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Kernel: Add unveil('b')

Browse source 
This is a new "browse" permission that lets you open (and subsequently list
contents of) directories underneath the path, but not regular files or any other
types of files.
This commit is contained in:
Sergey Bugaev 2020-11-21 22:55:20 +03:00 • committed by Andreas Kling
parent 23dc3ff0c2
commit 098070b767
Notes: sideshowbarker 2024-07-19 01:17:40 +09:00
5 changed files with 30 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

24
Kernel/FileSystem/VirtualFileSystem.cpp
View file

@ -825,7 +825,13 @@ const UnveiledPath* VFS::find_matching_unveiled_path(StringView path)
for (auto& unveiled_path : Process::current()->unveiled_paths()) {
if (path == unveiled_path.path)
return &unveiled_path;
if (path.starts_with(unveiled_path.path) && path.length() > unveiled_path.path.length() && path[unveiled_path.path.length()] == '/')
if (!path.starts_with(unveiled_path.path))
continue;
// /foo/ and /foo/bar
if (unveiled_path.path.ends_with('/'))
return &unveiled_path;
// /foo and /foo/bar
if (path.length() > unveiled_path.path.length() && path[unveiled_path.path.length()] == '/')
return &unveiled_path;
}
return nullptr;
@ -863,10 +869,18 @@ KResult VFS::validate_path_against_process_veil(StringView path, int options)
return KSuccess;
}
if (options & O_RDONLY) {
if (!(unveiled_path->permissions & UnveiledPath::Access::Read)) {
dbg() << "Rejecting path '" << path << "' since it hasn't been unveiled with 'r' permission.";
dump_backtrace();
return KResult(-EACCES);
if (options & O_DIRECTORY) {
if (!(unveiled_path->permissions & (UnveiledPath::Access::Read | UnveiledPath::Access::Browse))) {
dbg() << "Rejecting path '" << path << "' since it hasn't been unveiled with 'r' or 'b' permissions.";
dump_backtrace();
return KResult(-EACCES);
}
} else {
if (!(unveiled_path->permissions & UnveiledPath::Access::Read)) {
dbg() << "Rejecting path '" << path << "' since it hasn't been unveiled with 'r' permission.";
dump_backtrace();
return KResult(-EACCES);
}
}
}
if (options & O_WRONLY) {