Verified Commit 58029802 authored by Julius Athenstaedt's avatar Julius Athenstaedt Committed by Marc Vef
Browse files

Add system call: listxattr family

parent 477005cd

include/client/hooks.hpp

+8 −0
Original line number Diff line number Diff line
@@ -214,6 +214,14 @@ hook_fallocate(int fd, int mode, off_t offset, off_t len); 
int

hook_fadvise64(int fd, off_t offset, off_t len, int advice);



// char * list is nullable (_Nullable - Clang extension)

ssize_t

hook_listxattr(const char* path, char* list, size_t size);

ssize_t

hook_llistxattr(const char* path, char* list, size_t size);

ssize_t

hook_flistxattr(int fd, char* list, size_t size);



} // namespace gkfs::hook



#endif

src/client/hooks.cpp

+40 −0
Original line number Diff line number Diff line
@@ -1019,5 +1019,45 @@ hook_fadvise64(int fd, off_t offset, off_t len, int advice) { 
    return syscall_no_intercept_wrapper(SYS_fadvise64, fd, offset, len, advice);

}



ssize_t

hook_listxattr(const char* path, char* list, size_t size) {



    LOG(DEBUG, "{}() called with path '{}' list '{}' size '{}'", __func__, path,

        list, size);



    std::string rel_path;

    if(CTX->relativize_path(path, rel_path)) {

        return -ENOTSUP;

    }

    return syscall_no_intercept_wrapper(SYS_listxattr, path, list, size);

}



ssize_t

hook_llistxattr(const char* path, char* list, size_t size) {



    LOG(DEBUG, "{}() called with path '{}' list '{}' size '{}'", __func__, path,

        list, size);



    std::string rel_path;

    if(CTX->relativize_path(path, rel_path)) {

        return -ENOTSUP;

    }

    return syscall_no_intercept_wrapper(SYS_llistxattr, path, list, size);

}



ssize_t

hook_flistxattr(int fd, char* list, size_t size) {



    LOG(DEBUG, "{}() called with filedescriptor '{}' list '{}' size '{}'",

        __func__, fd, list, size);



    const char* newpath_path;

    std::string newpath_resolved;

    auto newpath_status =

            CTX->relativize_fd_path(fd, newpath_path, newpath_resolved);

    if(newpath_status == gkfs::preload::RelativizeStatus::internal) {

        return -ENOTSUP;

    }

    return syscall_no_intercept_wrapper(SYS_flistxattr, fd, list, size);

}

} // namespace gkfs::hook

src/client/intercept.cpp

+21 −0
Original line number Diff line number Diff line
@@ -784,6 +784,27 @@ hook(long syscall_number, long arg0, long arg1, long arg2, long arg3, long arg4, 
                    reinterpret_cast<const char*>(arg1),

                    reinterpret_cast<void*>(arg2), static_cast<size_t>(arg4));

            break;

#ifdef SYS_listxattr

        case SYS_listxattr:

            *result = gkfs::hook::hook_listxattr(

                    reinterpret_cast<const char*>(arg0),

                    reinterpret_cast<char*>(arg1), static_cast<size_t>(arg2));

            break;

#endif

#ifdef SYS_llistxattr

        case SYS_llistxattr:

            *result = gkfs::hook::hook_llistxattr(

                    reinterpret_cast<const char*>(arg0),

                    reinterpret_cast<char*>(arg1), static_cast<size_t>(arg2));

            break;

#endif

#ifdef SYS_flistxattr

        case SYS_flistxattr:

            *result = gkfs::hook::hook_flistxattr(reinterpret_cast<long>(arg0),

                                                  reinterpret_cast<char*>(arg1),

                                                  static_cast<size_t>(arg2));

            break;

#endif



        case SYS_lgetxattr:

            *result = gkfs::hook::hook_lgetxattr(