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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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22
libc/elf/getelfsectionheaderaddress.c
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@ -17,16 +17,24 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/elf/elf.h"
#include "libc/stdckdint.h"
#include "libc/elf/struct/shdr.h"
/**
* Returns section header object at `elf.section[i]`.
*
* @param elf points to the start of the executable image
* @param mapsize is the number of bytes past `elf` we can access
* @param i is the section header index, starting at zero
* @return section header pointer, or null on error
*/
Elf64_Shdr *GetElfSectionHeaderAddress(const Elf64_Ehdr *elf, //
size_t mapsize, //
Elf64_Half i) { //
uint64_t addr, last;
uint64_t off;
if (i >= elf->e_shnum) return 0;
if (ckd_add(&addr, (uintptr_t)elf, elf->e_shoff)) return 0;
if (ckd_add(&addr, addr, (unsigned)i * elf->e_shentsize)) return 0;
if (ckd_add(&last, addr, elf->e_shentsize)) return 0;
if (last > (uintptr_t)elf + mapsize) return 0;
return (Elf64_Shdr *)addr;
if (elf->e_shoff <= 0) return 0;
if (elf->e_shoff >= mapsize) return 0;
if (elf->e_shentsize < sizeof(Elf64_Shdr)) return 0;
if ((off = elf->e_shoff + (unsigned)i * elf->e_shentsize) > mapsize) return 0;
return (Elf64_Shdr *)((char *)elf + off);
}