Guest OS : Linux 2.6.15-1.2054_FC5 i686 (Fedora Core 5 i386) Host OS: Linux 2.6.12-10-amd64-k8 #1 x86_64 (Ubuntu 5.10 amd64) QEMU Version : today CVS compiled with kqemu support KQEMU : 1.3.0pre6 Binary used : qemu-system-x86-64 (so kqemu user-mode is used)
I'm running the simple C code attached. With kqemu user-mode, this fails (sigsegv) with the following warning in dmesg : audit(1146505373.813:12): avc: denied { execheap } for pid=1860 comm="selfmodifying scontext=user_u:system_r:unconfined_t:s0 tcontext=user_u:system_r:unconfined_t:s0 tclass=process Erreur de segmentation Without kqemu enabled, it runs fine.
#define _XOPEN_SOURCE 600 #include <sys/mman.h> #include <unistd.h> #include <stdlib.h> #include <stdio.h> int main(int argc, char** argv) { int pagesize = getpagesize(); unsigned char* addr = NULL; posix_memalign((void**)&addr, pagesize, pagesize); mprotect(addr, pagesize, PROT_WRITE | PROT_READ | PROT_EXEC); addr[0] = 0x8b; addr[1] = 0x44; addr[2] = 0x24; addr[3] = 0x04; /* mov 0x4(%esp),%eax */ addr[4] = 0x83; addr[5] = 0xc0; addr[6] = 0x01; /* add $0x1,%eax */ addr[7] = 0xc3; /* ret */ printf("10+1=%d\n", ((int (*)(int))addr)(10)); free(addr); return 0; }
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