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From: ebiederm@xmission.com (Eric W. Biederman)
To: Marco Elver <elver@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Florian Weimer <fweimer@redhat.com>,
	"David S. Miller" <davem@davemloft.net>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Collingbourne <pcc@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Alexander Potapenko <glider@google.com>,
	sparclinux <sparclinux@vger.kernel.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux API <linux-api@vger.kernel.org>,
	kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: [PATCH 2/3] signal: Implement SIL_FAULT_TRAPNO
Date: Sun, 02 May 2021 13:24:46 -0500
Message-ID: <m1sg35ngcx.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <CANpmjNNhd+qAy7tPSu=08_y-BZiowKigVkOh6HnXsxhWYuFpJA@mail.gmail.com> (Marco Elver's message of "Sat, 1 May 2021 12:33:27 +0200")

Marco Elver <elver@google.com> writes:

> On Sat, 1 May 2021 at 00:54, Eric W. Biederman <ebiederm@xmission.com> wrote:
>>
>> Now that si_trapno is part of the union in _si_fault and available on
>> all architectures, add SIL_FAULT_TRAPNO and update siginfo_layout to
>> return SIL_FAULT_TRAPNO when si_trapno is actually used.
>>
>> Update the code that uses siginfo_layout to deal with SIL_FAULT_TRAPNO
>> and have the same code ignore si_trapno in in all other cases.
>>
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>> ---
>>  fs/signalfd.c          |  7 ++-----
>>  include/linux/signal.h |  1 +
>>  kernel/signal.c        | 36 ++++++++++++++----------------------
>>  3 files changed, 17 insertions(+), 27 deletions(-)
>>
>> diff --git a/fs/signalfd.c b/fs/signalfd.c
>> index 040a1142915f..126c681a30e7 100644
>> --- a/fs/signalfd.c
>> +++ b/fs/signalfd.c
>> @@ -123,15 +123,12 @@ static int signalfd_copyinfo(struct signalfd_siginfo __user *uinfo,
>>                  */
>>         case SIL_FAULT:
>>                 new.ssi_addr = (long) kinfo->si_addr;
>> -#ifdef __ARCH_SI_TRAPNO
>> +       case SIL_FAULT_TRAPNO:
>> +               new.ssi_addr = (long) kinfo->si_addr;
>>                 new.ssi_trapno = kinfo->si_trapno;
>> -#endif
>>                 break;
>>         case SIL_FAULT_MCEERR:
>>                 new.ssi_addr = (long) kinfo->si_addr;
>> -#ifdef __ARCH_SI_TRAPNO
>> -               new.ssi_trapno = kinfo->si_trapno;
>> -#endif
>>                 new.ssi_addr_lsb = (short) kinfo->si_addr_lsb;
>>                 break;
>>         case SIL_PERF_EVENT:
>> diff --git a/include/linux/signal.h b/include/linux/signal.h
>> index 1e98548d7cf6..5160fd45e5ca 100644
>> --- a/include/linux/signal.h
>> +++ b/include/linux/signal.h
>> @@ -40,6 +40,7 @@ enum siginfo_layout {
>>         SIL_TIMER,
>>         SIL_POLL,
>>         SIL_FAULT,
>> +       SIL_FAULT_TRAPNO,
>>         SIL_FAULT_MCEERR,
>>         SIL_FAULT_BNDERR,
>>         SIL_FAULT_PKUERR,
>> diff --git a/kernel/signal.c b/kernel/signal.c
>> index c3017aa8024a..7b2d61cb7411 100644
>> --- a/kernel/signal.c
>> +++ b/kernel/signal.c
>> @@ -1194,6 +1194,7 @@ static inline bool has_si_pid_and_uid(struct kernel_siginfo *info)
>>         case SIL_TIMER:
>>         case SIL_POLL:
>>         case SIL_FAULT:
>> +       case SIL_FAULT_TRAPNO:
>>         case SIL_FAULT_MCEERR:
>>         case SIL_FAULT_BNDERR:
>>         case SIL_FAULT_PKUERR:
>> @@ -2527,6 +2528,7 @@ static void hide_si_addr_tag_bits(struct ksignal *ksig)
>>  {
>>         switch (siginfo_layout(ksig->sig, ksig->info.si_code)) {
>>         case SIL_FAULT:
>> +       case SIL_FAULT_TRAPNO:
>>         case SIL_FAULT_MCEERR:
>>         case SIL_FAULT_BNDERR:
>>         case SIL_FAULT_PKUERR:
>> @@ -3206,6 +3208,12 @@ enum siginfo_layout siginfo_layout(unsigned sig, int si_code)
>>                         if ((sig == SIGBUS) &&
>>                             (si_code >= BUS_MCEERR_AR) && (si_code <= BUS_MCEERR_AO))
>>                                 layout = SIL_FAULT_MCEERR;
>> +                       else if (IS_ENABLED(ALPHA) &&
>> +                                ((sig == SIGFPE) ||
>> +                                 ((sig == SIGTRAP) && (si_code == TRAP_UNK))))
>> +                               layout = SIL_FAULT_TRAPNO;
>> +                       else if (IS_ENABLED(SPARC) && (sig == SIGILL) && (si_code == ILL_ILLTRP))
>> +                               layout = SIL_FAULT_TRAPNO;
>
> The breakage isn't apparent here, but in later patches. These need to
> become CONFIG_SPARC and CONFIG_ALPHA.

Good catch.  For some reason I thought IS_ENABLED added the CONFIG_
prefix but I looked and it doesn't.


>>                         else if ((sig == SIGSEGV) && (si_code == SEGV_BNDERR))
>>                                 layout = SIL_FAULT_BNDERR;
>>  #ifdef SEGV_PKUERR
>> @@ -3317,30 +3325,22 @@ void copy_siginfo_to_external32(struct compat_siginfo *to,
>>                 break;
>>         case SIL_FAULT:
>>                 to->si_addr = ptr_to_compat(from->si_addr);
>> -#ifdef __ARCH_SI_TRAPNO
>> +               break;
>> +       case SIL_FAULT_TRAPNO:
>> +               to->si_addr = ptr_to_compat(from->si_addr);
>>                 to->si_trapno = from->si_trapno;
>> -#endif
>>                 break;
>>         case SIL_FAULT_MCEERR:
>>                 to->si_addr = ptr_to_compat(from->si_addr);
>> -#ifdef __ARCH_SI_TRAPNO
>> -               to->si_trapno = from->si_trapno;
>> -#endif
>>                 to->si_addr_lsb = from->si_addr_lsb;
>>                 break;
>>         case SIL_FAULT_BNDERR:
>>                 to->si_addr = ptr_to_compat(from->si_addr);
>> -#ifdef __ARCH_SI_TRAPNO
>> -               to->si_trapno = from->si_trapno;
>> -#endif
>>                 to->si_lower = ptr_to_compat(from->si_lower);
>>                 to->si_upper = ptr_to_compat(from->si_upper);
>>                 break;
>>         case SIL_FAULT_PKUERR:
>>                 to->si_addr = ptr_to_compat(from->si_addr);
>> -#ifdef __ARCH_SI_TRAPNO
>> -               to->si_trapno = from->si_trapno;
>> -#endif
>>                 to->si_pkey = from->si_pkey;
>>                 break;
>>         case SIL_PERF_EVENT:
>> @@ -3401,30 +3401,22 @@ static int post_copy_siginfo_from_user32(kernel_siginfo_t *to,
>>                 break;
>>         case SIL_FAULT:
>>                 to->si_addr = compat_ptr(from->si_addr);
>> -#ifdef __ARCH_SI_TRAPNO
>> +               break;
>> +       case SIL_FAULT_TRAPNO:
>> +               to->si_addr = compat_ptr(from->si_addr);
>>                 to->si_trapno = from->si_trapno;
>> -#endif
>>                 break;
>>         case SIL_FAULT_MCEERR:
>>                 to->si_addr = compat_ptr(from->si_addr);
>> -#ifdef __ARCH_SI_TRAPNO
>> -               to->si_trapno = from->si_trapno;
>> -#endif
>>                 to->si_addr_lsb = from->si_addr_lsb;
>>                 break;
>>         case SIL_FAULT_BNDERR:
>>                 to->si_addr = compat_ptr(from->si_addr);
>> -#ifdef __ARCH_SI_TRAPNO
>> -               to->si_trapno = from->si_trapno;
>> -#endif
>>                 to->si_lower = compat_ptr(from->si_lower);
>>                 to->si_upper = compat_ptr(from->si_upper);
>>                 break;
>>         case SIL_FAULT_PKUERR:
>>                 to->si_addr = compat_ptr(from->si_addr);
>> -#ifdef __ARCH_SI_TRAPNO
>> -               to->si_trapno = from->si_trapno;
>> -#endif
>>                 to->si_pkey = from->si_pkey;
>>                 break;
>>         case SIL_PERF_EVENT:
>> --
>> 2.30.1

  reply index

Thread overview: 118+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-29  7:48 siginfo_t ABI break on sparc64 from si_addr_lsb move 3y ago Marco Elver
2021-04-29 17:23 ` Eric W. Biederman
2021-04-29 18:46   ` Marco Elver
2021-04-29 20:48   ` Arnd Bergmann
2021-04-30 17:08     ` Eric W. Biederman
2021-04-30 19:07       ` Marco Elver
2021-04-30 20:15         ` Eric W. Biederman
2021-04-30 23:50           ` Marco Elver
2021-04-30 22:49         ` [RFC][PATCH 0/3] signal: Move si_trapno into the _si_fault union Eric W. Biederman
2021-04-30 22:50           ` [PATCH 1/3] siginfo: Move si_trapno inside the union inside _si_fault Eric W. Biederman
2021-05-01 10:31             ` Marco Elver
2021-05-02 18:27               ` Eric W. Biederman
2021-04-30 22:54           ` [PATCH 2/3] signal: Implement SIL_FAULT_TRAPNO Eric W. Biederman
2021-04-30 23:19             ` Eric W. Biederman
2021-05-01 10:33             ` Marco Elver
2021-05-02 18:24               ` Eric W. Biederman [this message]
2021-04-30 22:55           ` [PATCH 3/3] signal: Use dedicated helpers to send signals with si_trapno set Eric W. Biederman
2021-05-01 10:33             ` Marco Elver
2021-04-30 22:56           ` [PATCH 4/3] signal: Remove __ARCH_SI_TRAPNO Eric W. Biederman
2021-04-30 23:23           ` Is perf_sigtrap synchronous? Eric W. Biederman
2021-05-01  0:28             ` Marco Elver
2021-04-30 23:42           ` [PATCH 5/3] signal: Rename SIL_PERF_EVENT SIL_FAULT_PERF_EVENT for consistency Eric W. Biederman
2021-05-01 10:35             ` Marco Elver
2021-04-30 23:43           ` [PATCH 6/3] signal: Factor force_sig_perf out of perf_sigtrap Eric W. Biederman
2021-05-01 10:45             ` Marco Elver
2021-04-30 23:43           ` [PATCH 7/3] signal: Deliver all of the perf_data in si_perf Eric W. Biederman
2021-05-01 10:47             ` Marco Elver
2021-05-02 18:39               ` Eric W. Biederman
2021-05-02 19:13                 ` Marco Elver
2021-05-03 12:44                 ` Peter Zijlstra
2021-05-03 19:38                   ` Eric W. Biederman
2021-05-03 19:53                     ` Marco Elver
2021-04-30 23:47           ` [RFC][PATCH 0/3] signal: Move si_trapno into the _si_fault union Eric W. Biederman
2021-05-01  0:37             ` Marco Elver
2021-05-01 15:16               ` Eric W. Biederman
2021-05-01 16:24                 ` Marco Elver
2021-05-03 20:25                   ` [PATCH 00/12] signal: sort out si_trapno and si_perf Eric W. Biederman
2021-05-03 20:38                     ` [PATCH 01/12] sparc64: Add compile-time asserts for siginfo_t offsets Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 02/12] arm: " Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 03/12] arm64: " Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 04/12] siginfo: Move si_trapno inside the union inside _si_fault Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 05/12] signal: Implement SIL_FAULT_TRAPNO Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 06/12] signal: Use dedicated helpers to send signals with si_trapno set Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 07/12] signal: Remove __ARCH_SI_TRAPNO Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 08/12] signal: Rename SIL_PERF_EVENT SIL_FAULT_PERF_EVENT for consistency Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 09/12] signal: Factor force_sig_perf out of perf_sigtrap Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 10/12] signal: Redefine signinfo so 64bit fields are possible Eric W. Beiderman
2021-05-03 21:04                         ` Eric W. Biederman
2021-05-03 22:47                           ` Marco Elver
2021-05-04  3:42                             ` Eric W. Biederman
2021-05-04  4:03                               ` Peter Collingbourne
2021-05-04  9:52                                 ` Marco Elver
2021-05-04 16:16                                   ` Eric W. Biederman
2021-05-03 20:38                       ` [PATCH 11/12] signal: Deliver all of the siginfo perf data in _perf Eric W. Beiderman
2021-05-03 20:38                       ` [PATCH 12/12] signalfd: Remove SIL_FAULT_PERF_EVENT fields from signalfd_siginfo Eric W. Beiderman
2021-05-04 21:13                     ` [PATCH v3 00/12] signal: sort out si_trapno and si_perf Eric W. Biederman
2021-05-04 22:05                       ` Marco Elver
2021-05-05 14:12                         ` Eric W. Biederman
2021-05-05 14:10                       ` [PATCH v3 01/12] sparc64: Add compile-time asserts for siginfo_t offsets Eric W. Beiderman
2021-05-05 14:10                         ` [PATCH v3 02/12] arm: " Eric W. Beiderman
2021-05-05 14:10                         ` [PATCH v3 03/12] arm64: " Eric W. Beiderman
2021-05-05 14:10                         ` [PATCH v3 04/12] signal: Verify the alignment and size of siginfo_t Eric W. Beiderman
2021-05-05 17:24                           ` Marco Elver
2021-05-05 14:10                         ` [PATCH v3 05/12] siginfo: Move si_trapno inside the union inside _si_fault Eric W. Beiderman
2021-05-05 14:10                         ` [PATCH v3 06/12] signal: Implement SIL_FAULT_TRAPNO Eric W. Beiderman
2021-05-05 17:25                           ` Marco Elver
2021-05-05 14:10                         ` [PATCH v3 07/12] signal: Use dedicated helpers to send signals with si_trapno set Eric W. Beiderman
2021-05-05 17:25                           ` Marco Elver
2021-05-05 14:10                         ` [PATCH v3 08/12] signal: Remove __ARCH_SI_TRAPNO Eric W. Beiderman
2021-05-05 17:25                           ` Marco Elver
2021-05-05 14:10                         ` [PATCH v3 09/12] signal: Rename SIL_PERF_EVENT SIL_FAULT_PERF_EVENT for consistency Eric W. Beiderman
2021-05-05 17:26                           ` Marco Elver
2021-05-05 14:10                         ` [PATCH v3 10/12] signal: Factor force_sig_perf out of perf_sigtrap Eric W. Beiderman
2021-05-05 17:26                           ` Marco Elver
2021-05-06 10:54                           ` Peter Zijlstra
2021-05-05 14:11                         ` [PATCH v3 11/12] signal: Deliver all of the siginfo perf data in _perf Eric W. Beiderman
2021-05-05 17:27                           ` Marco Elver
2021-05-05 14:11                         ` [PATCH v3 12/12] signalfd: Remove SIL_FAULT_PERF_EVENT fields from signalfd_siginfo Eric W. Beiderman
2021-05-05 17:27                           ` Marco Elver
2021-05-05 17:28                       ` [PATCH v3 00/12] signal: sort out si_trapno and si_perf Marco Elver
2021-05-06  7:00                       ` Geert Uytterhoeven
2021-05-06 10:43                         ` Marco Elver
2021-05-06 15:28                           ` Eric W. Biederman
2021-05-06 15:14                         ` Eric W. Biederman
2021-05-14  4:54                       ` [GIT PULL] siginfo: ABI fixes for v5.13-rc2 Eric W. Biederman
2021-05-14 19:14                         ` Linus Torvalds
2021-05-14 21:15                           ` Eric W. Biederman
2021-05-14 22:38                             ` Eric W. Biederman
2021-05-16  7:40                         ` Ingo Molnar
2021-05-17 15:29                           ` Eric W. Biederman
2021-05-21 14:59                         ` [GIT PULL] siginfo: ABI fixes for v5.13-rc3 Eric W. Biederman
2021-05-21 16:34                           ` pr-tracker-bot
2021-05-17 19:56                       ` [PATCH v4 0/5] siginfo: ABI fixes for TRAP_PERF Eric W. Biederman
2021-05-17 19:57                         ` [PATCH v4 1/5] siginfo: Move si_trapno inside the union inside _si_fault Eric W. Beiderman
2021-05-17 19:57                           ` [PATCH v4 2/5] signal: Implement SIL_FAULT_TRAPNO Eric W. Beiderman
2021-05-17 19:57                           ` [PATCH v4 3/5] signal: Factor force_sig_perf out of perf_sigtrap Eric W. Beiderman
2021-05-17 19:57                           ` [PATCH v4 4/5] signal: Deliver all of the siginfo perf data in _perf Eric W. Beiderman
2021-05-17 19:57                           ` [PATCH v4 5/5] signalfd: Remove SIL_PERF_EVENT fields from signalfd_siginfo Eric W. Beiderman
2021-05-17 20:53                         ` [PATCH v4 0/5] siginfo: ABI fixes for TRAP_PERF Marco Elver
2021-05-18  3:46                           ` Eric W. Biederman
2021-05-18  6:44                             ` Marco Elver
2021-05-01 16:26               ` [RFC][PATCH 0/3] signal: Move si_trapno into the _si_fault union Marco Elver
2021-07-15 18:09           ` [PATCH 0/6] Final si_trapno bits Eric W. Biederman
2021-07-15 18:11             ` [PATCH 1/6] sparc64: Add compile-time asserts for siginfo_t offsets Eric W. Biederman
2021-07-15 18:11             ` [PATCH 2/6] arm: " Eric W. Biederman
2021-07-15 18:11             ` [PATCH 3/6] arm64: " Eric W. Biederman
2021-07-15 18:12             ` [PATCH 4/6] signal/sparc: si_trapno is only used with SIGILL ILL_ILLTRP Eric W. Biederman
2021-07-16 11:49               ` Marco Elver
2021-07-15 18:12             ` [PATCH 5/6] signal/alpha: si_trapno is only used with SIGFPE and SIGTRAP TRAP_UNK Eric W. Biederman
2021-07-16 11:48               ` Marco Elver
2021-07-15 18:13             ` [PATCH 6/6] signal: Remove the generic __ARCH_SI_TRAPNO support Eric W. Biederman
2021-07-16 11:48               ` Marco Elver
2021-07-16 11:50             ` [PATCH 0/6] Final si_trapno bits Marco Elver
2021-07-16 16:08               ` Eric W. Biederman
2021-07-16 17:15                 ` Marco Elver
2021-07-16 16:06             ` [PATCH 7/7] signal: Verify the alignment and size of siginfo_t Eric W. Biederman
2021-07-16 16:07             ` [PATCH 8/6] signal: Rename SIL_PERF_EVENT SIL_FAULT_PERF_EVENT for consistency Eric W. Biederman
2021-04-30 20:43       ` siginfo_t ABI break on sparc64 from si_addr_lsb move 3y ago Arnd Bergmann

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