remove memsets

Signed-off-by: Mykyta Yatsenko <[email protected]>

Author: mykyta5

tools/testing/selftests/bpf/progs/file_reader.c

@@ -75,102 +75,17 @@ static int task_work_callback(struct bpf_map *map, void *key, void *value)
 	return 0;
 }
 
-/* Finds thread local variable `tls_counter` in this executable's ELF */
 static int process_elf(struct task_struct *task, struct vm_area_struct *vma, void *data)
 {
-	/*
-	Elf64_Ehdr ehdr;
-	Elf64_Shdr shdrs;
-	Elf64_Shdr symtab, strtab, tmp;
-	const Elf64_Sym *symbol;
-	int count, off, i, e_shnum, e_shoff, e_shentsize, sections = 0;
-	const char *string;
 	struct bpf_dynptr dynptr;
-	const __u32 slen = 11;
-	static const char *needle = "tls_counter";
 
 	if (!vma->vm_file) {
 		err = 1;
 		return 1;
 	}
 
-	err = bpf_dynptr_from_file(vma->vm_file, 0, &dynptr);
-	if (err)
-		goto fail;
-
-	err = bpf_dynptr_read(&ehdr, sizeof(ehdr), &dynptr, 0, 0);
-	if (err)
-		goto fail;
-
-	 Big endian, do not support
-	if (ehdr.e_ident[EI_DATA] == ELFDATA2MSB)
-		goto success;
-
-	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0)
-		goto fail;
-
-	if (ehdr.e_type != ET_EXEC && ehdr.e_type != ET_DYN)
-		goto fail;
-
-	if (ehdr.e_ident[EI_CLASS] != ELFCLASS64)
-		goto fail;
-
-	e_shnum = ehdr.e_shnum;
-	e_shoff = ehdr.e_shoff;
-	e_shentsize = ehdr.e_shentsize;
-
-	err = bpf_dynptr_read(&shdrs, sizeof(shdrs), &dynptr,
-			      e_shoff + e_shentsize * ehdr.e_shstrndx, 0);
-	if (err)
-		goto fail;
-
-	off = shdrs.sh_offset;
-
-	__builtin_memset(&symtab, 0, sizeof(symtab));
-	__builtin_memset(&strtab, 0, sizeof(strtab));
-	bpf_for(i, 0, e_shnum)
-	{
-		err = bpf_dynptr_read(&tmp, sizeof(Elf64_Shdr), &dynptr, e_shoff + e_shentsize * i,
-				      0);
-		if (err)
-			goto fail;
-
-		string = bpf_dynptr_slice(&dynptr, off + tmp.sh_name, buf, slen);
-		if (!string)
-			goto fail;
-
-		if (bpf_strncmp(string, slen, ".symtab") == 0) {
-			symtab = tmp;
-			++sections;
-		} else if (bpf_strncmp(string, slen, ".strtab") == 0) {
-			strtab = tmp;
-			++sections;
-		}
-		if (sections == 2)
-			break;
-	}
-	if (sections != 2)
-		goto fail;
-
-	count = symtab.sh_size / sizeof(Elf64_Sym);
-	bpf_for(i, 0, count)
-	{
-		symbol = bpf_dynptr_slice(&dynptr, symtab.sh_offset + sizeof(Elf64_Sym) * i, buf,
-					  sizeof(Elf64_Sym));
-		if (!symbol)
-			goto fail;
-		if (symbol->st_name == 0 || ELF64_ST_TYPE(symbol->st_info) != STT_TLS)
-			continue;
-		string = bpf_dynptr_slice(&dynptr, strtab.sh_offset + symbol->st_name, buf, slen);
-		if (!string)
-			goto fail;
-		if (bpf_strncmp(string, slen, needle) == 0)
-			goto success;
-	}
-fail:
-	err = 1;
-success:
+	//err = bpf_dynptr_from_file(vma->vm_file, 0, &dynptr);
+
 	bpf_dynptr_file_discard(&dynptr);
-	*/
 	return err ? 1 : 0;
 }