vsprintf: kptr_restrict is okay in IRQ when 2

The kptr_restrict flag, when set to 1, only prints the kernel address
when the user has CAP_SYSLOG.  When it is set to 2, the kernel address
is always printed as zero.  When set to 1, this needs to check whether
or not we're in IRQ.

However, when set to 2, this check is unneccessary, and produces
confusing results in dmesg.  Thus, only make sure we're not in IRQ when
mode 1 is used, but not mode 2.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 48ff9c36644d64c324c5c243212f282e406dce2f..f44e178e6edec22e2f7c405f8cb433b2be935f83 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1590,22 +1590,23 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
                        return buf;
                }
        case 'K':
-               /*
-                * %pK cannot be used in IRQ context because its test
-                * for CAP_SYSLOG would be meaningless.
-                */
-               if (kptr_restrict && (in_irq() || in_serving_softirq() ||
-                                     in_nmi())) {
-                       if (spec.field_width == -1)
-                               spec.field_width = default_width;
-                       return string(buf, end, "pK-error", spec);
-               }
-
                switch (kptr_restrict) {
                case 0:
                        /* Always print %pK values */
                        break;
                case 1: {
+                       const struct cred *cred;
+
+                       /*
+                        * kptr_restrict==1 cannot be used in IRQ context
+                        * because its test for CAP_SYSLOG would be meaningless.
+                        */
+                       if (in_irq() || in_serving_softirq() || in_nmi()) {
+                               if (spec.field_width == -1)
+                                       spec.field_width = default_width;
+                               return string(buf, end, "pK-error", spec);
+                       }
+
                        /*
                         * Only print the real pointer value if the current
                         * process has CAP_SYSLOG and is running with the
@@ -1615,8 +1616,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
                         * leak pointer values if a binary opens a file using
                         * %pK and then elevates privileges before reading it.
                         */
-                       const struct cred *cred = current_cred();
-
+                       cred = current_cred();
                        if (!has_capability_noaudit(current, CAP_SYSLOG) ||
                            !uid_eq(cred->euid, cred->uid) ||
                            !gid_eq(cred->egid, cred->gid))