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binfmt_flat: flat_{get,put}_addr_from_rp() should be able to fail

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on MMU targets EFAULT is possible here.  Make both return 0 or error,
passing what used to be the return value of flat_get_addr_from_rp()
by reference.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2017-05-02 19:52:17 -04:00
parent 2ea659a9ef
commit 468138d785
12 changed files with 168 additions and 81 deletions
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15
arch/sh/include/asm/flat.h
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@@ -12,11 +12,22 @@
#ifndef __ASM_SH_FLAT_H
#define __ASM_SH_FLAT_H
#include <asm/unaligned.h>
#define flat_argvp_envp_on_stack() 0
#define flat_old_ram_flag(flags) (flags)
#define flat_reloc_valid(reloc, size) ((reloc) <= (size))
#define flat_get_addr_from_rp(rp, relval, flags, p) get_unaligned(rp)
#define flat_put_addr_at_rp(rp, val, relval) put_unaligned(val,rp)
static inline int flat_get_addr_from_rp(u32 __user *rp, u32 relval, u32 flags,
u32 *addr, u32 *persistent)
{
*addr = get_unaligned((__force u32 *)rp);
return 0;
}
static inline int flat_put_addr_at_rp(u32 __user *rp, u32 addr, u32 rel)
{
put_unaligned(addr, (__force u32 *)rp);
return 0;
}
#define flat_get_relocate_addr(rel) (rel)
#define flat_set_persistent(relval, p) ({ (void)p; 0; })