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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 <linux@rasmusvillemoes.dk>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Rasmus Villemoes 2015-10-21 17:44:25 -04:00 committed by Paul Moore
parent 44d37ad360
commit 44be2f65d9
4 changed files with 20 additions and 25 deletions
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12
security/selinux/hooks.c
View File

@ -674,10 +674,9 @@ static int selinux_set_mnt_opts(struct super_block *sb,
if (flags[i] == SBLABEL_MNT)
continue;
rc = security_context_to_sid(mount_options[i],
strlen(mount_options[i]), &sid, GFP_KERNEL);
rc = security_context_str_to_sid(mount_options[i], &sid, GFP_KERNEL);
if (rc) {
printk(KERN_WARNING "SELinux: security_context_to_sid"
printk(KERN_WARNING "SELinux: security_context_str_to_sid"
"(%s) failed for (dev %s, type %s) errno=%d\n",
mount_options[i], sb->s_id, name, rc);
goto out;
@ -2617,15 +2616,12 @@ static int selinux_sb_remount(struct super_block *sb, void *data)
for (i = 0; i < opts.num_mnt_opts; i++) {
u32 sid;
size_t len;
if (flags[i] == SBLABEL_MNT)
continue;
len = strlen(mount_options[i]);
rc = security_context_to_sid(mount_options[i], len, &sid,
GFP_KERNEL);
rc = security_context_str_to_sid(mount_options[i], &sid, GFP_KERNEL);
if (rc) {
printk(KERN_WARNING "SELinux: security_context_to_sid"
printk(KERN_WARNING "SELinux: security_context_str_to_sid"
"(%s) failed for (dev %s, type %s) errno=%d\n",
mount_options[i], sb->s_id, sb->s_type->name, rc);
goto out_free_opts;

2
security/selinux/include/security.h
View File

@ -166,6 +166,8 @@ int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
int security_context_to_sid(const char *scontext, u32 scontext_len,
u32 *out_sid, gfp_t gfp);
int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
int security_context_to_sid_default(const char *scontext, u32 scontext_len,
u32 *out_sid, u32 def_sid, gfp_t gfp_flags);

26
security/selinux/selinuxfs.c
View File

@ -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;

5
security/selinux/ss/services.c
View File

@ -1476,6 +1476,11 @@ int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid,
sid, SECSID_NULL, gfp, 0);
}
int security_context_str_to_sid(const char *scontext, u32 *sid, gfp_t gfp)
{
return security_context_to_sid(scontext, strlen(scontext), sid, gfp);
}
/**
* security_context_to_sid_default - Obtain a SID for a given security context,
* falling back to specified default if needed.