uClibc: add signal info for seccomp related SIGSYS

uClibc doesn't define signal info for the SIGSYS signal which is issued
in case of hitting a syscall prohibited by seccomp.
This is sad as it makes debugging seccomp filter policies impossible on
some architectures (at least ARM and PowerPC, maybe also others) which
do not coincidentally set si_value.sival_int as the syscall number.

To fix this, import the definitions and macros needed from glibc.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45720 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/toolchain/uClibc/patches-0.9.33.2/995-add-sigsys-to-siginfo_t-union.patch b/toolchain/uClibc/patches-0.9.33.2/995-add-sigsys-to-siginfo_t-union.patch
new file mode 100644 (file)
index 0000000..4894a56
--- /dev/null
+++ b/toolchain/uClibc/patches-0.9.33.2/995-add-sigsys-to-siginfo_t-union.patch
@@ -0,0 +1,145 @@
+Index: uClibc/libc/sysdeps/linux/common/bits/siginfo.h
+===================================================================
+--- uClibc.orig/libc/sysdeps/linux/common/bits/siginfo.h
++++ uClibc/libc/sysdeps/linux/common/bits/siginfo.h
+@@ -104,6 +104,14 @@ typedef struct siginfo
+           long int si_band;   /* Band event for SIGPOLL.  */
+           int si_fd;
+         } _sigpoll;
++
++      /* SIGSYS.  */
++      struct
++        {
++          void *_call_addr;   /* Calling user insn.  */
++          int _syscall;       /* Triggering system call number.  */
++          unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
++        } _sigsys;
+       } _sifields;
+   } siginfo_t;
+ 
+@@ -122,6 +130,9 @@ typedef struct siginfo
+ # define si_addr      _sifields._sigfault.si_addr
+ # define si_band      _sifields._sigpoll.si_band
+ # define si_fd                _sifields._sigpoll.si_fd
++# define si_call_addr _sifields._sigsys._call_addr
++# define si_syscall   _sifields._sigsys._syscall
++# define si_arch      _sifields._sigsys._arch
+ 
+ 
+ /* Values for `si_code'.  Positive values are reserved for kernel-generated
+Index: uClibc/libc/sysdeps/linux/alpha/bits/siginfo.h
+===================================================================
+--- uClibc.orig/libc/sysdeps/linux/alpha/bits/siginfo.h
++++ uClibc/libc/sysdeps/linux/alpha/bits/siginfo.h
+@@ -98,6 +98,14 @@ typedef struct siginfo
+           int si_band;        /* Band event for SIGPOLL.  */
+           int si_fd;
+         } _sigpoll;
++
++      /* SIGSYS.  */
++      struct
++        {
++          void *_call_addr;   /* Calling user insn.  */
++          int _syscall;       /* Triggering system call number.  */
++          unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
++        } _sigsys;
+       } _sifields;
+   } siginfo_t;
+ 
+@@ -116,6 +124,9 @@ typedef struct siginfo
+ # define si_addr      _sifields._sigfault.si_addr
+ # define si_band      _sifields._sigpoll.si_band
+ # define si_fd                _sifields._sigpoll.si_fd
++# define si_call_addr _sifields._sigsys._call_addr
++# define si_syscall   _sifields._sigsys._syscall
++# define si_arch      _sifields._sigsys._arch
+ 
+ 
+ /* Values for `si_code'.  Positive values are reserved for kernel-generated
+Index: uClibc/libc/sysdeps/linux/ia64/bits/siginfo.h
+===================================================================
+--- uClibc.orig/libc/sysdeps/linux/ia64/bits/siginfo.h
++++ uClibc/libc/sysdeps/linux/ia64/bits/siginfo.h
+@@ -103,6 +103,14 @@ typedef struct siginfo
+           long int si_band;   /* Band event for SIGPOLL.  */
+           int si_fd;
+         } _sigpoll;
++
++      /* SIGSYS.  */
++      struct
++        {
++          void *_call_addr;   /* Calling user insn.  */
++          int _syscall;       /* Triggering system call number.  */
++          unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
++        } _sigsys;
+       } _sifields;
+   } siginfo_t;
+ 
+@@ -121,6 +129,9 @@ typedef struct siginfo
+ # define si_addr      _sifields._sigfault.si_addr
+ # define si_band      _sifields._sigpoll.si_band
+ # define si_fd                _sifields._sigpoll.si_fd
++# define si_call_addr _sifields._sigsys._call_addr
++# define si_syscall   _sifields._sigsys._syscall
++# define si_arch      _sifields._sigsys._arch
+ 
+ # ifdef __USE_GNU
+ #  define si_imm      _sifields._sigfault._si_imm
+Index: uClibc/libc/sysdeps/linux/mips/bits/siginfo.h
+===================================================================
+--- uClibc.orig/libc/sysdeps/linux/mips/bits/siginfo.h
++++ uClibc/libc/sysdeps/linux/mips/bits/siginfo.h
+@@ -107,6 +107,14 @@ typedef struct siginfo
+           __uid_t si_uid;     /* Real user ID of sending process.  */
+           sigval_t si_sigval; /* Signal value.  */
+         } _rt;
++
++      /* SIGSYS.  */
++      struct
++        {
++          void *_call_addr;   /* Calling user insn.  */
++          int _syscall;       /* Triggering system call number.  */
++          unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
++        } _sigsys;
+       } _sifields;
+   } siginfo_t;
+ 
+@@ -123,6 +131,9 @@ typedef struct siginfo
+ # define si_addr      _sifields._sigfault.si_addr
+ # define si_band      _sifields._sigpoll.si_band
+ # define si_fd                _sifields._sigpoll.si_fd
++# define si_call_addr _sifields._sigsys._call_addr
++# define si_syscall   _sifields._sigsys._syscall
++# define si_arch      _sifields._sigsys._arch
+ 
+ 
+ /* Values for `si_code'.  Positive values are reserved for kernel-generated
+Index: uClibc/libc/sysdeps/linux/sparc/bits/siginfo.h
+===================================================================
+--- uClibc.orig/libc/sysdeps/linux/sparc/bits/siginfo.h
++++ uClibc/libc/sysdeps/linux/sparc/bits/siginfo.h
+@@ -105,6 +105,14 @@ typedef struct siginfo
+           int si_band;        /* Band event for SIGPOLL.  */
+           int si_fd;
+         } _sigpoll;
++
++      /* SIGSYS.  */
++      struct
++        {
++          void *_call_addr;   /* Calling user insn.  */
++          int _syscall;       /* Triggering system call number.  */
++          unsigned int _arch; /* AUDIT_ARCH_* of syscall.  */
++        } _sigsys;
+       } _sifields;
+   } siginfo_t;
+ 
+@@ -124,6 +132,9 @@ typedef struct siginfo
+ # define si_trapno    _sifields._sigfault.si_trapno
+ # define si_band      _sifields._sigpoll.si_band
+ # define si_fd                _sifields._sigpoll.si_fd
++# define si_call_addr _sifields._sigsys._call_addr
++# define si_syscall   _sifields._sigsys._syscall
++# define si_arch      _sifields._sigsys._arch
+ 
+ 
+ /* Values for `si_code'.  Positive values are reserved for kernel-generated