vmalloc_user(9)

💖 vmalloc_user 💖

okay so bestie, we're in vmalloc_user(9) territory — welcome to the Kernel API Manual, section 9, the place where all the memory magic happens ✨ buckle up 🎀

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🌸 NAME 🌸

vmalloc_user — allocate zeroed virtually contiguous memory for userspace 🫶

like, it hands you memory that looks all nice and contiguous, and it's already zeroed so you can yeet it at userspace without spilling your kernel secrets 💅

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✨ SYNOPSIS ✨

void * vmalloc_user (unsigned long size );

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🦋 ARGUMENTS 🦋

• size — the allocation size, aka how much memory you're asking for, no cap 📏

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💜 DESCRIPTION 💜

The resulting memory area is zeroed so it can be mapped to userspace without leaking data 🔥

fr fr, that zeroing is the whole point — without it you'd be leaking kernel data straight into userspace and that's not the vibe 💀

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🌈 RETURN 🌈

pointer to the allocated memory or NULL on error — so like, always check it, bestie 🙈

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⭐ SEE ALSO ⭐

Kernel file ./mm/vmalloc.c — that's where all the source lives 👑

and the whole friend group of related functions, all of them, in order, no one left out:

• vunmap_range(9)
• vmap_pages_range(9)
• vm_area_map_pages(9)
• vm_area_unmap_pages(9)
• new_vmap_block(9)
• vm_unmap_aliases(9)
• vm_unmap_ram(9)
• vm_map_ram(9)
• vm_area_add_early(9)
• vm_area_register_early(9)
• get_vm_area(9)
• find_vm_area(9)
• remove_vm_area(9)
• vfree_atomic(9)
• vfree(9)
• vunmap(9)
• vmap(9)
• vmap_pfn(9)
• __vmalloc_node_range(9)
• __vmalloc_node(9)
• vmalloc(9)
• vmalloc_huge_node(9)
• vzalloc(9)
• vmalloc_node(9)
• vzalloc_node(9)
• vrealloc_node_align(9)
• vmalloc_32(9)
• vmalloc_32_user(9)
• vread_iter(9)
• remap_vmalloc_range_partial(9)
• remap_vmalloc_range(9)
• pvm_find_va_enclose_addr(9)
• pvm_determine_end_from_reverse(9)
• pcpu_get_vm_areas(9)
• pcpu_free_vm_areas(9)

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and that's the whole page, bestie 🫶 this one came out of ./mm (yup, the source directory itself) back in October 2026, filed under vmalloc_user(9) — go forth and allocate responsibly 💅✨