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Use unsigned comparisons. Prior to this commit, SHA1_Update and

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RIPEMD160_Update were broken when all of the following conditions
applied:
(1) The platform is i386.
(2) The program calling *_Update is statically linked to libmd.
(3) The buffer provided to *_Update is aligned modulo 4 bytes.
(4) The buffer extends beyond 2GB.

Due to the design of this code, SHA1_Update and RIPEMD160_Update will
still be broken if conditions (1)-(3) apply AND the buffer extends
beyond 4GB (i.e., there is an integer overflow in computing "data + len").
Since this remaining bug simply replaces SIGSEGV with a bogus hash (and
non-broken programs should never provide such operands) I don't consider
it to be a serious problem.

MFC After:      1 week
PR:             kern/102795
This commit is contained in:
Colin Percival 2007-05-14 05:00:37 +00:00
parent c6507e5ed7
commit 23f6784297
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=169547
2 changed files with 4 additions and 2 deletions
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3
lib/libmd/i386/rmd160.S
View File

@ -1,3 +1,4 @@
/* $FreeBSD$ */
/* Run the C pre-processor over this file with one of the following defined /* Run the C pre-processor over this file with one of the following defined
* ELF - elf object files, * ELF - elf object files,
* OUT - a.out object files, * OUT - a.out object files,
@ -2005,7 +2006,7 @@ ripemd160_block_x86:
movl 112(%esp), %esi movl 112(%esp), %esi
cmpl %esi, %edi cmpl %esi, %edi
movl 108(%esp), %edi movl 108(%esp), %edi
jge .L000start jae .L000start
addl $88, %esp addl $88, %esp
popl %ebx popl %ebx
popl %ebp popl %ebp

3
lib/libmd/i386/sha.S
View File

@ -1,3 +1,4 @@
/* $FreeBSD$ */
/* -*- Fundamental -*- Emacs' assembler mode hoses this file */ /* -*- Fundamental -*- Emacs' assembler mode hoses this file */
#ifndef PIC #ifndef PIC
/* Run the C pre-processor over this file with one of the following defined /* Run the C pre-processor over this file with one of the following defined
@ -1935,7 +1936,7 @@ sha1_block_x86:
movl %edi, 16(%ebp) movl %edi, 16(%ebp)
cmpl %esi, %eax cmpl %esi, %eax
movl %ebx, 4(%ebp) movl %ebx, 4(%ebp)
jl .L001end jb .L001end
movl (%esi), %eax movl (%esi), %eax
jmp .L000start jmp .L000start
.L001end: .L001end: