callback)(offset, buffer, buffer_size);
}
}

92
kernel/kernel/Process.cpp
View File

@ -119,6 +119,9 @@ namespace Kernel
MUST(process->m_working_directory.push_back('/'));
process->m_page_table = BAN::UniqPtr<PageTable>::adopt(MUST(PageTable::create_userspace()));
TRY(process->m_cmdline.push_back({}));
TRY(process->m_cmdline.back().append(path));
process->m_loadable_elf = TRY(load_elf_for_exec(credentials, path, "/"sv, process->page_table()));
process->m_loadable_elf->reserve_address_space();
@ -252,29 +255,75 @@ namespace Kernel
thread->set_terminating();
}
void Process::get_meminfo(proc_meminfo_t* out) const
size_t Process::proc_meminfo(off_t offset, void* buffer, size_t buffer_size) const
{
ASSERT(offset >= 0);
if ((size_t)offset >= sizeof(proc_meminfo_t))
return 0;
proc_meminfo_t meminfo;
meminfo.page_size = PAGE_SIZE;
meminfo.virt_pages = 0;
meminfo.phys_pages = 0;
{
LockGuard _(m_lock);
for (auto* thread : m_threads)
{
meminfo.virt_pages += thread->virtual_page_count();
meminfo.phys_pages += thread->physical_page_count();
}
for (auto& region : m_mapped_regions)
{
meminfo.virt_pages += region->virtual_page_count();
meminfo.phys_pages += region->physical_page_count();
}
if (m_loadable_elf)
{
meminfo.virt_pages += m_loadable_elf->virtual_page_count();
meminfo.phys_pages += m_loadable_elf->physical_page_count();
}
}
size_t bytes = BAN::Math::min<size_t>(sizeof(proc_meminfo_t) - offset, buffer_size);
memcpy(buffer, (uint8_t*)&meminfo + offset, bytes);
return bytes;
}
static size_t read_from_vec_of_str(const BAN::Vector<BAN::String>& container, size_t start, void* buffer, size_t buffer_size)
{
size_t offset = 0;
size_t written = 0;
for (const auto& elem : container)
{
if (start < offset + elem.size() + 1)
{
size_t elem_offset = 0;
if (offset < start)
elem_offset = start - offset;
size_t bytes = BAN::Math::min<size_t>(elem.size() + 1 - elem_offset, buffer_size - written);
memcpy((uint8_t*)buffer + written, elem.data() + elem_offset, bytes);
written += bytes;
if (written >= buffer_size)
break;
}
offset += elem.size() + 1;
}
return written;
}
size_t Process::proc_cmdline(off_t offset, void* buffer, size_t buffer_size) const
{
LockGuard _(m_lock);
return read_from_vec_of_str(m_cmdline, offset, buffer, buffer_size);
}
out->page_size = PAGE_SIZE;
out->virt_pages = 0;
out->phys_pages = 0;
for (auto* thread : m_threads)
{
out->virt_pages += thread->virtual_page_count();
out->phys_pages += thread->physical_page_count();
}
for (auto& region : m_mapped_regions)
{
out->virt_pages += region->virtual_page_count();
out->phys_pages += region->physical_page_count();
}
if (m_loadable_elf)
{
out->virt_pages += m_loadable_elf->virtual_page_count();
out->phys_pages += m_loadable_elf->physical_page_count();
}
size_t Process::proc_environ(off_t offset, void* buffer, size_t buffer_size) const
{
LockGuard _(m_lock);
return read_from_vec_of_str(m_environ, offset, buffer, buffer_size);
}
BAN::ErrorOr<long> Process::sys_exit(int status)
@ -464,6 +513,9 @@ namespace Kernel
m_userspace_info.argc = str_argv.size();
m_cmdline = BAN::move(str_argv);
m_environ = BAN::move(str_envp);
asm volatile("cli");
}