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shm: memfd_create: fallback to not using MFD_NOEXEC_SEAL

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MFD_NOEXEC_SEAL was introduced in linux 6.3. Kernels before that
will *reject* memfd_create() calls that set it.

This caused foot to exit (i.e. not start at all), when compiled on
linux >= 6.3, but run on linux < 6.3.

We _do_ want to use MFD_NOEXEC_SEAL, since a) our memory mapped really
shouldn't be executable, and b) to silence a warning on linux >= 6.3.

To handle all cases, first try *with* MFD_NOEXEC_SEAL. If that fails
with EINVAL, retry *without* it.

Closes #1514
This commit is contained in:
Daniel Eklöf 2023-10-12 16:16:11 +02:00
parent 7d7b48f104
commit c006ac3a07
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2 changed files with 21 additions and 5 deletions
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CHANGELOG.md
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@ -53,6 +53,11 @@
### Deprecated
### Removed
### Fixed
* Foot not starting on linux kernels before 6.3 ([#1514][1514]).
[1514]: https://codeberg.org/dnkl/foot/issues/1514
### Security
### Contributors