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runtime: don't assume AT_RANDOM provide 4-byte aligned ptr

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R=dave, remyoudompheng
CC=golang-dev
https://golang.org/cl/6854056
This commit is contained in:
Shenghou Ma 2012-11-18 02:47:17 +08:00
parent 80dcc434a8
commit d1e06dab7c
1 changed files with 8 additions and 3 deletions
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11
src/pkg/runtime/signal_linux_arm.c
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@ -173,11 +173,14 @@ runtime·checkgoarm(void)
void
runtime·setup_auxv(int32 argc, void *argv_list)
{
byte **argv = &argv_list;
byte **argv;
byte **envp;
byte *rnd;
uint32 *auxv;
uint32 t;
argv = &argv_list;
// skip envp to get to ELF auxiliary vector.
for(envp = &argv[argc+1]; *envp != nil; envp++)
;
@ -186,8 +189,10 @@ runtime·setup_auxv(int32 argc, void *argv_list)
for(auxv=(uint32*)envp; auxv[0] != AT_NULL; auxv += 2) {
switch(auxv[0]) {
case AT_RANDOM: // kernel provided 16-byte worth of random data
if(auxv[1])
runtime·randomNumber = *(uint32*)(auxv[1] + 4);
if(auxv[1]) {
rnd = (byte*)auxv[1];
runtime·randomNumber = rnd[4] | rnd[5]<<8 | rnd[6]<<16 | rnd[7]<<24;
}
break;
case AT_PLATFORM: // v5l, v6l, v7l
if(auxv[1]) {