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signal/alpha: Replace TRAP_FIXME with TRAP_UNK 

Using an si_code of 0 that aliases with SI_USER is clearly the wrong
thing to do, and causes problems in interesting ways.

For it really is not clear to me if using TRAP_UNK bugcheck or
the default case of gentrap is really the best way to handle
things.  There is certainly enough information that that a more
specific si_code could potentially be used.  That said TRAP_UNK
is definitely an improvement over 0 as it removes the ambiguiuty
of what si_code of 0 with SIGTRAP means on alpha.

Recent history suggests no actually cares about crazy corner cases of
the kernel behavior like this so I don't expect any regressions from
changing this.  However if something does happen this change is easy
to revert.

Cc: Helge Deller <deller@gmx.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: linux-alpha@vger.kernel.org
Fixes: 0a635c7a84cf ("Fill in siginfo_t.")
History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-04-17 17:30:31 -05:00
parent db78e6a0a6
commit 535906c684
2 changed files with 2 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/alpha/include/uapi/asm/siginfo.h
View File

@ -7,11 +7,4 @@
#include <asm-generic/siginfo.h>
/*
* SIGTRAP si_codes
*/
#ifdef __KERNEL__
#define TRAP_FIXME 0 /* Broken dup of SI_USER */
#endif /* __KERNEL__ */
#endif

4
arch/alpha/kernel/traps.c
View File

@ -288,7 +288,7 @@ do_entIF(unsigned long type, struct pt_regs *regs)
case 1: /* bugcheck */
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_FIXME;
info.si_code = TRAP_UNK;
info.si_addr = (void __user *) regs->pc;
info.si_trapno = 0;
send_sig_info(SIGTRAP, &info, current);
@ -350,7 +350,7 @@ do_entIF(unsigned long type, struct pt_regs *regs)
case GEN_SUBRNG7:
default:
signo = SIGTRAP;
code = TRAP_FIXME;
code = TRAP_UNK;
break;
}