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mark executable sections as executable when running in memory

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This commit is contained in:
bellard 2005-09-03 18:31:43 +00:00
parent 16559cd60c
commit b0b8ac13ce
1 changed files with 31 additions and 1 deletions
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32
tcc.c
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@ -40,14 +40,20 @@
#include <time.h> #include <time.h>
#ifdef WIN32 #ifdef WIN32
#include <sys/timeb.h> #include <sys/timeb.h>
#include <windows.h>
#endif #endif
#ifndef WIN32 #ifndef WIN32
#include <sys/time.h> #include <sys/time.h>
#include <sys/ucontext.h> #include <sys/ucontext.h>
#include <sys/mman.h>
#endif #endif
#endif /* !CONFIG_TCCBOOT */ #endif /* !CONFIG_TCCBOOT */
#ifndef PAGESIZE
#define PAGESIZE 4096
#endif
#include "elf.h" #include "elf.h"
#include "stab.h" #include "stab.h"
@ -199,7 +205,7 @@ typedef struct Section {
int sh_entsize; /* elf entry size */ int sh_entsize; /* elf entry size */
unsigned long sh_size; /* section size (only used during output) */ unsigned long sh_size; /* section size (only used during output) */
unsigned long sh_addr; /* address at which the section is relocated */ unsigned long sh_addr; /* address at which the section is relocated */
unsigned long sh_offset; /* address at which the section is relocated */ unsigned long sh_offset; /* file offset */
int nb_hashed_syms; /* used to resize the hash table */ int nb_hashed_syms; /* used to resize the hash table */
struct Section *link; /* link to another section */ struct Section *link; /* link to another section */
struct Section *reloc; /* corresponding section for relocation, if any */ struct Section *reloc; /* corresponding section for relocation, if any */
@ -9615,6 +9621,30 @@ int tcc_relocate(TCCState *s1)
if (s->reloc) if (s->reloc)
relocate_section(s1, s); relocate_section(s1, s);
} }
/* mark executable sections as executable in memory */
for(i = 1; i < s1->nb_sections; i++) {
s = s1->sections[i];
if ((s->sh_flags & (SHF_ALLOC | SHF_EXECINSTR)) ==
(SHF_ALLOC | SHF_EXECINSTR)) {
#ifdef WIN32
{
DWORD old_protect;
VirtualProtect(s->data, s->data_offset,
PAGE_EXECUTE_READWRITE, &old_protect);
}
#else
{
unsigned long start, end;
start = (unsigned long)(s->data) & ~(PAGESIZE - 1);
end = (unsigned long)(s->data + s->data_offset);
end = (end + PAGESIZE - 1) & ~(PAGESIZE - 1);
mprotect((void *)start, end - start,
PROT_READ | PROT_WRITE | PROT_EXEC);
}
#endif
}
}
return 0; return 0;
} }