[PATCH v11 09/12] seccomp: Add SECCOMP_RET_TRAP

[Will Drewry <wad@chromium.org>]

Adds a new return value to seccomp filters that triggers a SIGSYS to be
delivered with the new SYS_SECCOMP si_code.

This allows in-process system call emulation, including just specifying
an errno or cleanly dumping core, rather than just dying.

v11: - clarify the comment (indan@nul.nu)
     - s/sigtrap/sigsys
v10: - use SIGSYS, syscall_get_arch, updates arch/Kconfig
       note suggested-by (though original suggestion had other behaviors)
v9:  - changes to SIGILL
v8:  - clean up based on changes to dependent patches
v7:  - introduction

Suggested-by: Markus Gutschke <markus@chromium.org>
Suggested-by: Julien Tinnes <jln@chromium.org>
Signed-off-by: Will Drewry <wad@chromium.org>
---
 arch/Kconfig                  |   14 +++++++++-----
 include/asm-generic/siginfo.h |    2 +-
 include/linux/seccomp.h       |    1 +
 kernel/seccomp.c              |   28 ++++++++++++++++++++++++++++
 4 files changed, 39 insertions(+), 6 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index dd4e067..d92a78e 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -202,11 +202,15 @@ config HAVE_CMPXCHG_DOUBLE
 config HAVE_ARCH_SECCOMP_FILTER
 	bool
 	help
-	  This symbol should be selected by an architecure if it provides
-	  asm/syscall.h, specifically syscall_get_arguments(),
-	  syscall_get_arch(), and syscall_set_return_value().  Additionally,
-	  its system call entry path must respect a return value of -1 from
-	  __secure_computing_int() and/or secure_computing().
+	  This symbol should be selected by an architecure if it provides:
+	  asm/syscall.h:
+	  - syscall_get_arch()
+	  - syscall_get_arguments()
+	  - syscall_rollback()
+	  - syscall_set_return_value()
+	  SIGSYS siginfo_t support must be implemented.
+	  __secure_computing_int()/secure_computing()'s return value must be
+	  checked, with -1 resulting in the syscall being skipped.
 
 config SECCOMP_FILTER
 	def_bool y
diff --git a/include/asm-generic/siginfo.h b/include/asm-generic/siginfo.h
index 31306f5..af5d035 100644
--- a/include/asm-generic/siginfo.h
+++ b/include/asm-generic/siginfo.h
@@ -93,7 +93,7 @@ typedef struct siginfo {
 
 		/* SIGSYS */
 		struct {
-			void __user *_call_addr; /* calling insn */
+			void __user *_call_addr; /* calling user insn */
 			int _syscall;	/* triggering system call number */
 			unsigned int _arch;	/* AUDIT_ARCH_* of syscall */
 		} _sigsys;
diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index 93c2d98..b44d038 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -19,6 +19,7 @@
  * selects the least permissive choice.
  */
 #define SECCOMP_RET_KILL	0x00000000U /* kill the task immediately */
+#define SECCOMP_RET_TRAP	0x00020000U /* disallow and force a SIGSYS */
 #define SECCOMP_RET_ERRNO	0x00030000U /* returns an errno */
 #define SECCOMP_RET_ALLOW	0x7fff0000U /* allow */
 
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 3b3a16e..d2e173e 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -272,6 +272,26 @@ void copy_seccomp(struct seccomp *child, const struct seccomp *parent)
 	/* Other fields are handled by dup_task_struct. */
 	child->filter = get_seccomp_filter(parent->filter);
 }
+
+/**
+ * seccomp_send_sigsys - signals the task to allow in-process syscall emulation
+ * @syscall: syscall number to send to userland
+ * @reason: filter-supplied reason code to send to userland (via si_errno)
+ *
+ * Forces a SIGSYS with a code of SYS_SECCOMP and related sigsys info.
+ */
+static void seccomp_send_sigsys(int syscall, int reason)
+{
+	struct siginfo info;
+	memset(&info, 0, sizeof(info));
+	info.si_signo = SIGSYS;
+	info.si_code = SYS_SECCOMP;
+	info.si_call_addr = (void __user *)KSTK_EIP(current);
+	info.si_errno = reason;
+	info.si_arch = syscall_get_arch(current, task_pt_regs(current));
+	info.si_syscall = syscall;
+	force_sig_info(SIGSYS, &info, current);
+}
 #endif	/* CONFIG_SECCOMP_FILTER */
 
 /*
@@ -326,6 +346,14 @@ int __secure_computing_int(int this_syscall)
 						 -(action & SECCOMP_RET_DATA),
 						 0);
 			return -1;
+		case SECCOMP_RET_TRAP: {
+			int reason_code = action & SECCOMP_RET_DATA;
+			/* Show the handler the original registers. */
+			syscall_rollback(current, task_pt_regs(current));
+			/* Let the filter pass back 16 bits of data. */
+			seccomp_send_sigsys(this_syscall, reason_code);
+			return -1;
+		}
 		case SECCOMP_RET_ALLOW:
 			return 0;
 		case SECCOMP_RET_KILL:
-- 
1.7.5.4