Imbus/xv6-riscv-kernel
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fix corner cases in exec of ELF

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put an invalid page below the stack
have fork() handle invalid pages
This commit is contained in:
Robert Morris 2010-08-06 11:12:18 -04:00
parent 1afc9d3fca
commit c4cc10da7e
8 changed files with 84 additions and 37 deletions
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5
kalloc.c
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@ -1,9 +1,8 @@
// Physical memory allocator, intended to allocate
// memory for user processes. Allocates in 4096-byte "pages".
// memory for user processes. Allocates in 4096-byte pages.
// Free list is kept sorted and combines adjacent pages into
// long runs, to make it easier to allocate big segments.
// One reason the page size is 4k is that the x86 segment size
// granularity is 4k.
// This combining is not useful now that xv6 uses paging.
#include "types.h"
#include "defs.h"