diff options
Diffstat (limited to 'fs/binfmt_flat.c')
| -rw-r--r-- | fs/binfmt_flat.c | 48 |
1 files changed, 28 insertions, 20 deletions
diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index 831a2b25ba79..b9c658e0548e 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -138,35 +138,40 @@ static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN; sp = (unsigned long __user *)current->mm->start_stack; - __put_user(bprm->argc, sp++); + if (put_user(bprm->argc, sp++)) + return -EFAULT; if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) { unsigned long argv, envp; argv = (unsigned long)(sp + 2); envp = (unsigned long)(sp + 2 + bprm->argc + 1); - __put_user(argv, sp++); - __put_user(envp, sp++); + if (put_user(argv, sp++) || put_user(envp, sp++)) + return -EFAULT; } current->mm->arg_start = (unsigned long)p; for (i = bprm->argc; i > 0; i--) { - __put_user((unsigned long)p, sp++); + if (put_user((unsigned long)p, sp++)) + return -EFAULT; len = strnlen_user(p, MAX_ARG_STRLEN); if (!len || len > MAX_ARG_STRLEN) return -EINVAL; p += len; } - __put_user(0, sp++); + if (put_user(0, sp++)) + return -EFAULT; current->mm->arg_end = (unsigned long)p; current->mm->env_start = (unsigned long) p; for (i = bprm->envc; i > 0; i--) { - __put_user((unsigned long)p, sp++); + if (put_user((unsigned long)p, sp++)) + return -EFAULT; len = strnlen_user(p, MAX_ARG_STRLEN); if (!len || len > MAX_ARG_STRLEN) return -EINVAL; p += len; } - __put_user(0, sp++); + if (put_user(0, sp++)) + return -EFAULT; current->mm->env_end = (unsigned long)p; return 0; @@ -534,7 +539,7 @@ static int load_flat_file(struct linux_binprm *bprm, /* Flush all traces of the currently running executable */ if (id == 0) { - ret = flush_old_exec(bprm); + ret = begin_new_exec(bprm); if (ret) goto err; @@ -571,7 +576,7 @@ static int load_flat_file(struct linux_binprm *bprm, goto err; } - len = data_len + extra; + len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); len = PAGE_ALIGN(len); realdatastart = vm_mmap(NULL, 0, len, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); @@ -585,7 +590,9 @@ static int load_flat_file(struct linux_binprm *bprm, vm_munmap(textpos, text_len); goto err; } - datapos = ALIGN(realdatastart, FLAT_DATA_ALIGN); + datapos = ALIGN(realdatastart + + MAX_SHARED_LIBS * sizeof(unsigned long), + FLAT_DATA_ALIGN); pr_debug("Allocated data+bss+stack (%u bytes): %lx\n", data_len + bss_len + stack_len, datapos); @@ -615,7 +622,7 @@ static int load_flat_file(struct linux_binprm *bprm, memp_size = len; } else { - len = text_len + data_len + extra; + len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(u32); len = PAGE_ALIGN(len); textpos = vm_mmap(NULL, 0, len, PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); @@ -630,7 +637,9 @@ static int load_flat_file(struct linux_binprm *bprm, } realdatastart = textpos + ntohl(hdr->data_start); - datapos = ALIGN(realdatastart, FLAT_DATA_ALIGN); + datapos = ALIGN(realdatastart + + MAX_SHARED_LIBS * sizeof(u32), + FLAT_DATA_ALIGN); reloc = (__be32 __user *) (datapos + (ntohl(hdr->reloc_start) - text_len)); @@ -647,9 +656,8 @@ static int load_flat_file(struct linux_binprm *bprm, (text_len + full_data - sizeof(struct flat_hdr)), 0); - if (datapos != realdatastart) - memmove((void *)datapos, (void *)realdatastart, - full_data); + memmove((void *) datapos, (void *) realdatastart, + full_data); #else /* * This is used on MMU systems mainly for testing. @@ -705,7 +713,8 @@ static int load_flat_file(struct linux_binprm *bprm, if (IS_ERR_VALUE(result)) { ret = result; pr_err("Unable to read code+data+bss, errno %d\n", ret); - vm_munmap(textpos, text_len + data_len + extra); + vm_munmap(textpos, text_len + data_len + extra + + MAX_SHARED_LIBS * sizeof(u32)); goto err; } } @@ -854,7 +863,7 @@ static int load_flat_file(struct linux_binprm *bprm, #endif /* CONFIG_BINFMT_FLAT_OLD */ } - flush_icache_range(start_code, end_code); + flush_icache_user_range(start_code, end_code); /* zero the BSS, BRK and stack areas */ if (clear_user((void __user *)(datapos + data_len), bss_len + @@ -963,8 +972,6 @@ static int load_flat_binary(struct linux_binprm *bprm) } } - install_exec_creds(bprm); - set_binfmt(&flat_format); #ifdef CONFIG_MMU @@ -998,7 +1005,8 @@ static int load_flat_binary(struct linux_binprm *bprm) unsigned long __user *sp; current->mm->start_stack -= sizeof(unsigned long); sp = (unsigned long __user *)current->mm->start_stack; - __put_user(start_addr, sp); + if (put_user(start_addr, sp)) + return -EFAULT; start_addr = libinfo.lib_list[i].entry; } } |