How to trick the SYS_read execution with ptrace
0
I'm wondering whether we could use ptrace to trick a syscall execution. For example, can we trick the SYS_read with a pre-defined input, so that application users will not have to type anything from the keyboard? Thanks!
linux system system-calls ptrace
asked Nov 13 '18 at 16:31
xiaogwxiaogw
599
add a comment |
0
I'm wondering whether we could use ptrace to trick a syscall execution. For example, can we trick the SYS_read with a pre-defined input, so that application users will not have to type anything from the keyboard? Thanks!
linux system system-calls ptrace
asked Nov 13 '18 at 16:31
xiaogwxiaogw
599
This looks like a good article on it: nullprogram.com/blog/2018/06/23
– Andrew Sun
Nov 13 '18 at 16:39
@AndrewSun There is a problem with the method above. TheSYS_readis always blocked to wait for any user input. My question is how can we "feed" the user input with ptrace (or other methods), and letSYS_readcontinue execution.
– xiaogw
Nov 13 '18 at 16:49
Could you not just copy the data into the buffer yourself and cancel the original syscall using the technique described in the article?
– Andrew Sun
Nov 13 '18 at 17:00
By the way, is there a reason you couldn't just use pipes to redirect stdin?
– Andrew Sun
Nov 13 '18 at 19:13
Thanks for the answer. I feed the read input buffer withptrace(PTRACE_POKEDATA, ...)and replace theSYS_readwithSYS_getpidto get things to work. It's just a research project that has to manipulate syscalls.
– xiaogw
Nov 13 '18 at 20:22
add a comment |
0
0
0
I'm wondering whether we could use ptrace to trick a syscall execution. For example, can we trick the SYS_read with a pre-defined input, so that application users will not have to type anything from the keyboard? Thanks!
linux system system-calls ptrace
asked Nov 13 '18 at 16:31
xiaogwxiaogw
599
I'm wondering whether we could use ptrace to trick a syscall execution. For example, can we trick the SYS_read with a pre-defined input, so that application users will not have to type anything from the keyboard? Thanks!
linux system system-calls ptrace
linux system system-calls ptrace
asked Nov 13 '18 at 16:31
xiaogwxiaogw
599
asked Nov 13 '18 at 16:31
xiaogwxiaogw
599
asked Nov 13 '18 at 16:31
xiaogwxiaogw
599
asked Nov 13 '18 at 16:31
xiaogwxiaogw
599
asked Nov 13 '18 at 16:31
xiaogwxiaogw
599
599
This looks like a good article on it: nullprogram.com/blog/2018/06/23
– Andrew Sun
Nov 13 '18 at 16:39
@AndrewSun There is a problem with the method above. TheSYS_readis always blocked to wait for any user input. My question is how can we "feed" the user input with ptrace (or other methods), and letSYS_readcontinue execution.
– xiaogw
Nov 13 '18 at 16:49
Could you not just copy the data into the buffer yourself and cancel the original syscall using the technique described in the article?
– Andrew Sun
Nov 13 '18 at 17:00
By the way, is there a reason you couldn't just use pipes to redirect stdin?
– Andrew Sun
Nov 13 '18 at 19:13
Thanks for the answer. I feed the read input buffer withptrace(PTRACE_POKEDATA, ...)and replace theSYS_readwithSYS_getpidto get things to work. It's just a research project that has to manipulate syscalls.
– xiaogw
Nov 13 '18 at 20:22
add a comment |
This looks like a good article on it: nullprogram.com/blog/2018/06/23
– Andrew Sun
Nov 13 '18 at 16:39
@AndrewSun There is a problem with the method above. TheSYS_readis always blocked to wait for any user input. My question is how can we "feed" the user input with ptrace (or other methods), and letSYS_readcontinue execution.
– xiaogw
Nov 13 '18 at 16:49
Could you not just copy the data into the buffer yourself and cancel the original syscall using the technique described in the article?
– Andrew Sun
Nov 13 '18 at 17:00
By the way, is there a reason you couldn't just use pipes to redirect stdin?
– Andrew Sun
Nov 13 '18 at 19:13
Thanks for the answer. I feed the read input buffer withptrace(PTRACE_POKEDATA, ...)and replace theSYS_readwithSYS_getpidto get things to work. It's just a research project that has to manipulate syscalls.
– xiaogw
Nov 13 '18 at 20:22
This looks like a good article on it: nullprogram.com/blog/2018/06/23
– Andrew Sun
Nov 13 '18 at 16:39
This looks like a good article on it: nullprogram.com/blog/2018/06/23
– Andrew Sun
Nov 13 '18 at 16:39
@AndrewSun There is a problem with the method above. The
SYS_read is always blocked to wait for any user input. My question is how can we "feed" the user input with ptrace (or other methods), and let SYS_read continue execution.– xiaogw
Nov 13 '18 at 16:49
@AndrewSun There is a problem with the method above. The
SYS_read is always blocked to wait for any user input. My question is how can we "feed" the user input with ptrace (or other methods), and let SYS_read continue execution.– xiaogw
Nov 13 '18 at 16:49
Could you not just copy the data into the buffer yourself and cancel the original syscall using the technique described in the article?
– Andrew Sun
Nov 13 '18 at 17:00
Could you not just copy the data into the buffer yourself and cancel the original syscall using the technique described in the article?
– Andrew Sun
Nov 13 '18 at 17:00
By the way, is there a reason you couldn't just use pipes to redirect stdin?
– Andrew Sun
Nov 13 '18 at 19:13
By the way, is there a reason you couldn't just use pipes to redirect stdin?
– Andrew Sun
Nov 13 '18 at 19:13
Thanks for the answer. I feed the read input buffer with
ptrace(PTRACE_POKEDATA, ...) and replace the SYS_read with SYS_getpid to get things to work. It's just a research project that has to manipulate syscalls.– xiaogw
Nov 13 '18 at 20:22
Thanks for the answer. I feed the read input buffer with
ptrace(PTRACE_POKEDATA, ...) and replace the SYS_read with SYS_getpid to get things to work. It's just a research project that has to manipulate syscalls.– xiaogw
Nov 13 '18 at 20:22
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This looks like a good article on it: nullprogram.com/blog/2018/06/23
– Andrew Sun
Nov 13 '18 at 16:39
@AndrewSun There is a problem with the method above. The
SYS_readis always blocked to wait for any user input. My question is how can we "feed" the user input with ptrace (or other methods), and letSYS_readcontinue execution.– xiaogw
Nov 13 '18 at 16:49
Could you not just copy the data into the buffer yourself and cancel the original syscall using the technique described in the article?
– Andrew Sun
Nov 13 '18 at 17:00
By the way, is there a reason you couldn't just use pipes to redirect stdin?
– Andrew Sun
Nov 13 '18 at 19:13
Thanks for the answer. I feed the read input buffer with
ptrace(PTRACE_POKEDATA, ...)and replace theSYS_readwithSYS_getpidto get things to work. It's just a research project that has to manipulate syscalls.– xiaogw
Nov 13 '18 at 20:22