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add some bounds checking to openprog()

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for some absurd reason (none), there was no bounds check anywhere preceding the memmove of prog into mem.
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Yuvia 2025-09-07 21:06:35 +00:00
parent 6c07508a33
commit a252b33fb5
1 changed files with 2 additions and 0 deletions
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scemu.c
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@ -43,6 +43,8 @@ openprog(char *f, vlong *progsiz)
if(fd < 0) if(fd < 0)
return; return;
d = dirfstat(fd); d = dirfstat(fd);
if(d->length > 32768)
sysfatal("bad program: bigger than 32K, please shrink it");
*progsiz = d->length; *progsiz = d->length;
free(d); free(d);
prog = malloc(*progsiz); prog = malloc(*progsiz);