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Use mmap instead of exec mem for Selinux machines. Fixes crash on Fedora.

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This commit is contained in:
Henry Kroll III 2010-04-20 23:40:33 -07:00 committed by Henry Kroll
parent a64a6f36a0
commit be7e339d8a
2 changed files with 41 additions and 5 deletions
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9
configure vendored
View File

@ -130,6 +130,8 @@ for opt do
;;
--with-libgcc) use_libgcc="yes"
;;
--with-selinux) have_selinux="yes"
;;
--help|-h) show_help="yes"
;;
esac
@ -229,7 +231,8 @@ echo " --cross-prefix=PREFIX use PREFIX for compile tools [$cross_prefix]"
echo " --sysroot=PREFIX prepend PREFIX to library/include paths []"
echo " --cc=CC use C compiler CC [$cc]"
echo " --with-libgcc use /lib/libgcc_s.so.1 instead of libtcc1.a"
echo ""
echo " --with-selinux use mmap instead of exec mem"
echo " [requires write access to /tmp]"echo ""
#echo "NOTE: The object files are build at the place where configure is launched"
exit 1
fi
@ -357,6 +360,10 @@ if test "$use_libgcc" = "yes" ; then
echo "#define CONFIG_USE_LIBGCC" >> $TMPH
echo "CONFIG_USE_LIBGCC=yes" >> config.mak
fi
if test "$have_selinux" = "yes" ; then
echo "#define HAVE_SELINUX" >> $TMPH
echo "HAVE_SELINUX=yes" >> config.mak
fi
version=`head $source_path/VERSION`
echo "VERSION=$version" >>config.mak
echo "#define TCC_VERSION \"$version\"" >> $TMPH

37
tccrun.c
View File

@ -50,10 +50,34 @@ int tcc_relocate(TCCState *s1)
int tcc_run(TCCState *s1, int argc, char **argv)
{
int (*prog_main)(int, char **);
int ret;
#ifdef HAVE_SELINUX
int rret;
void *ptr,*writep;
char tmpfname[] = "/tmp/.tccrunXXXXXX";
int fd = mkstemp (tmpfname);
unlink (tmpfname);
ftruncate (fd, 1000);
if ((rret= tcc_relocate_ex(s1,NULL)) < 0)
return -1;
/* Use mmap instead of malloc for Selinux */
writep = mmap (NULL, rret, PROT_READ|PROT_WRITE,
MAP_SHARED, fd, 0);
if(writep == MAP_FAILED){
error("/tmp not writeable");
return -1;
}
ptr = mmap (NULL, rret, PROT_READ|PROT_EXEC,
MAP_SHARED, fd, 0);
if(ptr == MAP_FAILED){
error("/tmp not executable");
return -1;
}
tcc_relocate_ex(s1, writep);
#else
if (tcc_relocate(s1) < 0)
return -1;
#endif
prog_main = tcc_get_symbol_err(s1, "main");
#ifdef CONFIG_TCC_BACKTRACE
@ -65,7 +89,6 @@ int tcc_run(TCCState *s1, int argc, char **argv)
if (s1->do_bounds_check) {
void (*bound_init)(void);
void (*bound_exit)(void);
int ret;
/* set error function */
rt_bound_error_msg = tcc_get_symbol_err(s1, "__bound_error_msg");
rt_prog_main = prog_main;
@ -85,7 +108,13 @@ int tcc_run(TCCState *s1, int argc, char **argv)
if (p) *p = 0;
}
#endif
return (*prog_main)(argc, argv);
ret=(*prog_main)(argc, argv);
#ifdef HAVE_SELINUX
munmap (writep, rret);
munmap (ptr, rret);
#endif
return ret;
}