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From: w6b7rk5yu4mt25v3 <w6b7rk5yu4mt25v3@protonmail.com>
Subject: Re: Why do these mprotect always fail?
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Almost forgot, PAGE_SIZE is set to 4096. This is a Linux application, when =
I compile on Cygwin it complained that PAGE_SIZE is redefined but the compi=
lation was success nevertheless. Only when I run the application, I always =
exited with "Unable to mprotect".

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------- Original Message -------
On Wednesday, February 15th, 2023 at 16:38, w6b7rk5yu4mt25v3 <w6b7rk5yu4mt2=
5v3@protonmail.com> wrote:


> mprotect 1:
>=20
> unsigned char* buffer;
> int32_t available, size;
>=20
> if(size > PAGE_SIZE) {
>=20
> factor =3D size / PAGE_SIZE + 1;
> }
> available =3D factor * PAGE_SIZE;
>=20
> if(posix_memalign((void**)&buffer, PAGE_SIZE, available)) {
> std::wcerr << L"Unable to allocate JIT memory!" << std::endl;
> exit(1);
> }
> if(mprotect(buffer, available, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) {
> std::wcerr << L"Unable to mprotect" << std::endl;
> exit(1);
> }
>=20
> mprotect 2:
>=20
> if(posix_memalign((void**)& buffer, PAGE_SIZE, PAGE_SIZE)) {
> std::wcerr << L"Unable to allocate JIT memory!" << std::endl;
> exit(1);
> }
>=20
> if(mprotect(buffer, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) {
> std::wcerr << L"Unable to mprotect" << std::endl;
> exit(1);
> }
>=20
>=20
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