mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-01-31 03:27:39 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

add check for replacement at end of section

Browse source 
if the string to replace is at the absolute end of the .rodata section,
it may not have a null terminating byte. In that case alone, we replace
one less byte than earlier, so as to avoid overwriting some other data.
This commit is contained in:
Gautham 2025-01-12 13:15:08 -06:00
parent 4f49a4f1d0
commit 3243d89c78
1 changed files with 12 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
tool/build/renamestr.c
View file

@ -23,6 +23,7 @@
#include "libc/elf/struct/ehdr.h"
#include "libc/elf/struct/phdr.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/likely.h"
#include "libc/macros.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
@ -205,10 +206,18 @@ static void OpenInput(const char *path) {
}
static void ReplaceString(struct Param *param) {
Elf64_Xword len = strnlen(param->roloc, roend - param->roloc);
size_t len;
char *x = (char *)memchr(param->roloc, 0, roend - param->roloc);
memmove(param->roloc, param->to.str, param->to.len);
if (UNLIKELY(x == NULL)) {
len = roend - param->roloc;
memmove(param->roloc + param->to.len, param->roloc + param->from.len,
len - param->from.len);
} else {
len = x - param->roloc;
memmove(param->roloc + param->to.len, param->roloc + param->from.len,
len + 1 - param->from.len);
}
param->roloc += param->to.len;
}