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Revert "Use anonymous file instead of regular file to back mmap"

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This reverts commit 935d8169b8,
because two anonymous mappings would have different content,
while they must have the same one.
This commit is contained in:
Iavael 2014-01-12 09:26:41 +04:00
parent f42a02efda
commit 8e724128e8
1 changed files with 12 additions and 5 deletions
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17
tccrun.c
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@ -59,18 +59,25 @@ LIBTCCAPI int tcc_relocate(TCCState *s1, void *ptr)
return ret;
#ifdef HAVE_SELINUX
{ /* Use mmap instead of malloc for Selinux. */
{ /* Use mmap instead of malloc for Selinux. Ref:
http://www.gnu.org/s/libc/manual/html_node/File-Size.html */
char tmpfname[] = "/tmp/.tccrunXXXXXX";
int fd = mkstemp (tmpfname);
s1->mem_size = ret;
unlink (tmpfname);
ftruncate (fd, s1->mem_size);
s1->write_mem = mmap (NULL, ret, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
MAP_SHARED, fd, 0);
if (s1->write_mem == MAP_FAILED)
tcc_error("mmap not writeable");
tcc_error("/tmp not writeable");
s1->runtime_mem = mmap (NULL, ret, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
MAP_SHARED, fd, 0);
if (s1->runtime_mem == MAP_FAILED)
tcc_error("mmap not executable");
tcc_error("/tmp not executable");
ret = tcc_relocate_ex(s1, s1->write_mem);
}