diff options
| -rw-r--r-- | Documentation/filesystems/proc.txt | 7 | ||||
| -rw-r--r-- | fs/exec.c | 3 | ||||
| -rw-r--r-- | include/linux/binfmts.h | 1 | ||||
| -rw-r--r-- | kernel/auditsc.c | 84 | ||||
| -rw-r--r-- | kernel/sysctl.c | 11 |
5 files changed, 85 insertions, 21 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index ebffdffb3d9..72e247ef6fa 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -1065,6 +1065,13 @@ check the amount of free space (value is in seconds). Default settings are: 4, resume it if we have a value of 3 or more percent; consider information about the amount of free space valid for 30 seconds +audit_argv_kb +------------- + +The file contains a single value denoting the limit on the argv array size +for execve (in KiB). This limit is only applied when system call auditing for +execve is enabled, otherwise the value is ignored. + ctrl-alt-del ------------ diff --git a/fs/exec.c b/fs/exec.c index f20561ff452..2e3f7950c18 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1154,6 +1154,7 @@ int do_execve(char * filename, { struct linux_binprm *bprm; struct file *file; + unsigned long env_p; int retval; int i; @@ -1208,9 +1209,11 @@ int do_execve(char * filename, if (retval < 0) goto out; + env_p = bprm->p; retval = copy_strings(bprm->argc, argv, bprm); if (retval < 0) goto out; + bprm->argv_len = env_p - bprm->p; retval = search_binary_handler(bprm,regs); if (retval >= 0) { diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h index e1a708337be..a0b209cd576 100644 --- a/include/linux/binfmts.h +++ b/include/linux/binfmts.h @@ -40,6 +40,7 @@ struct linux_binprm{ unsigned interp_flags; unsigned interp_data; unsigned long loader, exec; + unsigned long argv_len; }; #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 diff --git a/kernel/auditsc.c b/kernel/auditsc.c index b7640a5f382..535586fc498 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -153,7 +153,7 @@ struct audit_aux_data_execve { struct audit_aux_data d; int argc; int envc; - char mem[0]; + struct mm_struct *mm; }; struct audit_aux_data_socketcall { @@ -831,6 +831,55 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, return rc; } +static void audit_log_execve_info(struct audit_buffer *ab, + struct audit_aux_data_execve *axi) +{ + int i; + long len, ret; + const char __user *p = (const char __user *)axi->mm->arg_start; + char *buf; + + if (axi->mm != current->mm) + return; /* execve failed, no additional info */ + + for (i = 0; i < axi->argc; i++, p += len) { + len = strnlen_user(p, MAX_ARG_PAGES*PAGE_SIZE); + /* + * We just created this mm, if we can't find the strings + * we just copied into it something is _very_ wrong. Similar + * for strings that are too long, we should not have created + * any. + */ + if (!len || len > MAX_ARG_STRLEN) { + WARN_ON(1); + send_sig(SIGKILL, current, 0); + } + + buf = kmalloc(len, GFP_KERNEL); + if (!buf) { + audit_panic("out of memory for argv string\n"); + break; + } + + ret = copy_from_user(buf, p, len); + /* + * There is no reason for this copy to be short. We just + * copied them here, and the mm hasn't been exposed to user- + * space yet. + */ + if (!ret) { + WARN_ON(1); + send_sig(SIGKILL, current, 0); + } + + audit_log_format(ab, "a%d=", i); + audit_log_untrustedstring(ab, buf); + audit_log_format(ab, "\n"); + + kfree(buf); + } +} + static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) { int i, call_panic = 0; @@ -971,13 +1020,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts case AUDIT_EXECVE: { struct audit_aux_data_execve *axi = (void *)aux; - int i; - const char *p; - for (i = 0, p = axi->mem; i < axi->argc; i++) { - audit_log_format(ab, "a%d=", i); - p = audit_log_untrustedstring(ab, p); - audit_log_format(ab, "\n"); - } + audit_log_execve_info(ab, axi); break; } case AUDIT_SOCKETCALL: { @@ -1821,32 +1864,31 @@ int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode return 0; } +int audit_argv_kb = 32; + int audit_bprm(struct linux_binprm *bprm) { struct audit_aux_data_execve *ax; struct audit_context *context = current->audit_context; - unsigned long p, next; - void *to; if (likely(!audit_enabled || !context || context->dummy)) return 0; - ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p, - GFP_KERNEL); + /* + * Even though the stack code doesn't limit the arg+env size any more, + * the audit code requires that _all_ arguments be logged in a single + * netlink skb. Hence cap it :-( + */ + if (bprm->argv_len > (audit_argv_kb << 10)) + return -E2BIG; + + ax = kmalloc(sizeof(*ax), GFP_KERNEL); if (!ax) return -ENOMEM; ax->argc = bprm->argc; ax->envc = bprm->envc; - for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) { - struct page *page = bprm->page[p / PAGE_SIZE]; - void *kaddr = kmap(page); - next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1); - memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p); - to += next - p; - kunmap(page); - } - + ax->mm = bprm->mm; ax->d.type = AUDIT_EXECVE; ax->d.next = context->aux; context->aux = (void *)ax; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 3ed4912bf18..8db41764e2a 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -78,6 +78,7 @@ extern int percpu_pagelist_fraction; extern int compat_log; extern int maps_protect; extern int sysctl_stat_interval; +extern int audit_argv_kb; /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ static int maxolduid = 65535; @@ -306,6 +307,16 @@ static ctl_table kern_table[] = { .mode = 0644, .proc_handler = &proc_dointvec, }, +#ifdef CONFIG_AUDITSYSCALL + { + .ctl_name = CTL_UNNUMBERED, + .procname = "audit_argv_kb", + .data = &audit_argv_kb, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, +#endif { .ctl_name = KERN_CORE_PATTERN, .procname = "core_pattern", |