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UserspaceEmulator: Implement the setuid() and setgid() syscalls

Browse source 
Note that running a setuid program (e.g /bin/ping) in UE does not
actually run uid=0. You'll have to run UE itself as uid=0 if you want
to test programs that do setuid/setgid.
This commit is contained in:
Andreas Kling 2020-07-27 16:32:30 +02:00
parent 368cea4094
commit d9f933df7b
2 changed files with 16 additions and 0 deletions
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14
DevTools/UserspaceEmulator/Emulator.cpp
View file

@ -278,6 +278,10 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
return virt$getuid(); return virt$getuid();
case SC_getgid: case SC_getgid:
return virt$getgid(); return virt$getgid();
case SC_setuid:
return virt$setuid(arg1);
case SC_setgid:
return virt$setgid(arg2);
case SC_close: case SC_close:
return virt$close(arg1); return virt$close(arg1);
case SC_fstat: case SC_fstat:
@ -791,6 +795,16 @@ gid_t Emulator::virt$getgid()
return getgid(); return getgid();
} }
int Emulator::virt$setuid(uid_t uid)
{
return syscall(SC_setuid, uid);
}
int Emulator::virt$setgid(gid_t gid)
{
return syscall(SC_setgid, gid);
}
u32 Emulator::virt$write(int fd, FlatPtr data, ssize_t size) u32 Emulator::virt$write(int fd, FlatPtr data, ssize_t size)
{ {
if (size < 0) if (size < 0)

2
DevTools/UserspaceEmulator/Emulator.h
View file

@ -88,6 +88,8 @@ private:
u32 virt$pledge(u32); u32 virt$pledge(u32);
uid_t virt$getuid(); uid_t virt$getuid();
gid_t virt$getgid(); gid_t virt$getgid();
int virt$setuid(uid_t);
int virt$setgid(gid_t);
u32 virt$read(int, FlatPtr, ssize_t); u32 virt$read(int, FlatPtr, ssize_t);
u32 virt$write(int, FlatPtr, ssize_t); u32 virt$write(int, FlatPtr, ssize_t);
u32 virt$mprotect(FlatPtr, size_t, int); u32 virt$mprotect(FlatPtr, size_t, int);