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Linux Internals: How /proc/self/mem writes to unwritable memory (2021)

Link: offlinemark.com/an-obscure-qui
Discussion: news.ycombinator.com/item?id=4

Linux Internals: How /proc/self/mem writes to unwritable memory - offlinemark

Introduction An obscure quirk of the /proc/*/mem pseudofile is its “punch through” semantics. Writes performed through this file will succeed even if the destination virtual memory is marked unwritable. In fact, this behavior is intentional and actively used by projects such as the Julia JIT comp

offlinemark.com · offlinemark

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