From: "Jan Beulich" <JBeulich@suse.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Keir Fraser <keir@xen.org>,
ross.lagerwall@citrix.com, andrew.cooper3@citrix.com,
mpohlack@amazon.de, sasha.levin@oracle.com,
xen-devel@lists.xenproject.org
Subject: Re: [PATCH v9 24/27] xsplice: Stacking build-id dependency checking.
Date: Wed, 27 Apr 2016 03:27:27 -0600 [thread overview]
Message-ID: <5720A21F02000078000E63C9@prv-mh.provo.novell.com> (raw)
In-Reply-To: <1461598514-5440-25-git-send-email-konrad.wilk@oracle.com>
>>> On 25.04.16 at 17:35, <konrad.wilk@oracle.com> wrote:
> @@ -25,7 +28,7 @@ clean::
> .PHONY: config.h
> config.h: OLD_CODE_SZ=$(call CODE_SZ,$(BASEDIR)/xen-syms,xen_extra_version)
> config.h: NEW_CODE_SZ=$(call CODE_SZ,$<,xen_hello_world)
> -config.h: xen_hello_world_func.o
> +config.h: xen_hello_world_func.o xen_bye_world_func.o
Why is that?
> @@ -33,9 +36,43 @@ config.h: xen_hello_world_func.o
> xen_hello_world.o: xen_hello_world_func.o
>
> .PHONY: $(XSPLICE)
> -$(XSPLICE): config.h xen_hello_world_func.o xen_hello_world.o
> - $(LD) $(LDFLAGS) -r -o $(XSPLICE) xen_hello_world_func.o \
> - xen_hello_world.o
> +$(XSPLICE): config.h xen_hello_world_func.o xen_hello_world.o note.o
> + $(LD) $(LDFLAGS) $(build_id_linker) -r -o $(XSPLICE) \
> + xen_hello_world_func.o xen_hello_world.o note.o
Probably easier to read and maintain if you used $(filter %.o,$^)
here?
> +xen_bye_world.o: xen_bye_world_func.o
Again - why?
> +.PHONY: $(XSPLICE_BYE)
> +$(XSPLICE_BYE): $(XSPLICE) config.h xen_bye_world_func.o xen_bye_world.o hello_world_note.o
The object files depend on config.h, but the binary does only
indirectly via the object files I would guess. (This, just like the
question right above, would then apply to the $(XSPLICE) related
rules too, in an earlier patch.)
> + $(LD) $(LDFLAGS) $(build_id_linker) -r -o $(XSPLICE_BYE) \
> + xen_bye_world_func.o xen_bye_world.o hello_world_note.o
Same as above - better use $^ (and if config.h goes away as a
direct dependency, it looks like you don't even need $(filter ...)).
> +int xen_build_id_check(const Elf_Note *n, unsigned int n_sz,
> + const void **p, unsigned int *len)
> +{
> + /* Check if we really have a build-id. */
> + if ( NT_GNU_BUILD_ID != n->type )
> + return -ENODATA;
> +
> + if ( n_sz <= sizeof(*n) )
> + return -EINVAL;
> +
> + if ( n->namesz + n->descsz > UINT_MAX )
Afaict this is always false. I think you really want
if ( n->namesz + n->descsz < n->namesz )
> + return -EINVAL;
> +
> + if ( n->namesz != 4 /* GNU\0 */)
< 4 would suffice here (and be more flexible if odd padding gets
inserted by whatever generates the note)
> + return -EINVAL;
> +
> + if ( n->namesz + n->descsz + sizeof(*n) > n_sz )
if ( n->namesz + n->descsz > n_sz - sizeof(*n) )
> @@ -98,18 +130,9 @@ static int __init xen_build_init(void)
> if ( &n[1] > __note_gnu_build_id_end )
> return -ENODATA;;
>
> - /* Check if we really have a build-id. */
> - if ( NT_GNU_BUILD_ID != n->type )
> - return -ENODATA;
> + sz = (size_t)__note_gnu_build_id_end - (size_t)n;
So let's hope sizeof(void *) == sizeof(size_t) (or else this would yield
compiler warnings).
Jan
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next prev parent reply other threads:[~2016-04-27 9:27 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-25 15:34 [PATCH 9] xSplice v1 design and implementation Konrad Rzeszutek Wilk
2016-04-25 15:34 ` [PATCH v9 01/27] Revert "libxc/libxl/python/xenstat/ocaml: Use new XEN_VERSION hypercall" Konrad Rzeszutek Wilk
2016-04-25 15:48 ` Jan Beulich
2016-04-25 15:53 ` Wei Liu
2016-04-25 15:34 ` [PATCH v9 02/27] Revert "HYPERCALL_version_op. New hypercall mirroring XENVER_ but sane." Konrad Rzeszutek Wilk
2016-04-25 15:34 ` [PATCH v9 03/27] xsplice: Design document Konrad Rzeszutek Wilk
2016-04-25 15:34 ` [PATCH v9 04/27] xen/xsplice: Hypervisor implementation of XEN_XSPLICE_op Konrad Rzeszutek Wilk
2016-04-26 7:48 ` Ross Lagerwall
2016-04-26 7:52 ` Ross Lagerwall
2016-04-26 10:21 ` Jan Beulich
2016-04-26 17:50 ` Konrad Rzeszutek Wilk
2016-04-27 6:51 ` Jan Beulich
2016-04-27 13:47 ` Konrad Rzeszutek Wilk
2016-04-27 14:11 ` Jan Beulich
2016-04-25 15:34 ` [PATCH v9 05/27] libxc: Implementation of XEN_XSPLICE_op in libxc Konrad Rzeszutek Wilk
2016-04-26 7:51 ` Ross Lagerwall
2016-04-25 15:34 ` [PATCH v9 06/27] xen-xsplice: Tool to manipulate xsplice payloads Konrad Rzeszutek Wilk
2016-04-26 7:49 ` Ross Lagerwall
2016-04-25 15:34 ` [PATCH v9 07/27] arm/x86: Use struct virtual_region to do bug, symbol, and (x86) exception tables lookup Konrad Rzeszutek Wilk
2016-04-26 10:31 ` Jan Beulich
2016-04-25 15:34 ` [PATCH v9 08/27] arm/x86/vmap: Add v[z|m]alloc_xen and vm_init_type Konrad Rzeszutek Wilk
2016-04-26 10:47 ` Jan Beulich
2016-04-27 2:38 ` Konrad Rzeszutek Wilk
2016-04-27 7:12 ` Jan Beulich
2016-04-27 13:46 ` Konrad Rzeszutek Wilk
2016-04-27 14:15 ` Jan Beulich
2016-04-25 15:34 ` [PATCH v9 09/27] x86/mm: Introduce modify_xen_mappings() Konrad Rzeszutek Wilk
2016-04-25 15:34 ` [PATCH v9 10/27] xsplice: Add helper elf routines Konrad Rzeszutek Wilk
2016-04-26 10:05 ` Ross Lagerwall
2016-04-26 11:52 ` Jan Beulich
2016-04-26 12:37 ` Jan Beulich
2016-04-27 1:59 ` Konrad Rzeszutek Wilk
2016-04-27 7:27 ` Jan Beulich
2016-04-27 14:00 ` Konrad Rzeszutek Wilk
2016-04-27 4:06 ` Konrad Rzeszutek Wilk
2016-04-27 7:52 ` Jan Beulich
2016-04-27 18:45 ` Konrad Rzeszutek Wilk
2016-04-25 15:34 ` [PATCH v9 11/27] xsplice: Implement payload loading Konrad Rzeszutek Wilk
2016-04-26 10:48 ` Ross Lagerwall
2016-04-26 13:39 ` Jan Beulich
2016-04-27 1:47 ` Konrad Rzeszutek Wilk
2016-04-27 7:57 ` Jan Beulich
2016-04-27 3:28 ` Konrad Rzeszutek Wilk
2016-04-27 8:28 ` Jan Beulich
2016-04-27 15:48 ` Konrad Rzeszutek Wilk
2016-04-27 16:06 ` Jan Beulich
2016-04-27 16:14 ` Jan Beulich
2016-04-27 18:40 ` Konrad Rzeszutek Wilk
2016-04-25 15:34 ` [PATCH v9 12/27] xsplice: Implement support for applying/reverting/replacing patches Konrad Rzeszutek Wilk
2016-04-26 15:21 ` Jan Beulich
2016-04-27 3:39 ` Konrad Rzeszutek Wilk
2016-04-27 8:36 ` Jan Beulich
2016-05-11 9:51 ` Martin Pohlack
2016-05-11 13:56 ` Konrad Rzeszutek Wilk
2016-04-25 15:35 ` [PATCH v9 13/27] x86/xen_hello_world.xsplice: Test payload for patching 'xen_extra_version' Konrad Rzeszutek Wilk
2016-04-26 15:31 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 14/27] xsplice, symbols: Implement symbol name resolution on address Konrad Rzeszutek Wilk
2016-04-26 15:48 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 15/27] xsplice, symbols: Implement fast symbol names -> virtual addresses lookup Konrad Rzeszutek Wilk
2016-04-26 15:53 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 16/27] x86, xsplice: Print payload's symbol name and payload name in backtraces Konrad Rzeszutek Wilk
2016-04-26 11:06 ` Ross Lagerwall
2016-04-26 12:41 ` Jan Beulich
2016-04-26 12:48 ` Ross Lagerwall
2016-04-26 13:41 ` Jan Beulich
2016-04-27 3:31 ` Konrad Rzeszutek Wilk
2016-04-27 8:37 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 17/27] xsplice: Add support for bug frames Konrad Rzeszutek Wilk
2016-04-26 11:05 ` Ross Lagerwall
2016-04-26 13:08 ` Ross Lagerwall
2016-04-26 15:58 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 18/27] xsplice: Add support for exception tables Konrad Rzeszutek Wilk
2016-04-26 16:01 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 19/27] xsplice: Add support for alternatives Konrad Rzeszutek Wilk
2016-04-27 8:58 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 20/27] build_id: Provide ld-embedded build-ids Konrad Rzeszutek Wilk
2016-04-25 15:35 ` [PATCH v9 21/27] xsplice: Print build_id in keyhandler and on bootup Konrad Rzeszutek Wilk
2016-04-25 15:35 ` [PATCH v9 22/27] XENVER_build_id/libxc: Provide ld-embedded build-id Konrad Rzeszutek Wilk
2016-04-25 15:35 ` [PATCH v9 23/27] libxl: info: Display build_id of the hypervisor Konrad Rzeszutek Wilk
2016-04-25 15:35 ` [PATCH v9 24/27] xsplice: Stacking build-id dependency checking Konrad Rzeszutek Wilk
2016-04-27 9:27 ` Jan Beulich [this message]
2016-04-27 16:36 ` Konrad Rzeszutek Wilk
2016-04-28 9:47 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 25/27] xsplice/xen_replace_world: Test-case for XSPLICE_ACTION_REPLACE Konrad Rzeszutek Wilk
2016-04-25 15:35 ` [PATCH v9 26/27] xsplice: Prevent duplicate payloads from being loaded Konrad Rzeszutek Wilk
2016-04-27 9:31 ` Jan Beulich
2016-04-25 15:35 ` [PATCH v9 27/27] MAINTAINERS/xsplice: Add myself and Ross as the maintainers Konrad Rzeszutek Wilk
2016-04-25 15:41 ` [PATCH 9] xSplice v1 design and implementation Jan Beulich
2016-04-25 15:47 ` Konrad Rzeszutek Wilk
2016-04-25 15:54 ` Jan Beulich
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