execmem_restore_rox(9)

💅 execmem_restore_rox — like, the un-writable-ing function

okay bestie, buckle up, because this little cutie lives in the Kernel API Manual (execmem_restore_rox(9)) and it is genuinely one of the most straightforward glow-ups in the whole execmem friend group. no cap. 🫶

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✨ SYNOPSIS ✨

int execmem_restore_rox (void *ptr , size_t size );

that's it. two args. she's low maintenance. 🎀

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🌸 ARGUMENTS 🌸

• ptr — the address of the region you wanna remap, bestie. literally just where the thing starts. 📍
• size — how big that region is, i.e. the size of the region to remap. don't skip this one, she matters. 📏

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🦋 DESCRIPTION 🦋

so here's the tea ☕ — this function restores read-only-execute permissions on the range [ptr, ptr + size) after that range was temporarily remapped as writable. yes, temporarily. we were just borrowing the write bit, we promise. 🙈

it relies on the architecture implementation of set_memory_rox to restore the mapping, and it does that using large pages. iconic behaviour honestly. 👑

so the vibe is: someone made it writable for a hot sec, did their little thing, and now execmem_restore_rox is here to put the ROX permissions back on like a bestie fixing your hair before a photo. 📸✨

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🔥 RETURN 🔥

• 0 on success 🎉
• a negative error code on failure 😭

like, that's it. binary vibes. either we slayed or we didn't.

ngl bestie, always check the return value. 0 is the green flag, anything negative is a red flag fr fr. 🚩

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💜 SEE ALSO 💜

all the other execmem besties, in the Kernel file ./include/linux/execmem.h:

• enum execmem_type(9)
• enum execmem_range_flags(9)
• execmem_fill_trapping_insns(9)
• struct execmem_range(9)
• struct execmem_info(9)
• execmem_arch_setup(9)
• execmem_alloc(9)
• execmem_alloc_rw(9)
• execmem_free(9)
• execmem_vmap(9)
• execmem_is_rox(9)

go read them. all of them. iykyk. 📚💅

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and that's the whole page, bestie — written under ./include/linux, dated October 2026, and honestly? she ate. 🌈⭐ bye pookie, go fix those permissions 🫶💖