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    Alexander Sosedkin (monk@social.unboiled.info)'s status on Friday, 21-Jun-2024 04:27:35 JSTAlexander SosedkinAlexander Sosedkin
    in reply to
    • ~n
    • mittorn
    @mittorn @nblr can't have both: https://en.m.wikipedia.org/wiki/W%5EX
    In conversationabout 11 months ago from social.unboiled.infopermalink

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      W^X
      W^X ("write xor execute", pronounced W xor X) is a security feature in operating systems and virtual machines. It is a memory protection policy whereby every page in a process's or kernel's address space may be either writable or executable, but not both. Without such protection, a program can write (as data "W") CPU instructions in an area of memory intended for data and then run (as executable "X"; or read-execute "RX") those instructions. This can be dangerous if the writer of the memory is malicious. W^X is the Unix-like terminology for a strict use of the general concept of executable space protection, controlled via the mprotect system call. W^X is relatively simple on processor architectures that support fine-grained page permissions, such as Sun's SPARC and SPARC64, AMD's x86-64, Hewlett-Packard's PA-RISC, HP's (originally Digital Equipment Corporation's) Alpha, and ARM. The term W^X has also been applied to file system write/execute permissions to mitigate file write vulnerabilities (as with in memory) and attacker persistence...
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GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.

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