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Clean up more code

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- Found some bugs in LLVM compiler-rt library
- The useless LIBC_STUBS package is now deleted
- Improve the overflow checking story even further
- Get chibicc tests working in MODE=dbg mode again
- The libc/isystem/ headers now have correctly named guards
This commit is contained in:
Justine Tunney 2023-06-18 00:55:09 -07:00
parent afc58a8b41
commit d7c79f43ef
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GPG key ID: BE714B4575D6E328
294 changed files with 912 additions and 1208 deletions
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27
libc/elf/getelfstring.c
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@ -17,17 +17,28 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/elf/elf.h"
#include "libc/stdckdint.h"
#include "libc/elf/scalar.h"
#include "libc/elf/struct/ehdr.h"
#include "libc/str/str.h"
/**
* Returns `strtab + i` from elf string table.
*
* @param elf points to the start of the executable image
* @param mapsize is the number of bytes past `elf` we can access
* @param strtab is double-nul string list from GetElfStringTable()
* @param i is byte index into strtab where needed string starts
* @return pointer to nul terminated string, or null on error
*/
char *GetElfString(const Elf64_Ehdr *elf, // validated
size_t mapsize, // validated
const char *strtab, // validated
Elf64_Word rva) { // foreign
uintptr_t addr;
if (!strtab) return 0;
if (ckd_add(&addr, (uintptr_t)strtab, rva)) return 0;
if (addr >= (uintptr_t)elf + mapsize) return 0;
if (!memchr((char *)addr, 0, (uintptr_t)elf + mapsize - addr)) return 0;
return (char *)addr;
Elf64_Word i) { // foreign
const char *e;
e = (const char *)elf;
if (strtab < e) return 0;
if (strtab >= e + mapsize) return 0;
if (strtab + i >= e + mapsize) return 0;
if (!memchr(strtab + i, 0, (e + mapsize) - (strtab + i))) return 0;
return (char *)strtab + i;
}