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[compiler-rt] making getrandom call blocking. (#78340)

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except when `GRND_NONBLOCK` is present in the flags.
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David CARLIER 2024-01-18 05:46:50 +00:00 committed by GitHub
parent f01b6ca8be
commit d83d1cb89c
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1 changed files with 7 additions and 1 deletions
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8
compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
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@ -9965,7 +9965,13 @@ INTERCEPTOR(void, sl_free, void *sl, int freeall) {
INTERCEPTOR(SSIZE_T, getrandom, void *buf, SIZE_T buflen, unsigned int flags) { INTERCEPTOR(SSIZE_T, getrandom, void *buf, SIZE_T buflen, unsigned int flags) {
void *ctx; void *ctx;
COMMON_INTERCEPTOR_ENTER(ctx, getrandom, buf, buflen, flags); COMMON_INTERCEPTOR_ENTER(ctx, getrandom, buf, buflen, flags);
SSIZE_T n = REAL(getrandom)(buf, buflen, flags); // If GRND_NONBLOCK is set in the flags, it is non blocking.
static const int grnd_nonblock = 1;
SSIZE_T n;
if ((flags & grnd_nonblock))
n = REAL(getrandom)(buf, buflen, flags);
else
n = COMMON_INTERCEPTOR_BLOCK_REAL(getrandom)(buf, buflen, flags);
if (n > 0) { if (n > 0) {
COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, n); COMMON_INTERCEPTOR_WRITE_RANGE(ctx, buf, n);
} }