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* sysdeps/i386/memchr.S: Check high bound against 

chars actually scanned. 
* sysdeps/i386/memcmp.S: Likewise. 
* sysdeps/i386/stpncpy.S: Adjust high-bound check to 
account for pointers that lie one beyond end-of-buffer.
This commit is contained in:
Greg McGary 2000-08-25 21:09:43 +00:00
parent ad7534c8f0
commit 53c065086b
3 changed files with 9 additions and 6 deletions
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3
sysdeps/i386/memchr.S
View File

@ -53,7 +53,7 @@ ENTRY (BP_SYM (__memchr))
movl STR(%esp), %eax /* str: pointer to memory block. */
movl CHR(%esp), %edx /* c: byte we are looking for. */
movl LEN(%esp), %esi /* len: length of memory block. */
CHECK_BOUNDS_BOTH_WIDE (%eax, STR(%esp), %esi)
CHECK_BOUNDS_LOW (%eax, STR(%esp))
/* If my must not test more than three characters test
them one by one. This is especially true for 0. */
@ -314,6 +314,7 @@ L(8): testb %cl, %cl /* test first byte in dword */
/* No further test needed we we know it is one of the four bytes. */
L(9):
#if __BOUNDED_POINTERS__
CHECK_BOUNDS_HIGH (%eax, STR(%esp), jb)
/* If RTN pointer is phony, don't copy return value into it. */
movl RTN(%esp), %ecx
testl %ecx, %ecx

8
sysdeps/i386/memcmp.S
View File

@ -38,8 +38,8 @@ ENTRY (BP_SYM (memcmp))
movl BLK1(%esp), %esi
movl BLK2(%esp), %edi
movl LEN(%esp), %ecx
CHECK_BOUNDS_BOTH_WIDE (%esi, BLK1(%esp), %ecx)
CHECK_BOUNDS_BOTH_WIDE (%edi, BLK2(%esp), %ecx)
CHECK_BOUNDS_LOW (%esi, BLK1(%esp))
CHECK_BOUNDS_LOW (%edi, BLK2(%esp))
cld /* Set direction of comparison. */
@ -62,7 +62,9 @@ ENTRY (BP_SYM (memcmp))
Note that the following operation does not change 0xffffffff. */
orb $1, %al /* Change 0 to 1. */
L(1): popl %esi /* Restore registers. */
L(1): CHECK_BOUNDS_HIGH (%esi, BLK1(%esp), jbe)
CHECK_BOUNDS_HIGH (%edi, BLK2(%esp), jbe)
popl %esi /* Restore registers. */
movl %edx, %edi
LEAVE

4
sysdeps/i386/stpncpy.S
View File

@ -143,8 +143,8 @@ L(3): decl %ecx /* all bytes written? */
L(9):
#if __BOUNDED_POINTERS__
addl %eax, %esi /* undo magic: %esi now points beyond end of SRC */
CHECK_BOUNDS_HIGH (%esi, SRC(%esp), jb)
CHECK_BOUNDS_HIGH (%eax, DEST(%esp), jb)
CHECK_BOUNDS_HIGH (%esi, SRC(%esp), jbe)
CHECK_BOUNDS_HIGH (%eax, DEST(%esp), jbe)
RETURN_BOUNDED_POINTER (DEST(%esp))
#endif
popl %esi /* restore saved register content */