diff options
| author | Denys Vlasenko <vda.linux@googlemail.com> | 2025-10-08 14:49:26 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2025-10-08 14:49:26 +0200 |
| commit | 3621595939e43a831d66f6b757d4f410029bff95 (patch) | |
| tree | cb2ee155787618ce12a4a029c31ae3987a885439 /libbb/xfuncs_printf.c | |
| parent | a0017a5b5038b3f803ece9140099410c8d4ed4b1 (diff) | |
nsenter,unshare: don't use xvfork_parent_waits_and_exits(), it SEGVs on ppc64le
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/xfuncs_printf.c')
| -rw-r--r-- | libbb/xfuncs_printf.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c index 842d10cd2..d413c81e8 100644 --- a/libbb/xfuncs_printf.c +++ b/libbb/xfuncs_printf.c @@ -696,6 +696,14 @@ pid_t FAST_FUNC xfork(void) } #endif +#if 0 +/* DO NOT DO THIS. This can't be a function. + * It works on some arches (x86) but fails on others (ppc64le: SEGV). + * The reason is: the child returns from this function + * and likely pops up the stack in an arch-dependent way. + * When child eventually exits or execs, parent "reappear" + * in the now-unwound stack (!) and the behavior is undefined. + */ void FAST_FUNC xvfork_parent_waits_and_exits(void) { pid_t pid; @@ -711,6 +719,7 @@ void FAST_FUNC xvfork_parent_waits_and_exits(void) } /* Child continues */ } +#endif // Useful when we do know that pid is valid, and we just want to wait // for it to exit. Not existing pid is fatal. waitpid() status is not returned. |