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Lines 14-19
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| 14 |
# endif |
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# endif |
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#endif |
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#endif |
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/* On PaX enable kernels that have MPROTECT enable we can't use PROT_EXEC. */ |
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#ifndef MS_WIN32 |
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#include <stdlib.h> |
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static int emutramp_enabled = -1; |
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static int |
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emutramp_enabled_check (void) |
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{ |
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char *buf = NULL; |
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size_t len = 0; |
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FILE *f; |
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int ret; |
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f = fopen ("/proc/self/status", "r"); |
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if (f == NULL) |
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return 0; |
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ret = 0; |
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while (getline (&buf, &len, f) != -1) |
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if (!strncmp (buf, "PaX:", 4)) |
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{ |
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char emutramp; |
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if (sscanf (buf, "%*s %*c%c", &emutramp) == 1) |
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ret = (emutramp == 'E'); |
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break; |
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} |
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free (buf); |
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fclose (f); |
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return ret; |
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} |
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#define is_emutramp_enabled() (emutramp_enabled >= 0 ? emutramp_enabled \ |
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: (emutramp_enabled = emutramp_enabled_check ())) |
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#else |
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#define is_emutramp_enabled() 0 |
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#endif /* FFI_MMAP_EXEC_EMUTRAMP_PAX */ |
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/* 'allocate_num_pages' is dynamically adjusted starting from one |
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/* 'allocate_num_pages' is dynamically adjusted starting from one |
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page. It grows by a factor of PAGE_ALLOCATION_GROWTH_RATE. This is |
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page. It grows by a factor of PAGE_ALLOCATION_GROWTH_RATE. This is |
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meant to handle both the common case of not needing a lot of pages, |
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meant to handle both the common case of not needing a lot of pages, |
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Lines 77-83
static void more_core(void)
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| 77 |
if (item == NULL) |
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if (item == NULL) |
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return; |
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return; |
| 79 |
#else |
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#else |
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item = (union mmaped_block *)mmap(NULL, |
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if (is_emutramp_enabled ()) |
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item = (union mmaped_block *)mmap(NULL, |
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allocate_num_pages * _pagesize, |
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PROT_READ | PROT_WRITE, |
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MAP_PRIVATE | MAP_ANONYMOUS, |
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-1, |
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0); |
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else |
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item = (union mmaped_block *)mmap(NULL, |
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allocate_num_pages * _pagesize, |
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allocate_num_pages * _pagesize, |
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PROT_READ | PROT_WRITE | PROT_EXEC, |
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PROT_READ | PROT_WRITE | PROT_EXEC, |
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MAP_PRIVATE | MAP_ANONYMOUS, |
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MAP_PRIVATE | MAP_ANONYMOUS, |
