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-rw-r--r--arch/mips/kernel/irixelf.c226
1 files changed, 123 insertions, 103 deletions
diff --git a/arch/mips/kernel/irixelf.c b/arch/mips/kernel/irixelf.c
index 4af20cd91f9..881f125eecb 100644
--- a/arch/mips/kernel/irixelf.c
+++ b/arch/mips/kernel/irixelf.c
@@ -8,7 +8,7 @@
*
* Copyright (C) 1993 - 1994 Eric Youngdale <ericy@cais.com>
* Copyright (C) 1996 - 2004 David S. Miller <dm@engr.sgi.com>
- * Copyright (C) 2004 Steven J. Hill <sjhill@realitydiluted.com>
+ * Copyright (C) 2004 - 2005 Steven J. Hill <sjhill@realitydiluted.com>
*/
#include <linux/module.h>
#include <linux/fs.h>
@@ -31,15 +31,16 @@
#include <linux/elfcore.h>
#include <linux/smp_lock.h>
-#include <asm/uaccess.h>
#include <asm/mipsregs.h>
+#include <asm/namei.h>
#include <asm/prctl.h>
+#include <asm/uaccess.h>
#define DLINFO_ITEMS 12
#include <linux/elf.h>
-#undef DEBUG_ELF
+#undef DEBUG
static int load_irix_binary(struct linux_binprm * bprm, struct pt_regs * regs);
static int load_irix_library(struct file *);
@@ -55,7 +56,7 @@ static struct linux_binfmt irix_format = {
#define elf_addr_t unsigned long
#endif
-#ifdef DEBUG_ELF
+#ifdef DEBUG
/* Debugging routines. */
static char *get_elf_p_type(Elf32_Word p_type)
{
@@ -120,7 +121,7 @@ static void dump_phdrs(struct elf_phdr *ep, int pnum)
print_phdr(i, ep);
}
}
-#endif /* (DEBUG_ELF) */
+#endif /* DEBUG */
static void set_brk(unsigned long start, unsigned long end)
{
@@ -150,16 +151,16 @@ static void padzero(unsigned long elf_bss)
}
}
-unsigned long * create_irix_tables(char * p, int argc, int envc,
- struct elfhdr * exec, unsigned int load_addr,
- unsigned int interp_load_addr,
- struct pt_regs *regs, struct elf_phdr *ephdr)
+static unsigned long * create_irix_tables(char * p, int argc, int envc,
+ struct elfhdr * exec, unsigned int load_addr,
+ unsigned int interp_load_addr, struct pt_regs *regs,
+ struct elf_phdr *ephdr)
{
elf_addr_t *argv;
elf_addr_t *envp;
elf_addr_t *sp, *csp;
-#ifdef DEBUG_ELF
+#ifdef DEBUG
printk("create_irix_tables: p[%p] argc[%d] envc[%d] "
"load_addr[%08x] interp_load_addr[%08x]\n",
p, argc, envc, load_addr, interp_load_addr);
@@ -248,14 +249,13 @@ static unsigned int load_irix_interp(struct elfhdr * interp_elf_ex,
last_bss = 0;
error = load_addr = 0;
-#ifdef DEBUG_ELF
+#ifdef DEBUG
print_elfhdr(interp_elf_ex);
#endif
/* First of all, some simple consistency checks */
if ((interp_elf_ex->e_type != ET_EXEC &&
interp_elf_ex->e_type != ET_DYN) ||
- !irix_elf_check_arch(interp_elf_ex) ||
!interpreter->f_op->mmap) {
printk("IRIX interp has bad e_type %d\n", interp_elf_ex->e_type);
return 0xffffffff;
@@ -290,7 +290,7 @@ static unsigned int load_irix_interp(struct elfhdr * interp_elf_ex,
(char *) elf_phdata,
sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
-#ifdef DEBUG_ELF
+#ifdef DEBUG
dump_phdrs(elf_phdata, interp_elf_ex->e_phnum);
#endif
@@ -306,13 +306,11 @@ static unsigned int load_irix_interp(struct elfhdr * interp_elf_ex,
elf_type |= MAP_FIXED;
vaddr = eppnt->p_vaddr;
-#ifdef DEBUG_ELF
- printk("INTERP do_mmap(%p, %08lx, %08lx, %08lx, %08lx, %08lx) ",
+ pr_debug("INTERP do_mmap(%p, %08lx, %08lx, %08lx, %08lx, %08lx) ",
interpreter, vaddr,
(unsigned long) (eppnt->p_filesz + (eppnt->p_vaddr & 0xfff)),
(unsigned long) elf_prot, (unsigned long) elf_type,
(unsigned long) (eppnt->p_offset & 0xfffff000));
-#endif
down_write(&current->mm->mmap_sem);
error = do_mmap(interpreter, vaddr,
eppnt->p_filesz + (eppnt->p_vaddr & 0xfff),
@@ -324,14 +322,10 @@ static unsigned int load_irix_interp(struct elfhdr * interp_elf_ex,
printk("Aieee IRIX interp mmap error=%d\n", error);
break; /* Real error */
}
-#ifdef DEBUG_ELF
- printk("error=%08lx ", (unsigned long) error);
-#endif
+ pr_debug("error=%08lx ", (unsigned long) error);
if(!load_addr && interp_elf_ex->e_type == ET_DYN) {
load_addr = error;
-#ifdef DEBUG_ELF
- printk("load_addr = error ");
-#endif
+ pr_debug("load_addr = error ");
}
/* Find the end of the file mapping for this phdr, and keep
@@ -345,17 +339,13 @@ static unsigned int load_irix_interp(struct elfhdr * interp_elf_ex,
*/
k = eppnt->p_memsz + eppnt->p_vaddr;
if(k > last_bss) last_bss = k;
-#ifdef DEBUG_ELF
- printk("\n");
-#endif
+ pr_debug("\n");
}
}
/* Now use mmap to map the library into memory. */
if(error < 0 && error > -1024) {
-#ifdef DEBUG_ELF
- printk("got error %d\n", error);
-#endif
+ pr_debug("got error %d\n", error);
kfree(elf_phdata);
return 0xffffffff;
}
@@ -365,16 +355,12 @@ static unsigned int load_irix_interp(struct elfhdr * interp_elf_ex,
* that there are zero-mapped pages up to and including the
* last bss page.
*/
-#ifdef DEBUG_ELF
- printk("padzero(%08lx) ", (unsigned long) (elf_bss));
-#endif
+ pr_debug("padzero(%08lx) ", (unsigned long) (elf_bss));
padzero(elf_bss);
len = (elf_bss + 0xfff) & 0xfffff000; /* What we have mapped so far */
-#ifdef DEBUG_ELF
- printk("last_bss[%08lx] len[%08lx]\n", (unsigned long) last_bss,
- (unsigned long) len);
-#endif
+ pr_debug("last_bss[%08lx] len[%08lx]\n", (unsigned long) last_bss,
+ (unsigned long) len);
/* Map the last of the bss segment */
if (last_bss > len) {
@@ -396,12 +382,7 @@ static int verify_binary(struct elfhdr *ehp, struct linux_binprm *bprm)
/* First of all, some simple consistency checks */
if((ehp->e_type != ET_EXEC && ehp->e_type != ET_DYN) ||
- !irix_elf_check_arch(ehp) || !bprm->file->f_op->mmap) {
- return -ENOEXEC;
- }
-
- /* Only support MIPS ARCH2 or greater IRIX binaries for now. */
- if(!(ehp->e_flags & EF_MIPS_ARCH) && !(ehp->e_flags & 0x04)) {
+ !bprm->file->f_op->mmap) {
return -ENOEXEC;
}
@@ -411,16 +392,17 @@ static int verify_binary(struct elfhdr *ehp, struct linux_binprm *bprm)
* XXX all registers as 64bits on cpu's capable of this at
* XXX exception time plus frob the XTLB exception vector.
*/
- if((ehp->e_flags & 0x20)) {
+ if((ehp->e_flags & EF_MIPS_ABI2))
return -ENOEXEC;
- }
- return 0; /* It's ok. */
+ return 0;
}
-#define IRIX_INTERP_PREFIX "/usr/gnemul/irix"
-
-/* Look for an IRIX ELF interpreter. */
+/*
+ * This is where the detailed check is performed. Irix binaries
+ * use interpreters with 'libc.so' in the name, so this function
+ * can differentiate between Linux and Irix binaries.
+ */
static inline int look_for_irix_interpreter(char **name,
struct file **interpreter,
struct elfhdr *interp_elf_ex,
@@ -440,12 +422,13 @@ static inline int look_for_irix_interpreter(char **name,
if (*name != NULL)
goto out;
- *name = kmalloc((epp->p_filesz + strlen(IRIX_INTERP_PREFIX)),
- GFP_KERNEL);
+ *name = (char *) kmalloc((epp->p_filesz +
+ strlen(IRIX_EMUL)),
+ GFP_KERNEL);
if (!*name)
return -ENOMEM;
- strcpy(*name, IRIX_INTERP_PREFIX);
+ strcpy(*name, IRIX_EMUL);
retval = kernel_read(bprm->file, epp->p_offset, (*name + 16),
epp->p_filesz);
if (retval < 0)
@@ -562,7 +545,7 @@ static inline int map_interpreter(struct elf_phdr *epp, struct elfhdr *ihp,
* process and the system, here we map the page and fill the
* structure
*/
-void irix_map_prda_page (void)
+static void irix_map_prda_page(void)
{
unsigned long v;
struct prda *pp;
@@ -601,14 +584,33 @@ static int load_irix_binary(struct linux_binprm * bprm, struct pt_regs * regs)
load_addr = 0;
has_interp = has_ephdr = 0;
- elf_ihdr = elf_ephdr = 0;
+ elf_ihdr = elf_ephdr = NULL;
elf_ex = *((struct elfhdr *) bprm->buf);
retval = -ENOEXEC;
if (verify_binary(&elf_ex, bprm))
goto out;
-#ifdef DEBUG_ELF
+ /*
+ * Telling -o32 static binaries from Linux and Irix apart from each
+ * other is difficult. There are 2 differences to be noted for static
+ * binaries from the 2 operating systems:
+ *
+ * 1) Irix binaries have their .text section before their .init
+ * section. Linux binaries are just the opposite.
+ *
+ * 2) Irix binaries usually have <= 12 sections and Linux
+ * binaries have > 20.
+ *
+ * We will use Method #2 since Method #1 would require us to read in
+ * the section headers which is way too much overhead. This appears
+ * to work for everything we have ran into so far. If anyone has a
+ * better method to tell the binaries apart, I'm listening.
+ */
+ if (elf_ex.e_shnum > 20)
+ goto out;
+
+#ifdef DEBUG
print_elfhdr(&elf_ex);
#endif
@@ -623,11 +625,10 @@ static int load_irix_binary(struct linux_binprm * bprm, struct pt_regs * regs)
}
retval = kernel_read(bprm->file, elf_ex.e_phoff, (char *)elf_phdata, size);
-
if (retval < 0)
goto out_free_ph;
-#ifdef DEBUG_ELF
+#ifdef DEBUG
dump_phdrs(elf_phdata, elf_ex.e_phnum);
#endif
@@ -644,9 +645,8 @@ static int load_irix_binary(struct linux_binprm * bprm, struct pt_regs * regs)
break;
};
}
-#ifdef DEBUG_ELF
- printk("\n");
-#endif
+
+ pr_debug("\n");
elf_bss = 0;
elf_brk = 0;
@@ -657,12 +657,19 @@ static int load_irix_binary(struct linux_binprm * bprm, struct pt_regs * regs)
end_code = 0;
end_data = 0;
- retval = look_for_irix_interpreter(&elf_interpreter,
- &interpreter,
+ /*
+ * If we get a return value, we change the value to be ENOEXEC
+ * so that we can exit gracefully and the main binary format
+ * search loop in 'fs/exec.c' will move onto the next handler
+ * which should be the normal ELF binary handler.
+ */
+ retval = look_for_irix_interpreter(&elf_interpreter, &interpreter,
&interp_elf_ex, elf_phdata, bprm,
elf_ex.e_phnum);
- if (retval)
+ if (retval) {
+ retval = -ENOEXEC;
goto out_free_file;
+ }
if (elf_interpreter) {
retval = verify_irix_interpreter(&interp_elf_ex);
@@ -746,18 +753,16 @@ static int load_irix_binary(struct linux_binprm * bprm, struct pt_regs * regs)
* IRIX maps a page at 0x200000 which holds some system
* information. Programs depend on this.
*/
- irix_map_prda_page ();
+ irix_map_prda_page();
padzero(elf_bss);
-#ifdef DEBUG_ELF
- printk("(start_brk) %lx\n" , (long) current->mm->start_brk);
- printk("(end_code) %lx\n" , (long) current->mm->end_code);
- printk("(start_code) %lx\n" , (long) current->mm->start_code);
- printk("(end_data) %lx\n" , (long) current->mm->end_data);
- printk("(start_stack) %lx\n" , (long) current->mm->start_stack);
- printk("(brk) %lx\n" , (long) current->mm->brk);
-#endif
+ pr_debug("(start_brk) %lx\n" , (long) current->mm->start_brk);
+ pr_debug("(end_code) %lx\n" , (long) current->mm->end_code);
+ pr_debug("(start_code) %lx\n" , (long) current->mm->start_code);
+ pr_debug("(end_data) %lx\n" , (long) current->mm->end_data);
+ pr_debug("(start_stack) %lx\n" , (long) current->mm->start_stack);
+ pr_debug("(brk) %lx\n" , (long) current->mm->brk);
#if 0 /* XXX No fucking way dude... */
/* Why this, you ask??? Well SVr4 maps page 0 as read-only,
@@ -782,8 +787,7 @@ out_free_dentry:
allow_write_access(interpreter);
fput(interpreter);
out_free_interp:
- if (elf_interpreter)
- kfree(elf_interpreter);
+ kfree(elf_interpreter);
out_free_file:
out_free_ph:
kfree (elf_phdata);
@@ -813,7 +817,7 @@ static int load_irix_library(struct file *file)
/* First of all, some simple consistency checks. */
if(elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
- !irix_elf_check_arch(&elf_ex) || !file->f_op->mmap)
+ !file->f_op->mmap)
return -ENOEXEC;
/* Now read in all of the header information. */
@@ -876,33 +880,34 @@ static int load_irix_library(struct file *file)
*/
unsigned long irix_mapelf(int fd, struct elf_phdr *user_phdrp, int cnt)
{
+ unsigned long type, vaddr, filesz, offset, flags;
struct elf_phdr *hp;
struct file *filp;
int i, retval;
-#ifdef DEBUG_ELF
- printk("irix_mapelf: fd[%d] user_phdrp[%p] cnt[%d]\n",
- fd, user_phdrp, cnt);
-#endif
+ pr_debug("irix_mapelf: fd[%d] user_phdrp[%p] cnt[%d]\n",
+ fd, user_phdrp, cnt);
/* First get the verification out of the way. */
hp = user_phdrp;
if (!access_ok(VERIFY_READ, hp, (sizeof(struct elf_phdr) * cnt))) {
-#ifdef DEBUG_ELF
- printk("irix_mapelf: access_ok fails!\n");
-#endif
+ pr_debug("irix_mapelf: bad pointer to ELF PHDR!\n");
+
return -EFAULT;
}
-#ifdef DEBUG_ELF
+#ifdef DEBUG
dump_phdrs(user_phdrp, cnt);
#endif
- for(i = 0; i < cnt; i++, hp++)
- if(hp->p_type != PT_LOAD) {
+ for (i = 0; i < cnt; i++, hp++) {
+ if (__get_user(type, &hp->p_type))
+ return -EFAULT;
+ if (type != PT_LOAD) {
printk("irix_mapelf: One section is not PT_LOAD!\n");
return -ENOEXEC;
}
+ }
filp = fget(fd);
if (!filp)
@@ -917,29 +922,40 @@ unsigned long irix_mapelf(int fd, struct elf_phdr *user_phdrp, int cnt)
for(i = 0; i < cnt; i++, hp++) {
int prot;
- prot = (hp->p_flags & PF_R) ? PROT_READ : 0;
- prot |= (hp->p_flags & PF_W) ? PROT_WRITE : 0;
- prot |= (hp->p_flags & PF_X) ? PROT_EXEC : 0;
+ retval = __get_user(vaddr, &hp->p_vaddr);
+ retval |= __get_user(filesz, &hp->p_filesz);
+ retval |= __get_user(offset, &hp->p_offset);
+ retval |= __get_user(flags, &hp->p_flags);
+ if (retval)
+ return retval;
+
+ prot = (flags & PF_R) ? PROT_READ : 0;
+ prot |= (flags & PF_W) ? PROT_WRITE : 0;
+ prot |= (flags & PF_X) ? PROT_EXEC : 0;
+
down_write(&current->mm->mmap_sem);
- retval = do_mmap(filp, (hp->p_vaddr & 0xfffff000),
- (hp->p_filesz + (hp->p_vaddr & 0xfff)),
+ retval = do_mmap(filp, (vaddr & 0xfffff000),
+ (filesz + (vaddr & 0xfff)),
prot, (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
- (hp->p_offset & 0xfffff000));
+ (offset & 0xfffff000));
up_write(&current->mm->mmap_sem);
- if(retval != (hp->p_vaddr & 0xfffff000)) {
+ if (retval != (vaddr & 0xfffff000)) {
printk("irix_mapelf: do_mmap fails with %d!\n", retval);
fput(filp);
return retval;
}
}
-#ifdef DEBUG_ELF
- printk("irix_mapelf: Success, returning %08lx\n",
- (unsigned long) user_phdrp->p_vaddr);
-#endif
+ pr_debug("irix_mapelf: Success, returning %08lx\n",
+ (unsigned long) user_phdrp->p_vaddr);
+
fput(filp);
- return user_phdrp->p_vaddr;
+
+ if (__get_user(vaddr, &user_phdrp->p_vaddr))
+ return -EFAULT;
+
+ return vaddr;
}
/*
@@ -954,7 +970,7 @@ unsigned long irix_mapelf(int fd, struct elf_phdr *user_phdrp, int cnt)
*/
static int dump_write(struct file *file, const void *addr, int nr)
{
- return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+ return file->f_op->write(file, (const char *) addr, nr, &file->f_pos) == nr;
}
static int dump_seek(struct file *file, off_t off)
@@ -1073,7 +1089,7 @@ static int irix_core_dump(long signr, struct pt_regs * regs, struct file *file)
/* Count what's needed to dump, up to the limit of coredump size. */
segs = 0;
size = 0;
- for(vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
+ for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
if (maydump(vma))
{
int sz = vma->vm_end-vma->vm_start;
@@ -1187,9 +1203,9 @@ static int irix_core_dump(long signr, struct pt_regs * regs, struct file *file)
len = current->mm->arg_end - current->mm->arg_start;
len = len >= ELF_PRARGSZ ? ELF_PRARGSZ : len;
- copy_from_user(&psinfo.pr_psargs,
+ (void *) copy_from_user(&psinfo.pr_psargs,
(const char *)current->mm->arg_start, len);
- for(i = 0; i < len; i++)
+ for (i = 0; i < len; i++)
if (psinfo.pr_psargs[i] == 0)
psinfo.pr_psargs[i] = ' ';
psinfo.pr_psargs[len] = 0;
@@ -1256,8 +1272,10 @@ static int irix_core_dump(long signr, struct pt_regs * regs, struct file *file)
phdr.p_memsz = sz;
offset += phdr.p_filesz;
phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
- if (vma->vm_flags & VM_WRITE) phdr.p_flags |= PF_W;
- if (vma->vm_flags & VM_EXEC) phdr.p_flags |= PF_X;
+ if (vma->vm_flags & VM_WRITE)
+ phdr.p_flags |= PF_W;
+ if (vma->vm_flags & VM_EXEC)
+ phdr.p_flags |= PF_X;
phdr.p_align = PAGE_SIZE;
DUMP_WRITE(&phdr, sizeof(phdr));
@@ -1299,7 +1317,7 @@ end_coredump:
static int __init init_irix_binfmt(void)
{
- int init_inventory(void);
+ extern int init_inventory(void);
extern asmlinkage unsigned long sys_call_table;
extern asmlinkage unsigned long sys_call_table_irix5;
@@ -1318,7 +1336,9 @@ static int __init init_irix_binfmt(void)
static void __exit exit_irix_binfmt(void)
{
- /* Remove the IRIX ELF loaders. */
+ /*
+ * Remove the Irix ELF loader.
+ */
unregister_binfmt(&irix_format);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 03:47:04 +0000