From 22531d8cc58f390986e7070eca5d1628aa7b2fe0 Mon Sep 17 00:00:00 2001 From: Vivian Wang Date: Tue, 23 Jul 2024 18:05:44 +0800 Subject: util/getauxval: Ensure setting errno if not found Sometimes zero is a valid value for getauxval (e.g. AT_EXECFD). Make sure that we can distinguish between a valid zero value and a not found entry by setting errno. Assumes that getauxval from sys/auxv.h sets errno correctly. Signed-off-by: Vivian Wang Message-ID: <20240723100545.405476-2-uwu@dram.page> Signed-off-by: Richard Henderson --- util/getauxval.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'util/getauxval.c') diff --git a/util/getauxval.c b/util/getauxval.c index b124107d61..ad4f6686a8 100644 --- a/util/getauxval.c +++ b/util/getauxval.c @@ -95,6 +95,7 @@ unsigned long qemu_getauxval(unsigned long type) } } + errno = ENOENT; return 0; } @@ -104,7 +105,10 @@ unsigned long qemu_getauxval(unsigned long type) unsigned long qemu_getauxval(unsigned long type) { unsigned long aux = 0; - elf_aux_info(type, &aux, sizeof(aux)); + int ret = elf_aux_info(type, &aux, sizeof(aux)); + if (ret != 0) { + errno = ret; + } return aux; } @@ -112,6 +116,7 @@ unsigned long qemu_getauxval(unsigned long type) unsigned long qemu_getauxval(unsigned long type) { + errno = ENOSYS; return 0; } -- cgit v1.2.3