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Change amd64_get_ldt() to return 'EOF' when the LDT is not yet

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allocated, when requested range of descriptors does not fit into
currently allocated LDT, or trim the return if the range fits
partially.  Before, the function returned EINVAL.

Reviewed by:	bde
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
kib 2017-10-09 16:20:39 +00:00
parent 8844e99855
commit 8bde9fde3b
1 changed files with 5 additions and 5 deletions
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10
sys/amd64/amd64/sys_machdep.c
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@ -556,12 +556,12 @@ amd64_get_ldt(struct thread *td, struct i386_ldt_args *uap)
uap->start, uap->num, (void *)uap->descs);
#endif
if (uap->start >= max_ldt_segment)
return (EINVAL);
num = min(uap->num, max_ldt_segment - uap->start);
pldt = td->td_proc->p_md.md_ldt;
if (pldt == NULL)
return (EINVAL);
if (pldt == NULL || uap->start >= max_ldt_segment || uap->num == 0) {
td->td_retval[0] = 0;
return (0);
}
num = min(uap->num, max_ldt_segment - uap->start);
lp = &((struct user_segment_descriptor *)(pldt->ldt_base))[uap->start];
data = malloc(num * sizeof(struct user_segment_descriptor), M_TEMP,
M_WAITOK);