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Message-ID: <CANpmjNNhd+qAy7tPSu=08_y-BZiowKigVkOh6HnXsxhWYuFpJA@mail.gmail.com>
Date: Sat, 1 May 2021 12:33:27 +0200
From: Marco Elver <elver@...gle.com>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Arnd Bergmann <arnd@...db.de>, Florian Weimer <fweimer@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Collingbourne <pcc@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
sparclinux <sparclinux@...r.kernel.org>,
linux-arch <linux-arch@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux API <linux-api@...r.kernel.org>,
kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [PATCH 2/3] signal: Implement SIL_FAULT_TRAPNO
On Sat, 1 May 2021 at 00:54, Eric W. Biederman <ebiederm@...ssion.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@...ssion.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.
> 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
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