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refactor(eval): use uv_random() for init_srand() (#29575)

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N/A patches for version.c:
vim-patch:9.1.0518: initialize the random buffer can be improved
vim-patch:9.1.0531: resource leak in mch_get_random()
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zeertzjq 2024-07-05 18:39:06 +08:00 committed by GitHub
parent 9217e0d671
commit 3c53e8f785
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1 changed files with 12 additions and 34 deletions
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36
src/nvim/eval/funcs.c
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@ -5883,42 +5883,20 @@ static void f_py3eval(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
static void init_srand(uint32_t *const x)
FUNC_ATTR_NONNULL_ALL
{
#ifndef MSWIN
static int dev_urandom_state = NOTDONE; // FAIL or OK once tried
if (dev_urandom_state != FAIL) {
const int fd = os_open("/dev/urandom", O_RDONLY, 0);
struct {
union {
uint32_t number;
char bytes[sizeof(uint32_t)];
} contents;
uint8_t bytes[sizeof(uint32_t)];
} buf;
// Attempt reading /dev/urandom.
if (fd == -1) {
dev_urandom_state = FAIL;
} else {
buf.contents.number = 0;
if (read(fd, buf.contents.bytes, sizeof(uint32_t)) != sizeof(uint32_t)) {
dev_urandom_state = FAIL;
} else {
dev_urandom_state = OK;
*x = buf.contents.number;
if (uv_random(NULL, NULL, buf.bytes, sizeof(buf.bytes), 0, NULL) == 0) {
*x = buf.number;
return;
}
os_close(fd);
}
}
if (dev_urandom_state != OK) {
// Reading /dev/urandom doesn't work, fall back to os_hrtime() XOR with process ID
#endif
// uncrustify:off
// The system's random number generator doesn't work,
// fall back to os_hrtime() XOR with process ID
*x = (uint32_t)os_hrtime();
*x ^= (uint32_t)os_get_pid();
#ifndef MSWIN
}
#endif
// uncrustify:on
}
static inline uint32_t splitmix32(uint32_t *const x)