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Don't leave garbage in parts of fpregs in the fxsr case. All callers

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(procfs and ptrace) supply kernel stack garbage, so kernel context was
leaked to userland.

Reviewed by:	des
This commit is contained in:
Bruce Evans 2002-02-16 07:07:54 +00:00
parent a21759a1a9
commit e9196dc5f7
2 changed files with 4 additions and 0 deletions
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2
sys/amd64/amd64/machdep.c
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@ -2018,6 +2018,8 @@ fill_fpregs_xmm(sv_xmm, sv_87)
register struct envxmm *penv_xmm = &sv_xmm->sv_env;
int i;
bzero(sv_87, sizeof(*sv_87));
/* FPU control/status */
penv_87->en_cw = penv_xmm->en_cw;
penv_87->en_sw = penv_xmm->en_sw;

2
sys/i386/i386/machdep.c
View file

@ -2018,6 +2018,8 @@ fill_fpregs_xmm(sv_xmm, sv_87)
register struct envxmm *penv_xmm = &sv_xmm->sv_env;
int i;
bzero(sv_87, sizeof(*sv_87));
/* FPU control/status */
penv_87->en_cw = penv_xmm->en_cw;
penv_87->en_sw = penv_xmm->en_sw;