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support for AT_RANDOM auxiliary entry on the process stack (needed for _dl_random in glibc)

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Balazs Gerofi
2014-11-10 18:30:27 +09:00
committed by Balazs Gerofi bgerofi@riken.jp
parent ac8e2a0c40
commit 89acf5c5d6
2 changed files with 13 additions and 2 deletions
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2
kernel/include/process.h
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@ -212,7 +212,7 @@ struct user
unsigned long int u_debugreg [8];
};
#define AUXV_LEN 14
#define AUXV_LEN 16
struct vm_range {
struct list_head list;

13
kernel/process.c
View File

@ -1445,6 +1445,7 @@ int init_process_stack(struct process *process, struct program_load_desc *pn,
int error;
unsigned long *p;
unsigned long minsz;
unsigned long at_rand;
/* create stack range */
minsz = PAGE_SIZE;
@ -1487,6 +1488,12 @@ int init_process_stack(struct process *process, struct program_load_desc *pn,
/* set up initial stack frame */
p = (unsigned long *)(stack + minsz);
s_ind = -1;
/* "random" 16 bytes on the very top */
p[s_ind--] = 0x010101011;
p[s_ind--] = 0x010101011;
at_rand = end + sizeof(unsigned long) * s_ind;
/* auxiliary vector */
/* If you add/delete entires, please increase/decrease
AUXV_LEN in include/process.h. */
@ -1504,10 +1511,14 @@ int init_process_stack(struct process *process, struct program_load_desc *pn,
p[s_ind--] = AT_PAGESZ;
p[s_ind--] = pn->at_clktck; /* AT_CLKTCK */
p[s_ind--] = AT_CLKTCK;
p[s_ind--] = at_rand; /* AT_RANDOM */
p[s_ind--] = AT_RANDOM;
/* Save auxiliary vector for later use. */
memcpy(process->saved_auxv, &p[s_ind + 1],
sizeof(process->saved_auxv));
p[s_ind--] = 0; /* envp terminating NULL */
p[s_ind--] = 0; /* envp terminating NULL */
/* envp */
for (arg_ind = envc - 1; arg_ind > -1; --arg_ind) {
p[s_ind--] = (unsigned long)env[arg_ind];