From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 10 Oct 2007 12:33:03 +0000 (+0100)
Subject: [MIPS] VPE: reimplement ELF loader.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bdf5d42c6e4d7aa56251b8899f60f55a88c0aaa7;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[MIPS] VPE: reimplement ELF loader.

Loading ELF binaries based on the section table is totally wrong.  This
still leaves the other fat bug of referencing symbols in an executable
unfixed, so people better don't run strip on their binaries ...

As added bonus the new loader is also 23 lines shorter.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 45077c4b2e22..61b729fa0548 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -936,8 +936,18 @@ static int vpe_elfload(struct vpe * v)
 
   		}
   	} else {
-  		for (i = 0; i < hdr->e_shnum; i++) {
+		struct elf_phdr *phdr = (struct elf_phdr *) ((char *)hdr + hdr->e_phoff);
 
+		for (i = 0; i < hdr->e_phnum; i++) {
+			if (phdr->p_type != PT_LOAD)
+				continue;
+
+			memcpy((void *)phdr->p_vaddr, (char *)hdr + phdr->p_offset, phdr->p_filesz);
+			memset((void *)phdr->p_vaddr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
+			phdr++;
+		}
+
+		for (i = 0; i < hdr->e_shnum; i++) {
  			/* Internal symbols and strings. */
  			if (sechdrs[i].sh_type == SHT_SYMTAB) {
  				symindex = i;
@@ -948,39 +958,6 @@ static int vpe_elfload(struct vpe * v)
  				   magic symbols */
  				sechdrs[i].sh_addr = (size_t) hdr + sechdrs[i].sh_offset;
  			}
-
- 			/* filter sections we dont want in the final image */
- 			if (!(sechdrs[i].sh_flags & SHF_ALLOC) ||
- 			    (sechdrs[i].sh_type == SHT_MIPS_REGINFO)) {
- 				printk( KERN_DEBUG " ignoring section, "
- 					"name %s type %x address 0x%x \n",
- 					secstrings + sechdrs[i].sh_name,
- 					sechdrs[i].sh_type, sechdrs[i].sh_addr);
- 				continue;
- 			}
-
-  			if (sechdrs[i].sh_addr < (unsigned int)v->load_addr) {
- 				printk( KERN_WARNING "VPE loader: "
- 					"fully linked image has invalid section, "
- 					"name %s type %x address 0x%x, before load "
- 					"address of 0x%x\n",
- 					secstrings + sechdrs[i].sh_name,
- 					sechdrs[i].sh_type, sechdrs[i].sh_addr,
- 					(unsigned int)v->load_addr);
-  				return -ENOEXEC;
-  			}
-
- 			printk(KERN_DEBUG " copying section sh_name %s, sh_addr 0x%x "
-			       "size 0x%x0 from x%p\n",
-			       secstrings + sechdrs[i].sh_name, sechdrs[i].sh_addr,
-			       sechdrs[i].sh_size, hdr + sechdrs[i].sh_offset);
-
-  			if (sechdrs[i].sh_type != SHT_NOBITS)
-				memcpy((void *)sechdrs[i].sh_addr,
-				       (char *)hdr + sechdrs[i].sh_offset,
- 				       sechdrs[i].sh_size);
-			else
-				memset((void *)sechdrs[i].sh_addr, 0, sechdrs[i].sh_size);
 		}
 	}