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  • whats the purpose of x86 cr0 WP bit? - Stack Overflow
    CR0 WP allows pages to be protected from supervisor-mode writes If CR0 WP = 0, supervisor-mode write accesses are allowed to linear addresses with read-only access rights; if CR0 WP = 1, they are not (User-mode write accesses are never allowed to linear addresses with read-only access rights, regardless of the value of CR0 WP )
  • how to set control register 0 (cr0) bits in x86-64 using gcc assembly . . .
    I think you don't see the "drastic slowdown" because you have multiple cores, right? I made some experiments and it seems to me that setting CD in %cr0 only affects the processor your are running the module on
  • What does write_cr0 (read_cr0 () | 0x10000) do? - Stack Overflow
    CR0 is one of the control registers available on x86 CPUs, which contains flags controlling CPU features related to memory protection, multitasking, paging, etc You can find a full description in Volume 3, Section 2 5 of Intel's Software Developer's Manual
  • x86 - How to access the control registers cr0,cr2,cr3 from a program . . .
    I have written a program which tries to read from and write to the control registers The program compiles fine, but when the inline assembly is about to be executed, it produces a segmentation fa
  • How does setting the PE flag in CR0 enable protected mode?
    In other words: If the address "mov CR0,EAX" is located at address 0x0100:0x1200 then the next instruction executed will be at address 0x0100:0x1203 So switching to protected mode will only be possible in conjunction with a jump instruction; otherwise switching PE itself would do an unwanted jump (from 0x0100:0x1203 Real Mode to 0x0100:0x1203 Protected Mode)
  • How to set a bit in Control Register (cr0) with inline assembly?
    The reason CR0 is likely not appearing to update is because the optimizer probably assumed that the inline assembly in get_cr0 would result in the same value being returned in the first instance of being called and subsequent calls and thus removed a second call to get_cr0
  • Disabling WP bit in CR0 Register in 64 bit Mode - Stack Overflow
    What I'm trying to do here is write to read-only kernel mode code belonging to the address space of ntoskrnl exe but my machine keeps locking up and everything freezes which requires a reboot
  • implicit declaration of function read_cr0 in raspbian
    cr0 is a x86 register The X86_CR0_WP should've been a give-away that this is x86-specific code Clearing that bit results in disabling write protection: The kernel may write read-only mapped pages There's an (unanswered) StackOverflow question about how to do this on ARM I don't know the answer either
  • What happens if I change the value of the control register cr0?
    You can see all of the things CR0 controls on this page Modifying it will require either modifying the Linux kernel or writing a kernel module If you try to access it from userspace code (using inline assembly, for example), then your userspace program will simply encounter a fault and quit, much like what happens if you try reading from an invalid address





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