From: Ian Jackson Date: Fri, 14 Jun 2013 15:39:35 +0000 (+0100) Subject: libelf/xc_dom_load_elf_symtab: Do not use "syms" uninitialised X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~6735 X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https://%22%22/%22http:/www.example.com/cgi/%22https:/%22%22?a=commitdiff_plain;h=95dd49bed681af93f71a401b0a35bf2f917c6e68;p=xen.git libelf/xc_dom_load_elf_symtab: Do not use "syms" uninitialised xc_dom_load_elf_symtab (with load==0) calls elf_round_up, but it mistakenly used the uninitialised variable "syms" when calculating dom->bsd_symtab_start. This should be a reference to "elf". This change might have the effect of rounding the value differently. Previously if the uninitialised value (a single byte on the stack) was ELFCLASS64 (ie, 2), the alignment would be to 8 bytes, otherwise to 4. However, the value is calculated from dom->kernel_seg.vend so this could only make a difference if that value wasn't already aligned to 8 bytes. This is part of the fix to a security issue, XSA-55. Signed-off-by: Ian Jackson Acked-by: Ian Campbell Reviewed-by: Andrew Cooper Reviewed-by: Chuck Anderson v2: Split this change into its own patch for proper review. --- diff --git a/tools/libxc/xc_dom_elfloader.c b/tools/libxc/xc_dom_elfloader.c index bc92302e10..7ff51d1233 100644 --- a/tools/libxc/xc_dom_elfloader.c +++ b/tools/libxc/xc_dom_elfloader.c @@ -142,7 +142,7 @@ static int xc_dom_load_elf_symtab(struct xc_dom_image *dom, hdr = xc_dom_malloc(dom, size); if ( hdr == NULL ) return 0; - dom->bsd_symtab_start = elf_round_up(&syms, dom->kernel_seg.vend); + dom->bsd_symtab_start = elf_round_up(elf, dom->kernel_seg.vend); } memcpy(hdr + sizeof(int),