diff options
| -rw-r--r-- | Misc/NEWS | 3 | ||||
| -rw-r--r-- | Python/random.c | 15 |
2 files changed, 11 insertions, 7 deletions
@@ -10,6 +10,9 @@ Release date: TBA Core and Builtins ----------------- +- Issue #27955: Fallback on reading /dev/urandom device when the getrandom() + syscall fails with EPERM, for example when blocked by SECCOMP. + - Issue #28131: Fix a regression in zipimport's compile_source(). zipimport should use the same optimization level as the interpreter. diff --git a/Python/random.c b/Python/random.c index 5582e39..f2ada5f 100644 --- a/Python/random.c +++ b/Python/random.c @@ -121,8 +121,8 @@ py_getentropy(unsigned char *buffer, Py_ssize_t size, int fatal) /* Call getrandom() - Return 1 on success - - Return 0 if getrandom() syscall is not available (failed with ENOSYS) - or if getrandom(GRND_NONBLOCK) failed with EAGAIN (system urandom + - Return 0 if getrandom() syscall is not available (failed with ENOSYS or + EPERM) or if getrandom(GRND_NONBLOCK) failed with EAGAIN (system urandom not initialized yet) and raise=0. - Raise an exception (if raise is non-zero) and return -1 on error: getrandom() failed with EINTR and the Python signal handler raised an @@ -131,7 +131,7 @@ static int py_getrandom(void *buffer, Py_ssize_t size, int raise) { /* Is getrandom() supported by the running kernel? Set to 0 if getrandom() - failed with ENOSYS. Need Linux kernel 3.17 or newer, or Solaris + failed with ENOSYS or EPERM. Need Linux kernel 3.17 or newer, or Solaris 11.3 or newer */ static int getrandom_works = 1; @@ -182,8 +182,9 @@ py_getrandom(void *buffer, Py_ssize_t size, int raise) if (n < 0) { /* ENOSYS: getrandom() syscall not supported by the kernel (but - * maybe supported by the host which built Python). */ - if (errno == ENOSYS) { + * maybe supported by the host which built Python). EPERM: + * getrandom() syscall blocked by SECCOMP or something else. */ + if (errno == ENOSYS || errno == EPERM) { getrandom_works = 0; return 0; } @@ -250,7 +251,7 @@ dev_urandom_noraise(unsigned char *buffer, Py_ssize_t size) if (py_getrandom(buffer, size, 0) == 1) { return; } - /* getrandom() failed with ENOSYS, + /* getrandom() failed with ENOSYS or EPERM, fall back on reading /dev/urandom */ #endif @@ -301,7 +302,7 @@ dev_urandom_python(char *buffer, Py_ssize_t size) if (res == 1) { return 0; } - /* getrandom() failed with ENOSYS, + /* getrandom() failed with ENOSYS or EPERM, fall back on reading /dev/urandom */ #endif |