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| author | H. Peter Anvin <hpa@zytor.com> | 2009-02-16 21:02:23 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-02-16 21:04:59 -0800 |
| commit | f4cbcf6081b27dd2fff04c68717cd5ac7a214df7 (patch) | |
| tree | f5df56badd80c1cbbcceeb5c5152fd93a415c0d3 | |
| parent | 51f563a2e52d1e2668e7b7a3d480c4f1e4b89d97 (diff) | |
| download | syslinux-elf-f4cbcf6081b27dd2fff04c68717cd5ac7a214df7.tar.gz syslinux-elf-f4cbcf6081b27dd2fff04c68717cd5ac7a214df7.tar.xz syslinux-elf-f4cbcf6081b27dd2fff04c68717cd5ac7a214df7.zip | |
pxelinux: Minimum size for PXENV+ is 0x28 bytes
The minimum size for the PXENV+ structure is 0x28 bytes (for PXE
1.x/2.0); the size will be 0x2C if the !PXE pointer is provided.
| -rw-r--r-- | core/pxelinux.asm | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/core/pxelinux.asm b/core/pxelinux.asm index 4dfa7af6..e23c3dd9 100644 --- a/core/pxelinux.asm +++ b/core/pxelinux.asm @@ -392,6 +392,8 @@ have_pxenv: cmp ax,0201h ; API version 2.1 or higher jb old_api + cmp byte [es:bx+8],2Ch ; Space for !PXE pointer? + jb old_api mov si,bx mov ax,es les bx,[es:bx+28h] ; !PXE structure pointer @@ -1020,6 +1022,7 @@ is_struc: cmp word [es:bx+4],'V+' jne .bad movzx cx,[es:bx+8] + cmp cx,28h jb .bad .checksum: mov si,bx |