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GH-9370: Fix opcache jit protection bits. #9371

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GH-9370: Fix opcache jit protection bits. #9371

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devnexen
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Allow mprotect to occur, pthread_jit_write_np are just to allow mprotect
flags to be used.

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phpGH-9370: Fix opcache jit protection bits.
5372a1d 
Allow mprotect to occur, pthread_jit_write_np are just to allow mprotect
 flags to be used.
@devnexen devnexen requested a review from dstogov August 19, 2022 04:37
cmb69
cmb69 approved these changes Aug 19, 2022
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Thank you! Looks good to me.

dstogov
dstogov reviewed Aug 22, 2022
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I cannot test this, but according to https://keith.github.io/xcode-man-pages/pthread_jit_write_protect_np.3.html pthread_jit_write_protect_np() should work without mprotect().

May be mprotect() is necessary, because we used it before in zend_accel_shared_protect(). Also note that we seem don't use MAP_JIT flag and this may make difference.

@cmb69 cmb69 mentioned this pull request Aug 22, 2022
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@jdp1024 would the new changes work for you ?

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jdp1024 commented Aug 24, 2022

@jdp1024 would the new changes work for you ?

It doesn't work in M1. Call to mprotect seems necessary.

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devnexen commented Aug 24, 2022 •
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Ok thx, I m going to put those back.

Could you try again once you get a chance pls ?

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jdp1024 commented Aug 24, 2022

Ok thx, I m going to put those back.

Could you try again once you get a chance pls ?

mmap() with MAP_JIT along with the removal of two returns worked.

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Ok waiting for @dstogov approval.

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dstogov commented Aug 24, 2022

mmap() with MAP_JIT along with the removal of two returns worked.

Does PHP work without the patch (with returns)?

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jdp1024 commented Aug 24, 2022 •
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mmap() with MAP_JIT along with the removal of two returns worked.

Does PHP work without the patch (with returns)?

It works after the removal of the two returns (without MAP_JIT).

It does not work with MAP_JIT while keeping the two returns.

So it seems that the mprotect calls are necessary in M1 machines.

dstogov
dstogov approved these changes Aug 24, 2022
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OK. Merge this.

@devnexen devnexen closed this in e787d9a Aug 24, 2022
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