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Fix buffer overflow issue.

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This commit is contained in:
carl 2019-03-25 00:13:42 +08:00
parent dcc2be5e8c
commit a6120c220e
4 changed files with 26 additions and 11 deletions
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7
mach/proto/as/comm4.c
View file

@ -15,7 +15,7 @@
#include "comm0.h" #include "comm0.h"
#include "comm1.h" #include "comm1.h"
#include "y.tab.h" #include "y.tab.h"
#include <object.h> #include "object.h"
extern YYSTYPE yylval; extern YYSTYPE yylval;
@ -243,7 +243,8 @@ archive(void) {
if (needed()) { if (needed()) {
fseek(input,offset,0); fseek(input,offset,0);
archsize = header.ar_size; archsize = header.ar_size;
header.ar_name[14] = '\0'; // TODO: To check if this is correct.
header.ar_name[AR_NAME_MAX-1] = '\0';
parse(remember(header.ar_name)); parse(remember(header.ar_name));
} }
offset += header.ar_size; offset += header.ar_size;
@ -330,7 +331,7 @@ parse(char *s)
*/ */
#ifdef ASLD #ifdef ASLD
for (i = 0; i < H_SIZE; i++) { for (i = 0; i < H_SIZE; i++) {
while (ip = hashtab[H_LOCAL+i]) { while ((ip = hashtab[H_LOCAL+i])) {
/* /*
* cleanup local queue * cleanup local queue
*/ */

10
mach/proto/as/comm5.c
View file

@ -439,7 +439,7 @@ static int innumber(int c)
if (radix != 16 && (c == 'f' || c == 'b')) if (radix != 16 && (c == 'f' || c == 'b'))
return (infbsym(num)); return (infbsym(num));
yylval.y_valu = 0; yylval.y_valu = 0;
while (c = *p++) while ((c = *p++))
{ {
if (c > '9') if (c > '9')
c -= ('a' - '9' - 1); c -= ('a' - '9' - 1);
@ -593,7 +593,7 @@ int hash(const char* p)
int c; int c;
h = 0; h = 0;
while (c = *p++) while ((c = *p++))
{ {
h <<= 2; h <<= 2;
h += c; h += c;
@ -668,10 +668,16 @@ item_t* fb_shift(int lab)
ip = fb_ptr[FB_FORW + lab]; ip = fb_ptr[FB_FORW + lab];
if (ip == 0) if (ip == 0)
{
if (pass == PASS_1) if (pass == PASS_1)
{
ip = fb_alloc(lab); ip = fb_alloc(lab);
}
else else
{
ip = fb_ptr[FB_HEAD + lab]; ip = fb_ptr[FB_HEAD + lab];
}
}
fb_ptr[FB_BACK + lab] = ip; fb_ptr[FB_BACK + lab] = ip;
fb_ptr[FB_FORW + lab] = ip->i_next; fb_ptr[FB_FORW + lab] = ip->i_next;
return (ip); return (ip);

10
mach/proto/as/comm6.c
View file

@ -11,7 +11,7 @@
#include "comm0.h" #include "comm0.h"
#include "comm1.h" #include "comm1.h"
#include "y.tab.h" #include "y.tab.h"
#include <object.h> #include "object.h"
static void new_common(item_t *); static void new_common(item_t *);
@ -187,7 +187,7 @@ switchsect(int newtyp)
{ {
sect_t *sp; sect_t *sp;
if (sp = DOTSCT) if ((sp = DOTSCT))
sp->s_size = DOTVAL - sp->s_base; sp->s_size = DOTVAL - sp->s_base;
if (newtyp == S_UND) { if (newtyp == S_UND) {
DOTSCT = NULL; DOTSCT = NULL;
@ -212,10 +212,16 @@ align(valu_t bytes)
if (bytes == 0) if (bytes == 0)
bytes = ALIGNWORD; bytes = ALIGNWORD;
if (sp->s_lign % bytes) if (sp->s_lign % bytes)
{
if (bytes % sp->s_lign) if (bytes % sp->s_lign)
{
serror("illegal alignment"); serror("illegal alignment");
}
else else
{
sp->s_lign = bytes; sp->s_lign = bytes;
}
}
if (pass == PASS_1) if (pass == PASS_1)
/* /*
* be pessimistic: biggest gap possible * be pessimistic: biggest gap possible

10
mach/proto/as/comm7.c
View file

@ -13,7 +13,7 @@
#include "comm1.h" #include "comm1.h"
#include "y.tab.h" #include "y.tab.h"
#include <stdarg.h> #include <stdarg.h>
#include <object.h> #include "object.h"
valu_t load(const item_t* ip) valu_t load(const item_t* ip)
{ {
@ -77,7 +77,7 @@ char* remember(char* s)
assert(nleft >= 0); assert(nleft >= 0);
} }
p = next; p = next;
while (*p++ = *s++) while ((*p++ = *s++))
; ;
s = next; s = next;
next = p; next = p;
@ -133,7 +133,7 @@ int printx(int ndig, valu_t val)
} while (--n); } while (--n);
do do
{ {
c = "0123456789ABCDEF"[*--p]; c = "0123456789ABCDEF"[(unsigned char)*--p];
putchar(c); putchar(c);
} while (p > buf); } while (p > buf);
return (ndig); return (ndig);
@ -232,6 +232,8 @@ int small(int fitsmall, int gain)
case PASS_3: case PASS_3:
assert(fitsmall || (*p & bit) == 0); assert(fitsmall || (*p & bit) == 0);
return (*p & bit); return (*p & bit);
default:
assert(0);
} }
/*NOTREACHED*/ /*NOTREACHED*/
} }
@ -368,7 +370,7 @@ void emitstr(int zero)
#endif #endif
#define gen1 emit1 #define gen1 emit1
#include <con_float> #include "con_float"
void emitf(int size, int negative) void emitf(int size, int negative)
{ {