From 44be2f65d979291ffb2a47112449507ffe1f9726 Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Wed, 21 Oct 2015 17:44:25 -0400 Subject: selinux: introduce security_context_str_to_sid There seems to be a little confusion as to whether the scontext_len parameter of security_context_to_sid() includes the nul-byte or not. Reading security_context_to_sid_core(), it seems that the expectation is that it does not (both the string copying and the test for scontext_len being zero hint at that). Introduce the helper security_context_str_to_sid() to do the strlen() call and fix all callers. Signed-off-by: Rasmus Villemoes Acked-by: Stephen Smalley Signed-off-by: Paul Moore --- security/selinux/selinuxfs.c | 26 +++++++++----------------- 1 file changed, 9 insertions(+), 17 deletions(-) (limited to 'security/selinux/selinuxfs.c') diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 5bed7716f8ab..c02da25d7b63 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -731,13 +731,11 @@ static ssize_t sel_write_access(struct file *file, char *buf, size_t size) if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; - length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, - GFP_KERNEL); + length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); if (length) goto out; - length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, - GFP_KERNEL); + length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); if (length) goto out; @@ -819,13 +817,11 @@ static ssize_t sel_write_create(struct file *file, char *buf, size_t size) objname = namebuf; } - length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, - GFP_KERNEL); + length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); if (length) goto out; - length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, - GFP_KERNEL); + length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); if (length) goto out; @@ -882,13 +878,11 @@ static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; - length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, - GFP_KERNEL); + length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); if (length) goto out; - length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, - GFP_KERNEL); + length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); if (length) goto out; @@ -940,7 +934,7 @@ static ssize_t sel_write_user(struct file *file, char *buf, size_t size) if (sscanf(buf, "%s %s", con, user) != 2) goto out; - length = security_context_to_sid(con, strlen(con) + 1, &sid, GFP_KERNEL); + length = security_context_str_to_sid(con, &sid, GFP_KERNEL); if (length) goto out; @@ -1000,13 +994,11 @@ static ssize_t sel_write_member(struct file *file, char *buf, size_t size) if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; - length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, - GFP_KERNEL); + length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); if (length) goto out; - length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, - GFP_KERNEL); + length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); if (length) goto out; -- cgit v1.2.3