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Improve set_mcontext:

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o  Don't copy psr verbatim from the user supplied context. Only allow
   userland to change the processor settings that are part of the user
   mask.
This commit is contained in:
Marcel Moolenaar 2003-06-01 23:22:56 +00:00
parent 86f4f6f7b8
commit 0fa2b83829
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=115652
1 changed files with 5 additions and 0 deletions
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5
sys/ia64/ia64/machdep.c
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@ -1023,9 +1023,14 @@ int
set_mcontext(struct thread *td, const mcontext_t *mc)
{
struct trapframe *tf;
uint64_t psr;
tf = td->td_frame;
/* Only copy the user mask from the new context. */
psr = tf->tf_special.psr & ~0x1f;
psr |= mc->mc_special.psr & 0x1f;
tf->tf_special = mc->mc_special;
tf->tf_special.psr = psr;
restore_callee_saved(&mc->mc_preserved);
restore_callee_saved_fp(&mc->mc_preserved_fp);
return (0);