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MFamd64: r266901

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Allocate a zeroed LDT.

Failing to do this might result in the LDT appearing to run out of free
descriptors because of random junk in the descriptor's 'sd_type' field.

http://lists.freebsd.org/pipermail/freebsd-amd64/2014-May/016088.html

PR:		212639
Submitted by:	wheelcomplex@gmail.com
MFC after:	2 weeks
This commit is contained in:
tijl 2016-09-25 18:29:02 +00:00
parent 76a97eb0c4
commit 3f32edbd77
1 changed files with 1 additions and 1 deletions
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2
sys/i386/i386/sys_machdep.c
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@ -438,7 +438,7 @@ user_ldt_alloc(struct mdproc *mdp, int len)
new_ldt->ldt_len = len = NEW_MAX_LD(len);
new_ldt->ldt_base = (caddr_t)kmem_malloc(kernel_arena,
len * sizeof(union descriptor), M_WAITOK);
len * sizeof(union descriptor), M_WAITOK | M_ZERO);
new_ldt->ldt_refcnt = 1;
new_ldt->ldt_active = 0;