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uid_t and gid_t are narrower than VALUE.

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Often uid / gid are 16 bit or 32 bit integers, while VALUE are 32
to 64 bits.  They tend to differ in size.  Because rb_ensure expects
its callbacks to take VALUE arguments, narrowing must be done by
hand, otherwise data corruption can happen depending on machine ABI.
This commit is contained in:
卜部昌平 2019-08-23 12:14:06 +09:00
parent 48131a4673
commit 5e86b005c0
1 changed files with 4 additions and 2 deletions
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6
process.c
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@ -7133,8 +7133,9 @@ p_uid_have_saved_id(void)
#if defined(HAVE_SETRESUID) || defined(HAVE_SETEUID) || defined(_POSIX_SAVED_IDS)
static VALUE
p_uid_sw_ensure(rb_uid_t id)
p_uid_sw_ensure(VALUE i)
{
rb_uid_t id = (rb_uid_t/* narrowing */)i;
under_uid_switch = 0;
id = rb_seteuid_core(id);
return UIDT2NUM(id);
@ -7246,8 +7247,9 @@ p_gid_have_saved_id(void)
#if defined(HAVE_SETRESGID) || defined(HAVE_SETEGID) || defined(_POSIX_SAVED_IDS)
static VALUE
p_gid_sw_ensure(rb_gid_t id)
p_gid_sw_ensure(VALUE i)
{
rb_gid_t id = (rb_gid_t/* narrowing */)i;
under_gid_switch = 0;
id = rb_setegid_core(id);
return GIDT2NUM(id);