Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755636Ab3JCVLG (ORCPT ); Thu, 3 Oct 2013 17:11:06 -0400 Received: from mail-pa0-f50.google.com ([209.85.220.50]:56176 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755606Ab3JCVLD (ORCPT ); Thu, 3 Oct 2013 17:11:03 -0400 From: Sebastian Capella To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linaro-kernel@lists.linaro.org, patches@linaro.org Cc: Sebastian Capella , "Eric W. Biederman" , Serge Hallyn , Andrew Morton , Stephen Warren , Jens Axboe , Greg Kroah-Hartman , Al Viro Subject: [PATCH v3 1/2] init/do_mounts.c: ignore final \n in name_to_dev_t Date: Thu, 3 Oct 2013 14:10:37 -0700 Message-Id: <1380834638-24035-2-git-send-email-sebastian.capella@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1380834638-24035-1-git-send-email-sebastian.capella@linaro.org> References: <1380834638-24035-1-git-send-email-sebastian.capella@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3149 Lines: 112 Enhance name_to_dev_t to handle trailing newline characters on device paths. Some inputs to name_to_dev_t may come from userspace where oftentimes a '\n' is appended to the path. Added const to the name buffer in both the function declaration and the prototype to reflect input buffer handling. By handling trailing newlines in name_to_dev_t, userspace buffers may be directly passed to name_to_dev_t without modification. Signed-off-by: Sebastian Capella Reviewed-by: Pavel Machek Cc: "Eric W. Biederman" Cc: Serge Hallyn Cc: Andrew Morton Cc: Stephen Warren Cc: Jens Axboe Cc: Greg Kroah-Hartman Cc: Al Viro --- include/linux/mount.h | 2 +- init/do_mounts.c | 25 +++++++++++++++++++------ 2 files changed, 20 insertions(+), 7 deletions(-) diff --git a/include/linux/mount.h b/include/linux/mount.h index 38cd98f..fdbb3e6 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -77,6 +77,6 @@ extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list); extern void mark_mounts_for_expiry(struct list_head *mounts); -extern dev_t name_to_dev_t(char *name); +extern dev_t name_to_dev_t(const char *name); #endif /* _LINUX_MOUNT_H */ diff --git a/init/do_mounts.c b/init/do_mounts.c index a51cddc..69d74ff 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -145,6 +145,13 @@ static dev_t devt_from_partuuid(const char *uuid_str) clear_root_wait = true; goto done; } + if (uuid_str[cmp.len - 1] == '\n') { + cmp.len--; + if (!cmp.len) { + clear_root_wait = true; + goto done; + } + } dev = class_find_device(&block_class, NULL, &cmp, &match_dev_by_uuid); @@ -204,12 +211,13 @@ done: * bangs. */ -dev_t name_to_dev_t(char *name) +dev_t name_to_dev_t(const char *name) { char s[32]; char *p; dev_t res = 0; int part; + int n; #ifdef CONFIG_BLOCK if (strncmp(name, "PARTUUID=", 9) == 0) { @@ -230,7 +238,7 @@ dev_t name_to_dev_t(char *name) goto fail; } else { res = new_decode_dev(simple_strtoul(name, &p, 16)); - if (*p) + if (*p && *p != '\n') goto fail; } goto done; @@ -238,15 +246,20 @@ dev_t name_to_dev_t(char *name) name += 5; res = Root_NFS; - if (strcmp(name, "nfs") == 0) + if (strncmp(name, "nfs", 3) == 0) goto done; res = Root_RAM0; - if (strcmp(name, "ram") == 0) + if (strncmp(name, "ram", 3) == 0) goto done; - if (strlen(name) > 31) + n = strlen(name); + if (n != 0 && name[n - 1] == '\n') + n--; + if (n > 31) goto fail; - strcpy(s, name); + strncpy(s, name, n); + s[n] = '\0'; + for (p = s; *p; p++) if (*p == '/') *p = '!'; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/