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Kernel: Use the Syscall string and buffer types more

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While I was updating syscalls to stop passing null-terminated strings,
I added some helpful struct types:

    - StringArgument { const char*; size_t; }
    - ImmutableBuffer<Data, Size> { const Data*; Size; }
    - MutableBuffer<Data, Size> { Data*; Size; }

The Process class has some convenience functions for validating and
optionally extracting the contents from these structs:

    - get_syscall_path_argument(StringArgument)
    - validate_and_copy_string_from_user(StringArgument)
    - validate(ImmutableBuffer)
    - validate(MutableBuffer)

There's still so much code around this and I'm wondering if we should
generate most of it instead. Possible nice little project.
This commit is contained in:
Andreas Kling 2020-01-11 12:47:47 +01:00
parent 1434f30f92
commit 24c736b0e7
8 changed files with 148 additions and 121 deletions
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12
Libraries/LibC/fcntl.cpp
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@ -33,22 +33,30 @@ int creat_with_path_length(const char* path, size_t path_length, mode_t mode)
int open_with_path_length(const char* path, size_t path_length, int options, mode_t mode)
{
if (!path) {
errno = EFAULT;
return -1;
}
if (path_length > INT32_MAX) {
errno = EINVAL;
return -1;
}
Syscall::SC_open_params params { path, (int)path_length, options, mode };
Syscall::SC_open_params params { { path, path_length }, options, mode };
int rc = syscall(SC_open, &params);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int openat_with_path_length(int dirfd, const char* path, size_t path_length, int options, mode_t mode)
{
if (!path) {
errno = EFAULT;
return -1;
}
if (path_length > INT32_MAX) {
errno = EINVAL;
return -1;
}
Syscall::SC_openat_params params { dirfd, path, (int)path_length, options, mode };
Syscall::SC_openat_params params { dirfd, { path, path_length }, options, mode };
int rc = syscall(SC_openat, &params);
__RETURN_WITH_ERRNO(rc, rc, -1);
}