signal: fix information leak in copy_siginfo_from_user32

commit 3c00cb5e68dc719f2fc73a33b1b230aadfcb1309 upstream.

This function can leak kernel stack data when the user siginfo_t has a
positive si_code value.  The top 16 bits of si_code descibe which fields
in the siginfo_t union are active, but they are treated inconsistently
between copy_siginfo_from_user32, copy_siginfo_to_user32 and
copy_siginfo_to_user.

copy_siginfo_from_user32 is called from rt_sigqueueinfo and
rt_tgsigqueueinfo in which the user has full control overthe top 16 bits
of si_code.

This fixes the following information leaks:
x86:   8 bytes leaked when sending a signal from a 32-bit process to
       itself. This leak grows to 16 bytes if the process uses x32.
       (si_code = __SI_CHLD)
x86:   100 bytes leaked when sending a signal from a 32-bit process to
       a 64-bit process. (si_code = -1)
sparc: 4 bytes leaked when sending a signal from a 32-bit process to a
       64-bit process. (si_code = any)

parsic and s390 have similar bugs, but they are not vulnerable because
rt_[tg]sigqueueinfo have checks that prevent sending a positive si_code
to a different process.  These bugs are also fixed for consistency.

Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c
index bf32174fe11fedac43eb7af3cea9a88c0eb86ece..3e6ea07a0b0f27542caf3e04e8718bc70a8cfdfc 100644 (file)
--- a/arch/arm64/kernel/signal32.c
+++ b/arch/arm64/kernel/signal32.c
@@ -196,8 +196,6 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
 
 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
 {
-       memset(to, 0, sizeof *to);
-
        if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) ||
            copy_from_user(to->_sifields._pad,
                           from->_sifields._pad, SI_PAD_SIZE))

diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index bae2e6ee2109f484e079faa21d774a18f0f2f678..6999c461d8446ceec28e284381b7e5709a0d079b 100644 (file)
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -409,8 +409,6 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
 
 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
 {
-       memset(to, 0, sizeof *to);
-
        if (copy_from_user(to, from, 3*sizeof(int)) ||
            copy_from_user(to->_sifields._pad,
                           from->_sifields._pad, SI_PAD_SIZE32))

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 1bc5a1755ed4648cfc5658e650e59dda772264b6..84d9e9bc6415d185756ca56c179bf2d0f48712e5 100644 (file)
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -966,8 +966,6 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *d, const siginfo_t *s)
 
 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
 {
-       memset(to, 0, sizeof *to);
-
        if (copy_from_user(to, from, 3*sizeof(int)) ||
            copy_from_user(to->_sifields._pad,
                           from->_sifields._pad, SI_PAD_SIZE32))

diff --git a/kernel/signal.c b/kernel/signal.c
index 11fa21958bf1e59e7622bd3360d928d9f0dcca0b..720fad0817e4134158027bd0074bdaf2c036caa2 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3013,7 +3013,7 @@ COMPAT_SYSCALL_DEFINE3(rt_sigqueueinfo,
                        int, sig,
                        struct compat_siginfo __user *, uinfo)
 {
-       siginfo_t info;
+       siginfo_t info = {};
        int ret = copy_siginfo_from_user32(&info, uinfo);
        if (unlikely(ret))
                return ret;
@@ -3059,7 +3059,7 @@ COMPAT_SYSCALL_DEFINE4(rt_tgsigqueueinfo,
                        int, sig,
                        struct compat_siginfo __user *, uinfo)
 {
-       siginfo_t info;
+       siginfo_t info = {};
 
        if (copy_siginfo_from_user32(&info, uinfo))
                return -EFAULT;