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Kernel/LibC: Implement all chown family function with fchownat

This commit is contained in:
Bananymous 2024-09-17 18:35:01 +03:00
parent 4aa466b948
commit e431e90b20
4 changed files with 49 additions and 9 deletions
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2
kernel/include/kernel/Process.h
View File

@ -114,7 +114,7 @@ namespace Kernel
BAN::ErrorOr<long> sys_pread(int fd, void* buffer, size_t count, off_t offset);
BAN::ErrorOr<long> sys_fchmodat(int fd, const char* path, mode_t mode, int flag);
BAN::ErrorOr<long> sys_chown(const char* path, uid_t uid, gid_t gid);
BAN::ErrorOr<long> sys_fchownat(int fd, const char* path, uid_t uid, gid_t gid, int flag);
BAN::ErrorOr<long> sys_socket(int domain, int type, int protocol);
BAN::ErrorOr<long> sys_getsockname(int socket, sockaddr* address, socklen_t* address_len);

37
kernel/kernel/Process.cpp
View File

@ -1062,14 +1062,39 @@ namespace Kernel
return 0;
}
BAN::ErrorOr<long> Process::sys_chown(const char* path, uid_t uid, gid_t gid)
BAN::ErrorOr<long> Process::sys_fchownat(int fd, const char* path, uid_t uid, gid_t gid, int flag)
{
LockGuard _(m_process_lock);
TRY(validate_string_access(path));
if (flag & ~AT_SYMLINK_NOFOLLOW)
return BAN::Error::from_errno(EINVAL);
if (flag == AT_SYMLINK_NOFOLLOW)
flag = O_NOFOLLOW;
auto absolute_path = TRY(absolute_path_of(path));
auto file = TRY(VirtualFileSystem::get().file_from_absolute_path(m_credentials, absolute_path, O_WRONLY));
TRY(file.inode->chown(uid, gid));
LockGuard _(m_process_lock);
if (path)
TRY(validate_string_access(path));
VirtualFileSystem::File parent_file;
if (path && path[0] == '/')
parent_file = VirtualFileSystem::get().root_file();
else if (fd == AT_FDCWD)
parent_file = TRY(m_working_directory.clone());
else
parent_file = TRY(m_open_file_descriptors.file_of(fd));
auto inode = path
? TRY(VirtualFileSystem::get().file_from_relative_path(parent_file, m_credentials, path, flag)).inode
: parent_file.inode;
if (uid != -1 && !m_credentials.is_superuser())
return BAN::Error::from_errno(EPERM);
if (gid != -1 && !m_credentials.is_superuser() && (m_credentials.euid() != uid || !m_credentials.has_egid(gid)))
return BAN::Error::from_errno(EPERM);
if (uid == -1)
uid = inode->uid();
if (gid == -1)
gid = inode->gid();
TRY(inode->chown(uid, gid));
return 0;
}

2
userspace/libraries/LibC/include/sys/syscall.h
View File

@ -57,7 +57,7 @@ __BEGIN_DECLS
O(SYS_READLINKAT, readlinkat) \
O(SYS_MSYNC, msync) \
O(SYS_PREAD, pread) \
O(SYS_CHOWN, chown) \
O(SYS_FCHOWNAT, fchownat) \
O(SYS_LOAD_KEYMAP, load_keymap) \
O(SYS_SOCKET, socket) \
O(SYS_BIND, bind) \

17
userspace/libraries/LibC/unistd.cpp
View File

@ -315,7 +315,22 @@ int chdir(const char* path)
int chown(const char* path, uid_t owner, gid_t group)
{
return syscall(SYS_CHOWN, path, owner, group);
return fchownat(AT_FDCWD, path, owner, group, 0);
}
int lchown(const char* path, uid_t owner, gid_t group)
{
return fchownat(AT_FDCWD, path, owner, group, AT_SYMLINK_NOFOLLOW);
}
int fchown(int fildes, uid_t owner, gid_t group)
{
return fchownat(fildes, nullptr, owner, group, 0);
}
int fchownat(int fd, const char* path, uid_t owner, gid_t group, int flag)
{
return syscall(SYS_FCHOWNAT, fd, path, owner, group, flag);
}
void sync(void)