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kernel: limit syscallfmt user strings to 64K (as in validname)

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This commit is contained in:
cinap_lenrek 2015-08-06 11:42:05 +02:00
parent 86eb8ea6bb
commit 9585e9b7f8
1 changed files with 5 additions and 2 deletions
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7
sys/src/9/port/syscallfmt.c
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@ -36,15 +36,18 @@ fmtrwdata(Fmt* f, char* a, int n, char* suffix)
static void static void
fmtuserstring(Fmt* f, char* a, char* suffix) fmtuserstring(Fmt* f, char* a, char* suffix)
{ {
char *t, *e;
int n; int n;
char *t;
if(a == nil){ if(a == nil){
fmtprint(f, "0/\"\"%s", suffix); fmtprint(f, "0/\"\"%s", suffix);
return; return;
} }
validaddr((uintptr)a, 1, 0); validaddr((uintptr)a, 1, 0);
n = ((char*)vmemchr(a, 0, ~0) - a) + 1; n = 1<<16;
e = vmemchr(a, 0, n);
if(e != nil)
n = e - a;
t = smalloc(n+1); t = smalloc(n+1);
memmove(t, a, n); memmove(t, a, n);
t[n] = 0; t[n] = 0;