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ProcFS: Add /proc/PID/unveil

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This file exposes a JSON array of all the unveiled paths in a process.
This commit is contained in:
Andreas Kling
2020-01-20 22:19:02 +01:00
parent 0569123ad7
commit 02406b7305
1 changed files with 28 additions and 0 deletions
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28
Kernel/FileSystem/ProcFS.cpp
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@@ -104,6 +104,7 @@ enum ProcFileType {
FI_PID_stack,
FI_PID_regs,
FI_PID_fds,
FI_PID_unveil,
FI_PID_exe, // symlink
FI_PID_cwd, // symlink
FI_PID_root, // symlink
@@ -544,6 +545,32 @@ Optional<KBuffer> procfs$pid_vmobjects(InodeIdentifier identifier)
return builder.build();
}
Optional<KBuffer> procfs$pid_unveil(InodeIdentifier identifier)
{
auto handle = ProcessInspectionHandle::from_pid(to_pid(identifier));
if (!handle)
return {};
auto& process = handle->process();
KBufferBuilder builder;
JsonArraySerializer array { builder };
for (auto& unveiled_path : process.unveiled_paths()) {
auto obj = array.add_object();
obj.add("path", unveiled_path.path);
StringBuilder permissions_builder;
if (unveiled_path.permissions & UnveiledPath::Access::Read)
permissions_builder.append('r');
if (unveiled_path.permissions & UnveiledPath::Access::Write)
permissions_builder.append('w');
if (unveiled_path.permissions & UnveiledPath::Access::Execute)
permissions_builder.append('x');
if (unveiled_path.permissions & UnveiledPath::Access::CreateOrRemove)
permissions_builder.append('c');
obj.add("permissions", permissions_builder.to_string());
}
array.finish();
return builder.build();
}
Optional<KBuffer> procfs$pid_stack(InodeIdentifier identifier)
{
auto handle = ProcessInspectionHandle::from_pid(to_pid(identifier));
@@ -1569,6 +1596,7 @@ ProcFS::ProcFS()
m_entries[FI_PID_fds] = { "fds", FI_PID_fds, false, procfs$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_unveil] = { "unveil", FI_PID_unveil, false, procfs$pid_unveil };
m_entries[FI_PID_root] = { "root", FI_PID_root, false, procfs$pid_root };
m_entries[FI_PID_fd] = { "fd", FI_PID_fd, false };
}