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Kernel: Expose a process's filesystem root as a /proc/PID/root symlink

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In order to preserve the absolute path of the process root, we save the
custody used by chroot() before stripping it to become the new "/".
There's probably a better way to do this.
This commit is contained in:
Andreas Kling 2020-01-10 23:48:44 +01:00
parent 3f9e4cd24e
commit 29b3d95004
3 changed files with 21 additions and 0 deletions
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11
Kernel/FileSystem/ProcFS.cpp
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@ -80,6 +80,7 @@ enum ProcFileType {
FI_PID_fds,
FI_PID_exe, // symlink
FI_PID_cwd, // symlink
FI_PID_root, // symlink
FI_PID_fd, // directory
__FI_PID_End,
@ -571,6 +572,14 @@ Optional<KBuffer> procfs$pid_cwd(InodeIdentifier identifier)
return handle->process().current_directory().absolute_path().to_byte_buffer();
}
Optional<KBuffer> procfs$pid_root(InodeIdentifier identifier)
{
auto handle = ProcessInspectionHandle::from_pid(to_pid(identifier));
if (!handle)
return {};
return handle->process().root_directory_for_procfs().absolute_path().to_byte_buffer();
}
Optional<KBuffer> procfs$self(InodeIdentifier)
{
char buffer[16];
@ -1030,6 +1039,7 @@ InodeMetadata ProcFSInode::metadata() const
break;
case FI_PID_cwd:
case FI_PID_exe:
case FI_PID_root:
metadata.mode = 0120400;
break;
case FI_Root:
@ -1408,6 +1418,7 @@ ProcFS::ProcFS()
m_entries[FI_PID_fds] = { "fds", FI_PID_fds, false, procfs$pid_fds };
m_entries[FI_PID_exe] = { "exe", FI_PID_exe, false, procfs$pid_exe };
m_entries[FI_PID_cwd] = { "cwd", FI_PID_cwd, false, procfs$pid_cwd };
m_entries[FI_PID_root] = { "root", FI_PID_root, false, procfs$pid_root };
m_entries[FI_PID_fd] = { "fd", FI_PID_fd, false };
}