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Kernel: Add /proc/<pid>/exe

This commit is contained in:
Bananymous 2025-08-26 13:22:30 +03:00
parent e4abe75043
commit abbe7b79d6
3 changed files with 20 additions and 0 deletions
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3
kernel/include/kernel/Process.h
View File

@ -226,6 +226,8 @@ namespace Kernel
size_t proc_cmdline(off_t offset, BAN::ByteSpan) const;
size_t proc_environ(off_t offset, BAN::ByteSpan) const;
BAN::StringView executable() const { return m_executable; }
// Returns error if page could not be allocated
// Returns true if the page was allocated successfully
// Return false if access was page violation (segfault)
@ -339,6 +341,7 @@ namespace Kernel
BAN::Vector<BAN::String> m_cmdline;
BAN::Vector<BAN::String> m_environ;
BAN::String m_executable;
BAN::Vector<ChildExitStatus> m_child_exit_statuses;
ThreadBlocker m_child_exit_blocker;

11
kernel/kernel/FS/ProcFS/Inode.cpp
View File

@ -18,6 +18,16 @@ namespace Kernel
TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_cmdline, fs, 0400)), "cmdline"_sv));
TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_environ, fs, 0400)), "environ"_sv));
TRY(inode->link_inode(*MUST(ProcSymlinkInode::create_new(
[](void* process) -> BAN::ErrorOr<BAN::String>
{
BAN::String result;
TRY(result.append(static_cast<Process*>(process)->executable()));
return result;
},
&process, fs, 0400, process.credentials().ruid(), process.credentials().ruid()
)), "exe"_sv));
return inode;
}
@ -32,6 +42,7 @@ namespace Kernel
(void)TmpDirectoryInode::unlink_impl("meminfo"_sv);
(void)TmpDirectoryInode::unlink_impl("cmdline"_sv);
(void)TmpDirectoryInode::unlink_impl("environ"_sv);
(void)TmpDirectoryInode::unlink_impl("exe"_sv);
}
BAN::ErrorOr<BAN::RefPtr<ProcROProcessInode>> ProcROProcessInode::create_new(Process& process, size_t (Process::*callback)(off_t, BAN::ByteSpan) const, TmpFileSystem& fs, mode_t mode)

6
kernel/kernel/Process.cpp
View File

@ -132,6 +132,8 @@ namespace Kernel
auto executable = TRY(ELF::load_from_inode(process->m_root_file.inode, executable_inode, process->m_credentials, process->page_table()));
process->m_mapped_regions = BAN::move(executable.regions);
TRY(process->m_executable.append(executable_file.canonical_path));
if (executable_inode->mode().mode & +Inode::Mode::ISUID)
process->m_credentials.set_euid(executable_inode->uid());
if (executable_inode->mode().mode & +Inode::Mode::ISGID)
@ -672,6 +674,9 @@ namespace Kernel
auto executable = TRY(ELF::load_from_inode(m_root_file.inode, executable_inode, m_credentials, *new_page_table));
auto new_mapped_regions = BAN::move(executable.regions);
BAN::String executable_path;
TRY(executable_path.append(executable_file.canonical_path));
BAN::Vector<LibELF::AuxiliaryVector> auxiliary_vector;
TRY(auxiliary_vector.reserve(1 + executable.open_execfd));
@ -756,6 +761,7 @@ namespace Kernel
m_cmdline = BAN::move(str_argv);
m_environ = BAN::move(str_envp);
m_executable = BAN::move(executable_path);
}
m_has_called_exec = true;