Yes this bug was causing the GraalVM example not to work with the isolates.
Missing I-node numbers in procfs was another part. GraalVM reads maps file to
find where it’s code was mapped to.
Sent from my iPhone
> On Jun 30, 2019, at 04:53, Nadav Har'El <n...@scylladb.com> wrote:
>
> Hi, thanks, I committed this patch because indeed the mprotect manual pages,
> in both Linux and posix, both talk about (possible) errors if addr is not
> aligned, but keep suspiciously silent about len. But I'm curious, how did you
> find this issue? Did it break actual code that tried to use unaligned length?
>
>> On Sat, Jun 29, 2019 at 7:07 AM Waldemar Kozaczuk <jwkozac...@gmail.com>
>> wrote:
>> Signed-off-by: Waldemar Kozaczuk <jwkozac...@gmail.com>
>> ---
>> libc/mman.cc | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/libc/mman.cc b/libc/mman.cc
>> index 73a3f416..bb573a80 100644
>> --- a/libc/mman.cc
>> +++ b/libc/mman.cc
>> @@ -88,11 +88,12 @@ int mprotect(void *addr, size_t len, int prot)
>> abort("mprotect() on linear map not supported\n");
>> }
>>
>> - if (!mmu::is_page_aligned(addr) || !mmu::is_page_aligned(len)) {
>> + if (!mmu::is_page_aligned(addr)) {
>> // address not page aligned
>> return libc_error(EINVAL);
>> }
>>
>> + len = align_up(len, mmu::page_size);
>> return mmu::mprotect(addr, len, libc_prot_to_perm(prot)).to_libc();
>> }
>>
>> --
>> 2.20.1
>>
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