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Kernel: Don't include null terminator in sys$readlink() result

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POSIX says, "Conforming applications should not assume that the returned
contents of the symbolic link are null-terminated."

If we do include the null terminator into the returning string, Python
believes it to actually be a part of the returned name, and gets unhappy
about that later. This suggests other systems Python runs in don't include
it, so let's do that too.

Also, make our userspace support non-null-terminated realpath().
This commit is contained in:
Sergey Bugaev
2020-04-14 18:39:56 +03:00
committed by Andreas Kling
parent 1dee4d0049
commit f18d6610d3
3 changed files with 11 additions and 8 deletions
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6
Kernel/Process.cpp
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@@ -1950,10 +1950,10 @@ int Process::sys$readlink(const Syscall::SC_readlink_params* user_params)
return -EIO; // FIXME: Get a more detailed error from VFS.
auto link_target = String::copy(contents);
if (link_target.length() + 1 > params.buffer.size)
if (link_target.length() > params.buffer.size)
return -ENAMETOOLONG;
copy_to_user(params.buffer.data, link_target.characters(), link_target.length() + 1);
return link_target.length() + 1;
copy_to_user(params.buffer.data, link_target.characters(), link_target.length());
return link_target.length();
}
int Process::sys$chdir(const char* user_path, size_t path_length)