Kumar Kartikeya Dwivedi e6a908c593 libbpf: Fix skel_internal.h to set errno on loader retval < 0 ... [ Upstream commit e68ac00827 ] When the loader indicates an internal error (result of a checked bpf system call), it returns the result in attr.test.retval. However, tests that rely on ASSERT_OK_PTR on NULL (returned from light skeleton) may miss that NULL denotes an error if errno is set to 0. This would result in skel pointer being NULL, while ASSERT_OK_PTR returning 1, leading to a SEGV on dereference of skel, because libbpf_get_error relies on the assumption that errno is always set in case of error for ptr == NULL. In particular, this was observed for the ksyms_module test. When executed using `./test_progs -t ksyms`, prior tests manipulated errno and the test didn't crash when it failed at ksyms_module load, while using `./test_progs -t ksyms_module` crashed due to errno being untouched. Fixes: 6723474373 (libbpf: Generate loader program out of BPF ELF file.) Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210927145941.1383001-11-memxor@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-11-18 19:16:27 +01:00
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api	tools api fs: Cache cgroupfs mount point	2021-02-17 15:09:08 -03:00
bpf	libbpf: Fix skel_internal.h to set errno on loader retval < 0	2021-11-18 19:16:27 +01:00
lockdep	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
perf	libperf tests: Fix test_stat_cpu	2021-10-14 15:41:35 -03:00
subcmd	libsubcmd: add OPT_UINTEGER_OPTARG option type	2021-08-31 15:44:05 -03:00
symbol	libsymbols kallsyms: Move hex2u64 out of header	2020-05-05 16:35:32 -03:00
traceevent	KVM: x86/mmu: Rename "nxe" role bit to "efer_nx" for macro shenanigans	2021-06-24 18:00:41 -04:00
argv_split.c	tools lib: Move argv_{split,free} from tools/perf/util/	2019-07-01 22:50:40 -03:00
bitmap.c	tools lib: Adopt bitmap_intersects() operation from the kernel sources	2021-06-30 15:28:00 -03:00
ctype.c	tools perf: Move from sane_ctype.h obtained from git to the Linux's original	2019-06-25 21:02:47 -03:00
find_bit.c	tools: sync lib/find_bit implementation	2021-05-06 19:24:12 -07:00
hweight.c
rbtree.c	tools/: replace HTTP links with HTTPS ones	2020-08-07 11:33:21 -07:00
str_error_r.c
string.c	tools lib: Adopt memchr_inv() from kernel	2020-11-27 08:34:52 -03:00
vsprintf.c	perf script: Pad DSO name for --call-trace	2019-05-28 18:37:44 -03:00
zalloc.c	tools lib: Adopt zalloc()/zfree() from tools/perf	2019-07-09 10:13:26 -03:00