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How Linux finds out about illegal memory access error?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionWhich parts of an ELF executable get loaded into memory, and where?System sending SIGTERM and SIGKILL during normal workLinux reboot out of memoryHow is user space process/thread controlled by the operating systemKernel and User space System CallsQuestions about kernel virtual address layoutDevice id , connection OS & deviceHow to ensure that a shared library will have its memory pages shared by several processes?Is memory mapped I/O only used internally by OS, not exposed to and used by programmers on top of Linux?If the heap is zero-initialized for security, then why is the stack merely uninitialized?
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I have a question about how Linux traps memory access errors. As far as I know, a user space program doesn't need to ask operating system every time it wants to access memory, now when the process tries to access a memory location not in it's address space the CPU must be having a way to stop this and communicate this event to the OS.
So my question is:
How does the CPU inform the OS about this event ?
Does it start executing a predefined code ? If yes, please let me know about where in memory is that code, what is that code section called, what does it do, etc.
linux system-calls segmentation-fault
asked Apr 11 at 17:37
TezeswarTezeswar
82
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Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
I have a question about how Linux traps memory access errors. As far as I know, a user space program doesn't need to ask operating system every time it wants to access memory, now when the process tries to access a memory location not in it's address space the CPU must be having a way to stop this and communicate this event to the OS.
So my question is:
How does the CPU inform the OS about this event ?
Does it start executing a predefined code ? If yes, please let me know about where in memory is that code, what is that code section called, what does it do, etc.
linux system-calls segmentation-fault
asked Apr 11 at 17:37
TezeswarTezeswar
82
New contributor
Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Some relevant light reading here: kernel.org/doc/gorman/html/understand/understand007.html
– DopeGhoti
Apr 11 at 18:00
add a comment |
I have a question about how Linux traps memory access errors. As far as I know, a user space program doesn't need to ask operating system every time it wants to access memory, now when the process tries to access a memory location not in it's address space the CPU must be having a way to stop this and communicate this event to the OS.
So my question is:
How does the CPU inform the OS about this event ?
Does it start executing a predefined code ? If yes, please let me know about where in memory is that code, what is that code section called, what does it do, etc.
linux system-calls segmentation-fault
asked Apr 11 at 17:37
TezeswarTezeswar
82
New contributor
Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a question about how Linux traps memory access errors. As far as I know, a user space program doesn't need to ask operating system every time it wants to access memory, now when the process tries to access a memory location not in it's address space the CPU must be having a way to stop this and communicate this event to the OS.
So my question is:
How does the CPU inform the OS about this event ?
Does it start executing a predefined code ? If yes, please let me know about where in memory is that code, what is that code section called, what does it do, etc.
linux system-calls segmentation-fault
linux system-calls segmentation-fault
asked Apr 11 at 17:37
TezeswarTezeswar
82
New contributor
Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 11 at 17:37
TezeswarTezeswar
82
New contributor
Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited Apr 12 at 14:29
user288752
asked Apr 11 at 17:37
TezeswarTezeswar
82
New contributor
Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 11 at 17:37
TezeswarTezeswar
82
asked Apr 11 at 17:37
TezeswarTezeswar
82
82
New contributor
Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Tezeswar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Some relevant light reading here: kernel.org/doc/gorman/html/understand/understand007.html
– DopeGhoti
Apr 11 at 18:00
add a comment |
Some relevant light reading here: kernel.org/doc/gorman/html/understand/understand007.html
– DopeGhoti
Apr 11 at 18:00
Some relevant light reading here: kernel.org/doc/gorman/html/understand/understand007.html
– DopeGhoti
Apr 11 at 18:00
Some relevant light reading here: kernel.org/doc/gorman/html/understand/understand007.html
– DopeGhoti
Apr 11 at 18:00
add a comment |
1 Answer
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Your guesses seem about 100% correct.
There is hardware called a memory management unit (MMU) (Part of CPU). It is given page tables, that describe what pages do what (what are executable, readable, writable). If a process tries to do what it is not allowed to do, then the MMU interrupts the CPU. The CPU then executes the code in the starting at a particular address. This address is defined in the interrupt vector table. A table of start addresses, for each interrupt type (some CPUs store instructions in this table, not addresses, but they do the same thing).
edited Apr 12 at 10:23
sourcejedi
26k445114
answered Apr 11 at 19:55
ctrl-alt-delorctrl-alt-delor
12.5k52662
Thanks a lot for pointing me in the right direction. It solved many of my other queries. Thanks again!!
– Tezeswar
Apr 11 at 22:41
add a comment |
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1 Answer
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Your guesses seem about 100% correct.
There is hardware called a memory management unit (MMU) (Part of CPU). It is given page tables, that describe what pages do what (what are executable, readable, writable). If a process tries to do what it is not allowed to do, then the MMU interrupts the CPU. The CPU then executes the code in the starting at a particular address. This address is defined in the interrupt vector table. A table of start addresses, for each interrupt type (some CPUs store instructions in this table, not addresses, but they do the same thing).
edited Apr 12 at 10:23
sourcejedi
26k445114
answered Apr 11 at 19:55
ctrl-alt-delorctrl-alt-delor
12.5k52662
Thanks a lot for pointing me in the right direction. It solved many of my other queries. Thanks again!!
– Tezeswar
Apr 11 at 22:41
add a comment |
Your guesses seem about 100% correct.
There is hardware called a memory management unit (MMU) (Part of CPU). It is given page tables, that describe what pages do what (what are executable, readable, writable). If a process tries to do what it is not allowed to do, then the MMU interrupts the CPU. The CPU then executes the code in the starting at a particular address. This address is defined in the interrupt vector table. A table of start addresses, for each interrupt type (some CPUs store instructions in this table, not addresses, but they do the same thing).
edited Apr 12 at 10:23
sourcejedi
26k445114
answered Apr 11 at 19:55
ctrl-alt-delorctrl-alt-delor
12.5k52662
Thanks a lot for pointing me in the right direction. It solved many of my other queries. Thanks again!!
– Tezeswar
Apr 11 at 22:41
add a comment |
Your guesses seem about 100% correct.
There is hardware called a memory management unit (MMU) (Part of CPU). It is given page tables, that describe what pages do what (what are executable, readable, writable). If a process tries to do what it is not allowed to do, then the MMU interrupts the CPU. The CPU then executes the code in the starting at a particular address. This address is defined in the interrupt vector table. A table of start addresses, for each interrupt type (some CPUs store instructions in this table, not addresses, but they do the same thing).
edited Apr 12 at 10:23
sourcejedi
26k445114
answered Apr 11 at 19:55
ctrl-alt-delorctrl-alt-delor
12.5k52662
Your guesses seem about 100% correct.
There is hardware called a memory management unit (MMU) (Part of CPU). It is given page tables, that describe what pages do what (what are executable, readable, writable). If a process tries to do what it is not allowed to do, then the MMU interrupts the CPU. The CPU then executes the code in the starting at a particular address. This address is defined in the interrupt vector table. A table of start addresses, for each interrupt type (some CPUs store instructions in this table, not addresses, but they do the same thing).
edited Apr 12 at 10:23
sourcejedi
26k445114
answered Apr 11 at 19:55
ctrl-alt-delorctrl-alt-delor
12.5k52662
edited Apr 12 at 10:23
sourcejedi
26k445114
edited Apr 12 at 10:23
sourcejedi
26k445114
edited Apr 12 at 10:23
sourcejedi
26k445114
26k445114
answered Apr 11 at 19:55
ctrl-alt-delorctrl-alt-delor
12.5k52662
answered Apr 11 at 19:55
ctrl-alt-delorctrl-alt-delor
12.5k52662
answered Apr 11 at 19:55
ctrl-alt-delorctrl-alt-delor
12.5k52662
12.5k52662
Thanks a lot for pointing me in the right direction. It solved many of my other queries. Thanks again!!
– Tezeswar
Apr 11 at 22:41
add a comment |
Thanks a lot for pointing me in the right direction. It solved many of my other queries. Thanks again!!
– Tezeswar
Apr 11 at 22:41
Thanks a lot for pointing me in the right direction. It solved many of my other queries. Thanks again!!
– Tezeswar
Apr 11 at 22:41
Thanks a lot for pointing me in the right direction. It solved many of my other queries. Thanks again!!
– Tezeswar
Apr 11 at 22:41
add a comment |
Tezeswar is a new contributor. Be nice, and check out our Code of Conduct.
Tezeswar is a new contributor. Be nice, and check out our Code of Conduct.
Tezeswar is a new contributor. Be nice, and check out our Code of Conduct.
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Some relevant light reading here: kernel.org/doc/gorman/html/understand/understand007.html
– DopeGhoti
Apr 11 at 18:00