From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
xen-devel@lists.xenproject.org, konrad@kernel.org,
ross.lagerwall@citrix.com, mpohlack@amazon.de,
sasha.levin@oracle.com
Cc: Keir Fraser <keir@xen.org>,
Ian Jackson <ian.jackson@eu.citrix.com>,
Jan Beulich <jbeulich@suse.com>, Tim Deegan <tim@xen.org>
Subject: Re: [PATCH v6 08/24] xsplice: Add helper elf routines
Date: Fri, 8 Apr 2016 15:53:44 +0100 [thread overview]
Message-ID: <5707C5F8.2070604@citrix.com> (raw)
In-Reply-To: <1460000983-28170-9-git-send-email-konrad.wilk@oracle.com>
On 07/04/16 04:49, Konrad Rzeszutek Wilk wrote:
> +static int elf_resolve_sections(struct xsplice_elf *elf, const void *data)
> +{
> + struct xsplice_elf_sec *sec;
> + unsigned int i;
> + Elf_Off delta;
> + int rc;
> +
> + /* xsplice_elf_load sanity checked e_shnum. */
> + sec = xmalloc_array(struct xsplice_elf_sec, elf->hdr->e_shnum);
> + if ( !sec )
> + {
> + printk(XENLOG_ERR XSPLICE"%s: Could not allocate memory for section table!\n",
> + elf->name);
> + return -ENOMEM;
> + }
> +
> + elf->sec = sec;
> +
> + delta = elf->hdr->e_shoff + elf->hdr->e_shnum * elf->hdr->e_shentsize;
Have we verified any of these to be sane yet? (i.e. what about
calculation overflow?)
(Edit: e_shnum yes, e_shentsize and e_shoff look to be no)
> + if ( delta >= elf->len )
> + {
> + dprintk(XENLOG_DEBUG, XSPLICE "%s: Section table is past end of payload!\n",
> + elf->name);
> + return -EINVAL;
> + }
(Mis)-alignment
> +static int elf_get_sym(struct xsplice_elf *elf, const void *data)
> +{
> + const struct xsplice_elf_sec *symtab_sec, *strtab_sec;
> + struct xsplice_elf_sym *sym;
> + unsigned int i, delta, offset, nsym;
> +
> + symtab_sec = elf->symtab;
> + strtab_sec = elf->strtab;
> +
> + /* Pointers arithmetic to get file offset. */
> + offset = strtab_sec->data - data;
> +
> + /* Checked already in elf_resolve_sections, but just in case. */
> + ASSERT(offset == strtab_sec->sec->sh_offset);
> + ASSERT(offset < elf->len && (offset + strtab_sec->sec->sh_size <= elf->len));
> +
> + /* symtab_sec->data was computed in elf_resolve_sections. */
> + ASSERT((symtab_sec->sec->sh_offset + data) == symtab_sec->data);
> +
> + /* No need to check values as elf_resolve_sections did it. */
> + nsym = symtab_sec->sec->sh_size / symtab_sec->sec->sh_entsize;
Has anything checked sh_entsize for being 0 or -1 ?
Being unsigned, -1 cant happen, but nothing checks got being nonzero.
With these things fixed, Reviewed-by: Andrew
Cooper<andrew.cooper3@citrix.com>
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next prev parent reply other threads:[~2016-04-08 14:54 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-07 3:49 [PATCH v6] xSplice v1 design and implementation Konrad Rzeszutek Wilk
2016-04-07 3:49 ` [PATCH v6 01/24] xsplice: Design document Konrad Rzeszutek Wilk
2016-04-07 16:34 ` Ian Jackson
2016-04-07 3:49 ` [PATCH v6 02/24] xen/xsplice: Hypervisor implementation of XEN_XSPLICE_op Konrad Rzeszutek Wilk
2016-04-07 14:47 ` Andrew Cooper
2016-04-08 18:30 ` Konrad Rzeszutek Wilk
2016-04-07 3:49 ` [PATCH v6 03/24] libxc: Implementation of XEN_XSPLICE_op in libxc Konrad Rzeszutek Wilk
2016-04-07 19:53 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 04/24] xen-xsplice: Tool to manipulate xsplice payloads Konrad Rzeszutek Wilk
2016-04-07 3:49 ` [PATCH v6 05/24] arm/x86: Use struct virtual_region to do bug, symbol, and (x86) exception tables lookup Konrad Rzeszutek Wilk
2016-04-07 20:12 ` Andrew Cooper
2016-04-08 15:30 ` Julien Grall
2016-04-07 3:49 ` [PATCH v6 06/24] x86: Alter nmi_callback_t typedef Konrad Rzeszutek Wilk
2016-04-07 16:35 ` Ian Jackson
2016-04-07 20:13 ` Andrew Cooper
2016-04-08 20:44 ` Konrad Rzeszutek Wilk
2016-04-07 3:49 ` [PATCH v6 07/24] arm/x86/vmap: Add vmalloc_type and vm_init_type Konrad Rzeszutek Wilk
2016-04-08 14:22 ` Andrew Cooper
2016-04-08 17:19 ` Jan Beulich
2016-04-09 1:10 ` Konrad Rzeszutek Wilk
2016-04-08 15:32 ` Julien Grall
2016-04-07 3:49 ` [PATCH v6 08/24] xsplice: Add helper elf routines Konrad Rzeszutek Wilk
2016-04-07 16:19 ` Ian Jackson
2016-04-07 17:23 ` Jan Beulich
2016-04-07 20:32 ` Andrew Cooper
2016-04-08 13:26 ` Ian Jackson
2016-04-07 20:43 ` Konrad Rzeszutek Wilk
2016-04-08 14:53 ` Andrew Cooper [this message]
2016-04-08 21:26 ` Konrad Rzeszutek Wilk
2016-04-08 22:10 ` Andrew Cooper
2016-04-08 22:48 ` Jan Beulich
2016-04-07 3:49 ` [PATCH v6 09/24] xsplice: Implement payload loading Konrad Rzeszutek Wilk
2016-04-08 15:31 ` Andrew Cooper
2016-04-08 21:10 ` Konrad Rzeszutek Wilk
2016-04-08 21:18 ` Jan Beulich
2016-04-08 22:45 ` Konrad Rzeszutek Wilk
2016-04-08 22:50 ` Jan Beulich
2016-04-09 0:37 ` Konrad Rzeszutek Wilk
2016-04-09 11:48 ` Konrad Rzeszutek Wilk
2016-04-11 15:53 ` Jan Beulich
2016-04-11 16:03 ` Konrad Rzeszutek Wilk
2016-04-11 16:34 ` Konrad Rzeszutek Wilk
2016-04-11 16:55 ` Jan Beulich
2016-04-11 17:08 ` Konrad Rzeszutek Wilk
2016-04-11 17:26 ` Jan Beulich
2016-04-11 18:21 ` Konrad Rzeszutek Wilk
2016-04-11 18:57 ` Konrad Rzeszutek Wilk
2016-04-08 15:35 ` Julien Grall
2016-04-07 3:49 ` [PATCH v6 10/24] xsplice: Implement support for applying/reverting/replacing patches Konrad Rzeszutek Wilk
2016-04-08 15:36 ` Julien Grall
2016-04-08 16:33 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 11/24] x86/xen_hello_world.xsplice: Test payload for patching 'xen_extra_version' Konrad Rzeszutek Wilk
2016-04-08 15:37 ` Julien Grall
2016-04-08 16:38 ` Andrew Cooper
2016-04-09 0:45 ` Konrad Rzeszutek Wilk
2016-04-07 3:49 ` [PATCH v6 12/24] xsplice, symbols: Implement symbol name resolution on address Konrad Rzeszutek Wilk
2016-04-08 16:55 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 13/24] x86, xsplice: Print payload's symbol name and payload name in backtraces Konrad Rzeszutek Wilk
2016-04-08 17:00 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 14/24] xsplice: Add support for bug frames Konrad Rzeszutek Wilk
2016-04-08 17:03 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 15/24] xsplice: Add support for exception tables Konrad Rzeszutek Wilk
2016-04-08 17:16 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 16/24] xsplice: Add support for alternatives Konrad Rzeszutek Wilk
2016-04-08 17:34 ` Andrew Cooper
2016-04-08 17:57 ` Jan Beulich
2016-04-07 3:49 ` [PATCH v6 17/24] build_id: Provide ld-embedded build-ids Konrad Rzeszutek Wilk
2016-04-08 15:39 ` Julien Grall
2016-04-08 18:07 ` Andrew Cooper
2016-04-08 19:34 ` Konrad Rzeszutek Wilk
2016-04-07 3:49 ` [PATCH v6 18/24] HYPERCALL_version_op: Add VERSION_build_id to retrieve build-id Konrad Rzeszutek Wilk
2016-04-08 18:07 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 19/24] libxl: info: Display build_id of the hypervisor using XEN_VERSION_build_id Konrad Rzeszutek Wilk
2016-04-07 3:49 ` [PATCH v6 20/24] xsplice: Print build_id in keyhandler and on bootup Konrad Rzeszutek Wilk
2016-04-08 18:12 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 21/24] xsplice: Stacking build-id dependency checking Konrad Rzeszutek Wilk
2016-04-08 18:19 ` Andrew Cooper
2016-04-09 1:43 ` Konrad Rzeszutek Wilk
2016-04-07 3:49 ` [PATCH v6 22/24] xsplice/xen_replace_world: Test-case for XSPLICE_ACTION_REPLACE Konrad Rzeszutek Wilk
2016-04-08 18:20 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 23/24] xsplice: Prevent duplicate payloads from being loaded Konrad Rzeszutek Wilk
2016-04-07 16:36 ` Ian Jackson
2016-04-08 18:21 ` Andrew Cooper
2016-04-07 3:49 ` [PATCH v6 24/24] MAINTAINERS/xsplice: Add myself and Ross as the maintainers Konrad Rzeszutek Wilk
2016-04-08 18:21 ` Andrew Cooper
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