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Use glibc's getrandom() instead of syscall when glibc > 2.25.
Fixes #3432 Signed-off-by: okhowang(王沛文) <okhowang@tencent.com>
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ChangeLog.d/getrandom.txt
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2
ChangeLog.d/getrandom.txt
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@ -0,0 +1,2 @@
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Changes
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Use glibc's getrandom() instead of syscall when glibc > 2.25.
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@ -18,9 +18,15 @@
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*/
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#if defined(__linux__)
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#if !defined(_GNU_SOURCE)
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/* Ensure that syscall() is available even when compiling with -std=c99 */
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#define _GNU_SOURCE
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#endif
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#include <features.h>
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#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25)
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#define HAVE_SYS_RANDOM 1
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#endif
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#endif
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#include "common.h"
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@ -86,10 +92,16 @@ int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len
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/*
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* Test for Linux getrandom() support.
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* Since there is no wrapper in the libc yet, use the generic syscall wrapper
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* When the C library is GNU libc and its version is greater than 2.25,
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* include sys/random.h to use getrandom(),
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* otherwise use the generic use the generic syscall wrapper
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* available in GNU libc and compatible libc's (eg uClibc).
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*/
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#if ((defined(__linux__) && defined(__GLIBC__)) || defined(__midipix__))
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#if HAVE_SYS_RANDOM
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#include <sys/random.h>
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#include <errno.h>
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#define HAVE_GETRANDOM
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#elif (defined(__linux__) && defined(__GLIBC__)) || defined(__midipix__)
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#include <unistd.h>
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#include <sys/syscall.h>
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#if defined(SYS_getrandom)
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@ -155,7 +167,11 @@ int mbedtls_platform_entropy_poll( void *data,
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((void) data);
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#if defined(HAVE_GETRANDOM)
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#if HAVE_SYS_RANDOM
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ret = getrandom(output, len, 0);
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#else
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ret = getrandom_wrapper( output, len, 0 );
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#endif
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if( ret >= 0 )
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{
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*olen = ret;
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