mirror of
https://github.com/termux-pacman/glibc-packages.git
synced 2024-11-13 13:59:21 +00:00
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/* - Fix for Termux
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If you run mprotect with the PROT_EXEC flag,
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then the error "Permission denied" is displayed.
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Cause: https://github.com/termux/proot/commit/89bfa991cb3cb7fc78099d06d0f7e7c840cb62d1
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Issue: https://github.com/termux-pacman/glibc-packages/issues/49
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Solution: https://stackoverflow.com/questions/59303617/c-mprotect-for-read-write-and-execute
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*/
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#include <errno.h>
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#include <sys/mman.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <string.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <not-cancel.h>
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#ifdef SHARED
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# define GLOBAL_READ_SIZE 1024
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/* - String To Unsigned Long Int
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There are two chairs - one is called "strtoul", the other "stuli"...
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*/
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unsigned long int __stuli(char *value) {
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unsigned long int val, res = 0;
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int len = strlen(value);
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for (int i=0; i<len; i++) {
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val = value[len-1-i]-'0';
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if (val == 0)
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continue;
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else if (val > 9)
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val = value[len-1-i]-'W';
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for (int j=0; j<i; j++)
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val *= 16;
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res += val;
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}
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return res;
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}
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static int __is_mmaped(void *addr) {
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char buff[GLOBAL_READ_SIZE];
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char *buff2 = "";
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char *cont = "";
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int res = 0;
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int strlc, strlb;
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memset(buff, 0, sizeof(buff));
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int map = __open_nocancel("/proc/self/maps", O_RDONLY|O_CLOEXEC);
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if (map >= 0) {
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while (__read_nocancel(map, buff, GLOBAL_READ_SIZE) > 0) {
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buff[GLOBAL_READ_SIZE] = '\0';
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strlc = strlen(cont);
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if (strlc > 0) {
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buff2 = malloc(sizeof(char)*strlc);
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memcpy(buff2, cont, strlc);
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}
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cont = malloc(sizeof(char)*(strlc+strlen(buff)));
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memset(cont, 0, sizeof(cont));
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strlb = strlen(buff2);
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if (strlb > 0)
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memcpy(cont, buff2, strlb);
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__strncat(cont, buff, GLOBAL_READ_SIZE);
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memset(buff, 0, sizeof(buff));
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}
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char *saveptr;
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while ((buff2 = strtok_r(cont, "\n", &cont)))
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if (__stuli(strtok_r(buff2, "-", &saveptr)) == (unsigned long int)addr) {
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res = 1;
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break;
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}
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}
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__close_nocancel_nostatus(map);
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return res;
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}
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#endif
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int __mprotect(void *addr, size_t len, int prot) {
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int res = INLINE_SYSCALL_CALL(mprotect, addr, len, prot);
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#ifdef SHARED
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if (res == -1 && errno == EACCES && prot & PROT_EXEC && !__is_mmaped(addr)) {
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size_t saddr = strlen(addr)+1;
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void *caddr;
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int mmap_flags = MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED;
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if (prot & PROT_GROWSDOWN)
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mmap_flags |= MAP_GROWSDOWN;
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if (saddr > 1) {
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caddr = malloc(saddr);
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memcpy(caddr, addr, saddr);
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}
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free(addr);
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addr = mmap(addr, len, PROT_READ|PROT_WRITE|PROT_EXEC, mmap_flags, -1, 0);
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if (saddr > 1)
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memcpy(addr, caddr, saddr);
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return INLINE_SYSCALL_CALL(mprotect, addr, len, prot);
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}
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#endif
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return res;
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}
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libc_hidden_def(__mprotect)
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weak_alias(__mprotect, mprotect)
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