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runtime: remove paranoid mapping at 0

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Too many programs complain that we even try.
This was a bit of security paranoia and not worth
the bother.

Fixes #1340.

R=r, r2
CC=golang-dev
https://golang.org/cl/3579042
This commit is contained in:
Russ Cox 2010-12-13 16:57:35 -05:00
parent 2ef09148a0
commit 951318c0df
3 changed files with 0 additions and 21 deletions
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7
src/pkg/runtime/darwin/mem.c
View File

@ -36,11 +36,4 @@ runtime·SysFree(void *v, uintptr n)
void
runtime·SysMemInit(void)
{
// Code generators assume that references to addresses
// on the first page will fault. Map the page explicitly with
// no permissions, to head off possible bugs like the system
// allocating that page as the virtual address space fills.
// Ignore any error, since other systems might be smart
// enough to never allow anything there.
// mmap(nil, 4096, PROT_NONE, MAP_FIXED|MAP_ANON|MAP_PRIVATE, -1, 0);
}

7
src/pkg/runtime/freebsd/mem.c
View File

@ -36,11 +36,4 @@ runtime·SysFree(void *v, uintptr n)
void
runtime·SysMemInit(void)
{
// Code generators assume that references to addresses
// on the first page will fault. Map the page explicitly with
// no permissions, to head off possible bugs like the system
// allocating that page as the virtual address space fills.
// Ignore any error, since other systems might be smart
// enough to never allow anything there.
runtime·mmap(nil, 4096, PROT_NONE, MAP_FIXED|MAP_ANON|MAP_PRIVATE, -1, 0);
}

7
src/pkg/runtime/linux/mem.c
View File

@ -40,11 +40,4 @@ runtime·SysFree(void *v, uintptr n)
void
runtime·SysMemInit(void)
{
// Code generators assume that references to addresses
// on the first page will fault. Map the page explicitly with
// no permissions, to head off possible bugs like the system
// allocating that page as the virtual address space fills.
// Ignore any error, since other systems might be smart
// enough to never allow anything there.
runtime·mmap(nil, 4096, PROT_NONE, MAP_FIXED|MAP_ANON|MAP_PRIVATE, -1, 0);
}