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From: Dave Hansen <dave.hansen@intel.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>,
	linux-kernel@vger.kernel.org
Cc: Al Viro <viro@zeniv.linux.org.uk>,
	Oleg Nesterov <oleg@redhat.com>,
	linux-arch@vger.kernel.org
Subject: Re: [PATCH 13/22] signal: Move addr_lsb into the _sigfault union for clarity
Date: Fri, 16 Mar 2018 12:00:16 -0700	[thread overview]
Message-ID: <29eb3438-0891-36ee-e5f6-36e26ccf2b89@intel.com> (raw)
In-Reply-To: <20180116004009.31036-13-ebiederm@xmission.com>

On 01/15/2018 04:40 PM, Eric W. Biederman wrote:
> The addr_lsb fields is only valid and available when the
> signal is SIGBUS and the si_code is BUS_MCEERR_AR or BUS_MCEERR_AO.
> Document this with a comment and place the field in the _sigfault union
> to make this clear.
> 
> All of the fields stay in the same physical location so both the old
> and new definitions of struct siginfo will continue to work.

This breaks the ABI and breaks protection keys.  The physical locations
*DO* change.

Before this patch:

#define si_pkey         _sifields._sigfault._pkey
(gdb) print &((siginfo_t *)0)->_sifields._sigfault._pkey
$1 = (__u32 *) 0x20 <irq_stack_union+32>

and after:

+#define si_pkey                _sifields._sigfault._addr_pkey._pkey
(gdb) print &((siginfo_t *)0)->_sifields._sigfault._addr_pkey._pkey
$1 = (__u32 *) 0x1c

Can we revert this, please?

  reply	other threads:[~2018-03-16 19:00 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-12  0:57 [PATCH 00/11] siginfo fixes/cleanups esp SI_USER Eric W. Biederman
2018-01-12  0:59 ` [PATCH 01/11] signal: Simplify and fix kdb_send_sig Eric W. Biederman
2018-01-12  0:59 ` [PATCH 02/11] signal/sh: Ensure si_signo is initialized in do_divide_error Eric W. Biederman
2018-01-12  0:59 ` [PATCH 03/11] signal/openrisc: Fix do_unaligned_access to send the proper signal Eric W. Biederman
2018-01-12 13:25   ` Stafford Horne
2018-01-12 17:37     ` Eric W. Biederman
2018-01-12  0:59 ` [PATCH 04/11] signal/parisc: Document a conflict with SI_USER with SIGFPE Eric W. Biederman
2018-01-12 22:29   ` Helge Deller
2018-01-13 21:06     ` Eric W. Biederman
2018-01-14  1:46       ` Eric W. Biederman
2018-02-23  0:15     ` Eric W. Biederman
2018-02-25 19:49       ` Helge Deller
2018-02-27  2:19         ` Eric W. Biederman
2018-01-12  0:59 ` [PATCH 05/11] signal/metag: " Eric W. Biederman
2018-01-12  0:59 ` [PATCH 06/11] signal/powerpc: Document conflicts with SI_USER and SIGFPE and SIGTRAP Eric W. Biederman
2018-01-12  0:59 ` [PATCH 07/11] signal/arm64: Document conflicts with SI_USER and SIGFPE,SIGTRAP,SIGBUS Eric W. Biederman
2018-01-15 16:30   ` [PATCH 07/11] signal/arm64: Document conflicts with SI_USER and SIGFPE, SIGTRAP, SIGBUS Dave Martin
2018-01-15 17:23     ` Eric W. Biederman
2018-01-16 17:24       ` Dave Martin
2018-01-16 22:28         ` Eric W. Biederman
2018-01-17 11:46           ` Dave Martin
2018-01-17 11:57           ` Russell King - ARM Linux
2018-01-17 12:15             ` Dave Martin
2018-01-17 12:37               ` Russell King - ARM Linux
2018-01-17 15:37                 ` Dave Martin
2018-01-17 15:49                   ` Russell King - ARM Linux
2018-01-17 16:11                     ` Dave Martin
2018-01-17 16:45                 ` Eric W. Biederman
2018-01-17 17:14                   ` Russell King - ARM Linux
2018-01-24 21:28                     ` Eric W. Biederman
2018-01-17 17:17       ` Dave Martin
2018-01-17 17:24         ` Eric W. Biederman
2018-01-17 17:39           ` Dave Martin
2018-01-15 19:30     ` James Morse
2018-01-12  0:59 ` [PATCH 08/11] signal/arm: Document conflicts with SI_USER and SIGFPE Eric W. Biederman
2018-01-15 17:49   ` Russell King - ARM Linux
2018-01-15 20:12     ` Eric W. Biederman
2018-01-16 17:41     ` Dave Martin
2018-01-19 12:05     ` Dave Martin
2018-01-12  0:59 ` [PATCH 09/11] signal: Reduce copy_siginfo to just a memcpy Eric W. Biederman
2018-01-12  0:59 ` [PATCH 10/11] signal: Introduce clear_siginfo Eric W. Biederman
2018-01-12  0:59 ` [PATCH 11/11] signal: Ensure generic siginfos the kernel sends have all bits initialized Eric W. Biederman
2018-01-12 20:29 ` [PATCH 0/2] siginfo fixes Eric W. Biederman
2018-01-12 20:31   ` [PATCH 1/2] mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy Eric W. Biederman
2018-01-12 20:31   ` [PATCH 2/2] x86/mm/pkeys: Fix fill_sig_info_pkey Eric W. Biederman
2018-01-14 11:44     ` [tip:x86/urgent] " tip-bot for Eric W. Biederman
2018-01-16  0:39   ` [PATCH 00/22] siginfo unification Eric W. Biederman
2018-01-16  0:39     ` [PATCH 01/22] signal: Document all of the signals that use the _sigfault union member Eric W. Biederman
2018-01-16  0:39     ` [PATCH 02/22] signal: Document the strange si_codes used by ptrace event stops Eric W. Biederman
2018-01-16  0:39     ` [PATCH 03/22] signal: Document glibc's si_code of SI_ASYNCNL Eric W. Biederman
2018-01-16  0:39     ` [PATCH 04/22] signal: Ensure no siginfo union member increases the size of struct siginfo Eric W. Biederman
2018-01-16  0:39     ` [PATCH 05/22] signal: Clear si_sys_private before copying siginfo to userspace Eric W. Biederman
2018-01-16  0:39     ` [PATCH 06/22] signal: Remove _sys_private and _overrun_incr from struct compat_siginfo Eric W. Biederman
2018-01-16  0:39     ` [PATCH 07/22] ia64/signal: switch to generic struct siginfo Eric W. Biederman
2018-01-16  0:39     ` [PATCH 08/22] signal/ia64: switch the last arch-specific copy_siginfo_to_user() to generic version Eric W. Biederman
2018-01-16  0:39     ` [PATCH 09/22] signal/mips: switch mips to generic siginfo Eric W. Biederman
2018-01-16  0:39     ` [PATCH 10/22] signal: Remove unnecessary ifdefs now that there is only one struct siginfo Eric W. Biederman
2018-01-16  0:39     ` [PATCH 11/22] signal: kill __ARCH_SI_UID_T Eric W. Biederman
2018-01-16  0:39     ` [PATCH 12/22] signal: unify compat_siginfo_t Eric W. Biederman
2018-01-16  0:40     ` [PATCH 13/22] signal: Move addr_lsb into the _sigfault union for clarity Eric W. Biederman
2018-03-16 19:00       ` Dave Hansen [this message]
2018-03-16 19:24         ` Dave Hansen
2018-03-16 20:06           ` Eric W. Biederman
2018-03-16 20:33             ` Dave Hansen
2018-03-16 21:08               ` Eric W. Biederman
2018-01-16  0:40     ` [PATCH 14/22] signal/powerpc: Remove redefinition of NSIGTRAP on powerpc Eric W. Biederman
2018-01-16  0:40     ` [PATCH 15/22] signal/ia64: Move the ia64 specific si_codes to asm-generic/siginfo.h Eric W. Biederman
2018-01-16  0:40     ` [PATCH 16/22] signal/frv: Move the frv " Eric W. Biederman
2018-01-16  0:40     ` [PATCH 17/22] signal/tile: Move the tile " Eric W. Biederman
2018-01-16  0:40     ` [PATCH 18/22] signal/blackfin: Move the blackfin " Eric W. Biederman
2018-01-16  0:40     ` [PATCH 19/22] signal/blackfin: Remove pointless UID16_SIGINFO_COMPAT_NEEDED Eric W. Biederman
2018-01-16  0:40     ` [PATCH 20/22] signal: Unify and correct copy_siginfo_from_user32 Eric W. Biederman
2018-01-16  0:40     ` [PATCH 21/22] signal: Remove the code to clear siginfo before calling copy_siginfo_from_user32 Eric W. Biederman
2018-01-16  0:40     ` [PATCH 22/22] signal: Unify and correct copy_siginfo_to_user32 Eric W. Biederman
2018-01-19 18:03       ` Al Viro
2018-01-19 21:04         ` Eric W. Biederman
2018-01-23 21:05     ` [PATCH 00/10] siginfo infrastructure Eric W. Biederman
2018-01-23 21:07       ` [PATCH 01/10] ptrace: Use copy_siginfo in setsiginfo and getsiginfo Eric W. Biederman
2018-01-23 21:07       ` [PATCH 02/10] signal/arm64: Better isolate the COMPAT_TASK portion of ptrace_hbptriggered Eric W. Biederman
2018-01-23 21:07       ` [PATCH 03/10] signal: Don't use structure initializers for struct siginfo Eric W. Biederman
2018-01-23 21:07       ` [PATCH 04/10] signal: Replace memset(info,...) with clear_siginfo for clarity Eric W. Biederman
2018-01-23 21:07       ` [PATCH 05/10] signal: Add send_sig_fault and force_sig_fault Eric W. Biederman
2018-01-23 21:07       ` [PATCH 06/10] signal: Helpers for faults with specialized siginfo layouts Eric W. Biederman
2018-01-24 19:26         ` Ram Pai
2018-01-24 20:54           ` Eric W. Biederman
2018-01-23 21:07       ` [PATCH 07/10] signal/powerpc: Remove unnecessary signal_code parameter of do_send_trap Eric W. Biederman
2018-01-23 21:07       ` [PATCH 08/10] signal/ptrace: Add force_sig_ptrace_errno_trap and use it where needed Eric W. Biederman
2018-01-23 21:07       ` [PATCH 09/10] mm/memory_failure: Remove unused trapno from memory_failure Eric W. Biederman
2018-01-23 21:07       ` [PATCH 10/10] signal/memory-failure: Use force_sig_mceerr and send_sig_mceerr Eric W. Biederman

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