From: Arnd Bergmann <arnd@arndb.de> To: Christoph Hellwig <hch@lst.de> Cc: Andrew Morton <akpm@linux-foundation.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Jeremy Kerr <jk@ozlabs.org>, "Eric W . Biederman" <ebiederm@xmission.com>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 4/8] binfmt_elf: open code copy_siginfo_to_user to kernelspace buffer Date: Tue, 14 Apr 2020 15:15:09 +0200 [thread overview] Message-ID: <CAK8P3a3HvbPKTkwfWr6PbZ96koO_NrJP1qgk8H1mgk=qUScGkQ@mail.gmail.com> (raw) In-Reply-To: <20200414070142.288696-5-hch@lst.de> On Tue, Apr 14, 2020 at 9:02 AM Christoph Hellwig <hch@lst.de> wrote: > > Instead of messing with the address limit just open code the trivial > memcpy + memset logic for the native version, and a call to > to_compat_siginfo for the compat version. > > Signed-off-by: Christoph Hellwig <hch@lst.de> Nice! > */ > #define user_long_t compat_long_t > #define user_siginfo_t compat_siginfo_t > -#define copy_siginfo_to_user copy_siginfo_to_user32 > +#define fill_siginfo_note(note, csigdata, siginfo) \ > +do { \ > + to_compat_siginfo(csigdata, siginfo, compat_siginfo_flags()); \ > + fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); \ > +} while (0) I don't think you are changing the behavior here, but I still wonder if it is in fact correct for x32: is in_x32_syscall() true here when dumping an x32 compat elf process, or should this rather be set according to which binfmt_elf copy is being used? Arnd
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de> To: Christoph Hellwig <hch@lst.de> Cc: Jeremy Kerr <jk@ozlabs.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "Eric W . Biederman" <ebiederm@xmission.com>, Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, Alexander Viro <viro@zeniv.linux.org.uk> Subject: Re: [PATCH 4/8] binfmt_elf: open code copy_siginfo_to_user to kernelspace buffer Date: Tue, 14 Apr 2020 15:15:09 +0200 [thread overview] Message-ID: <CAK8P3a3HvbPKTkwfWr6PbZ96koO_NrJP1qgk8H1mgk=qUScGkQ@mail.gmail.com> (raw) In-Reply-To: <20200414070142.288696-5-hch@lst.de> On Tue, Apr 14, 2020 at 9:02 AM Christoph Hellwig <hch@lst.de> wrote: > > Instead of messing with the address limit just open code the trivial > memcpy + memset logic for the native version, and a call to > to_compat_siginfo for the compat version. > > Signed-off-by: Christoph Hellwig <hch@lst.de> Nice! > */ > #define user_long_t compat_long_t > #define user_siginfo_t compat_siginfo_t > -#define copy_siginfo_to_user copy_siginfo_to_user32 > +#define fill_siginfo_note(note, csigdata, siginfo) \ > +do { \ > + to_compat_siginfo(csigdata, siginfo, compat_siginfo_flags()); \ > + fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); \ > +} while (0) I don't think you are changing the behavior here, but I still wonder if it is in fact correct for x32: is in_x32_syscall() true here when dumping an x32 compat elf process, or should this rather be set according to which binfmt_elf copy is being used? Arnd
next prev parent reply other threads:[~2020-04-14 13:38 UTC|newest] Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-04-14 7:01 remove set_fs calls from the exec and coredump code v2 Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-14 7:01 ` [PATCH 1/8] powerpc/spufs: simplify spufs core dumping Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-14 7:01 ` [PATCH 2/8] signal: clean up __copy_siginfo_to_user32 Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-17 21:08 ` Eric W. Biederman 2020-04-17 21:08 ` Eric W. Biederman 2020-04-17 21:09 ` [PATCH 1/2] signal: Factor copy_siginfo_to_external32 from copy_siginfo_to_user32 Eric W. Biederman 2020-04-17 21:09 ` Eric W. Biederman 2020-04-18 8:05 ` Christophe Leroy 2020-04-18 11:55 ` Eric W. Biederman 2020-04-18 11:55 ` Eric W. Biederman 2020-04-19 8:13 ` Christoph Hellwig 2020-04-19 8:13 ` Christoph Hellwig 2020-04-19 9:46 ` Christophe Leroy 2020-04-19 9:54 ` Christophe Leroy 2020-04-19 8:05 ` Christoph Hellwig 2020-04-19 8:05 ` Christoph Hellwig 2020-04-17 21:09 ` [PATCH 2/2] signal: Remove the set_fs in binfmt_elf.c:fill_siginfo_note Eric W. Biederman 2020-04-17 21:09 ` Eric W. Biederman 2020-04-19 8:03 ` [PATCH 2/8] signal: clean up __copy_siginfo_to_user32 Christoph Hellwig 2020-04-19 8:03 ` Christoph Hellwig 2020-04-14 7:01 ` [PATCH 3/8] signal: replace __copy_siginfo_to_user32 with to_compat_siginfo Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-14 14:00 ` Arnd Bergmann 2020-04-14 14:00 ` Arnd Bergmann 2020-04-14 7:01 ` [PATCH 4/8] binfmt_elf: open code copy_siginfo_to_user to kernelspace buffer Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-14 13:15 ` Arnd Bergmann [this message] 2020-04-14 13:15 ` Arnd Bergmann 2020-04-15 7:45 ` Christoph Hellwig 2020-04-15 7:45 ` Christoph Hellwig 2020-04-15 8:20 ` Arnd Bergmann 2020-04-15 8:20 ` Arnd Bergmann 2020-04-17 13:27 ` Christoph Hellwig 2020-04-17 13:27 ` Christoph Hellwig 2020-04-17 18:10 ` Eric W. Biederman 2020-04-17 18:10 ` Eric W. Biederman 2020-04-17 20:06 ` Arnd Bergmann 2020-04-17 20:06 ` Arnd Bergmann 2020-04-15 3:01 ` Michael Ellerman 2020-04-15 3:01 ` Michael Ellerman 2020-04-15 6:19 ` Christoph Hellwig 2020-04-15 6:19 ` Christoph Hellwig 2020-04-14 7:01 ` [PATCH 5/8] binfmt_elf: remove the set_fs(KERNEL_DS) in elf_core_dump Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-14 7:01 ` [PATCH 6/8] binfmt_elf_fdpic: remove the set_fs(KERNEL_DS) in elf_fdpic_core_dump Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-14 7:01 ` [PATCH 7/8] exec: simplify the copy_strings_kernel calling convention Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-14 7:01 ` [PATCH 8/8] exec: open code copy_string_kernel Christoph Hellwig 2020-04-14 7:01 ` Christoph Hellwig 2020-04-18 8:15 ` Christophe Leroy 2020-04-18 8:15 ` Christophe Leroy 2020-04-19 8:06 ` Christoph Hellwig 2020-04-19 8:06 ` Christoph Hellwig 2020-04-19 9:44 ` Christophe Leroy 2020-04-19 9:44 ` Christophe Leroy 2020-04-17 22:41 ` remove set_fs calls from the exec and coredump code v2 Eric W. Biederman 2020-04-17 22:41 ` Eric W. Biederman 2020-04-19 8:19 ` Christoph Hellwig 2020-04-19 8:19 ` Christoph Hellwig 2020-04-19 11:50 ` Eric W. Biederman 2020-04-19 11:50 ` Eric W. Biederman
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