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Map pages in read-only ELF sections as non-writable.

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This is so cool! :^) Now you'll crash if you try to write into your
.text or .rodata segments.
This commit is contained in:
Andreas Kling 2018-11-03 11:36:45 +01:00
parent aa6d06b47e
commit da13c9a264
4 changed files with 26 additions and 6 deletions
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16
Userland/sh.cpp
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@ -65,6 +65,18 @@ static int sh_fef(int, const char**)
return 0;
}
static int sh_wt(int, const char**)
{
const char* rodata_ptr = "foo";
printf("Writing to rodata=%p...\n", rodata_ptr);
*(char*)rodata_ptr = 0;
char* text_ptr = (char*)sh_fef;
printf("Writing to text=%p...\n", text_ptr);
*text_ptr = 0;
return 0;
}
static int sh_exit(int, const char**)
{
printf("Good-bye!\n");
@ -135,6 +147,10 @@ static bool handle_builtin(int argc, const char** argv, int& retval)
retval = sh_fef(argc, argv);
return true;
}
if (!strcmp(argv[0], "wt")) {
retval = sh_wt(argc, argv);
return true;
}
if (!strcmp(argv[0], "fork")) {
retval = sh_fork(argc, argv);
return true;