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e1279c29c2
This is a test program, this will probably be integrated into su daemon. This hides su by bind-mounting something (/system) over /sbin, so that there is no /sbin/su binary. Usage: hidesu /proc/<one pid of the namespace>/ns/mnt This uses the fact that when a program wants access to /sdcard, zygote does this using mount namespaces, so every program accessing /sdcard will be in a custom mount namespace, that can be modified.
23 lines
503 B
C
23 lines
503 B
C
#define _GNU_SOURCE
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#include <sched.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/mount.h>
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#include <sys/syscall.h>
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int main(int argc, char **argv) {
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if(argc != 2) exit(5);
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int fd = open(argv[1], O_RDONLY);
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if(fd == -1) exit(2);
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//TODO: Fix non arm platforms
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#define SYS_setns 375
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int res = syscall(SYS_setns, fd, 0);
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if(res == -1) exit(3);
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//XXX: What to mount to /sbin...?
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res = mount("/system", "/sbin", "bind", MS_BIND, "");
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if(res == -1) exit(4);
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exit(0);
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}
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