sparc: fix compat siginfo ABI regression

Starting with commit v4.14-rc1~60^2^2~1, a SIGFPE signal sent via kill
results to wrong values in si_pid and si_uid fields of compat siginfo_t.

This happens due to FPE_FIXME being defined to 0 for sparc, and at the
same time siginfo_layout() introduced by the same commit returns
SIL_FAULT for SIGFPE if si_code == SI_USER and FPE_FIXME is defined to 0.

Fix this regression by removing FPE_FIXME macro and changing all its users
to assign FPE_FLTUNK to si_code instead of FPE_FIXME.

Note that FPE_FLTUNK is a new macro introduced by commit
266da65e9156d93e1126e185259a4aae68188d0e.

Tested with commit v4.16-11958-g16e205cf42da.

This bug was found by strace test suite.

In the discussion about FPE_FLTUNK on sparc David Miller said:
> Eric, feel free to do something similar on Sparc.

Link: https://github.com/strace/strace/issues/21
Fixes: cc731525f26a ("signal: Remove kernel interal si_code magic")
Fixes: 2.3.41
Cc: David Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Conceptually-Acked-By: David Miller <davem@davemloft.net>
Thanks-to: Anatoly Pugachev <matorola@gmail.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

diff --git a/arch/sparc/include/uapi/asm/siginfo.h b/arch/sparc/include/uapi/asm/siginfo.h
index 896ce44..e704955 100644 (file)
--- a/arch/sparc/include/uapi/asm/siginfo.h
+++ b/arch/sparc/include/uapi/asm/siginfo.h
@@ -18,13 +18,6 @@
 #define SI_NOINFO      32767           /* no information in siginfo_t */
 
 /*
- * SIGFPE si_codes
- */
-#ifdef __KERNEL__
-#define FPE_FIXME      0       /* Broken dup of SI_USER */
-#endif /* __KERNEL__ */
-
-/*
  * SIGEMT si_codes
  */
 #define EMT_TAGOVF     1       /* tag overflow */

diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
index b1ed763..33cd35b 100644 (file)
--- a/arch/sparc/kernel/traps_32.c
+++ b/arch/sparc/kernel/traps_32.c
@@ -307,7 +307,7 @@ void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
        info.si_errno = 0;
        info.si_addr = (void __user *)pc;
        info.si_trapno = 0;
-       info.si_code = FPE_FIXME;
+       info.si_code = FPE_FLTUNK;
        if ((fsr & 0x1c000) == (1 << 14)) {
                if (fsr & 0x10)
                        info.si_code = FPE_FLTINV;

diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index 462a21a..e81072a 100644 (file)
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -2372,7 +2372,7 @@ static void do_fpe_common(struct pt_regs *regs)
                info.si_errno = 0;
                info.si_addr = (void __user *)regs->tpc;
                info.si_trapno = 0;
-               info.si_code = FPE_FIXME;
+               info.si_code = FPE_FLTUNK;
                if ((fsr & 0x1c000) == (1 << 14)) {
                        if (fsr & 0x10)
                                info.si_code = FPE_FLTINV;