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It's not entirely obvious that PGEX_I must be zero if no-execute is neither

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supported nor enabled.  Just to be sure, verify that no-execute is enabled
before passing VM_PROT_EXECUTE to vm_fault().

Suggested by: tegge@
This commit is contained in:
Alan Cox 2006-08-14 06:15:16 +00:00
parent 1e6fdb7e32
commit 3173042ecc
1 changed files with 2 additions and 2 deletions
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4
sys/amd64/amd64/trap.c
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@ -568,11 +568,11 @@ trap_pfault(frame, usermode)
/*
* PGEX_I is defined only if the execute disable bit capability is
* supported and enabled; otherwise, that bit is reserved, i.e., zero.
* supported and enabled.
*/
if (frame->tf_err & PGEX_W)
ftype = VM_PROT_WRITE;
else if (frame->tf_err & PGEX_I)
else if ((frame->tf_err & PGEX_I) && pg_nx != 0)
ftype = VM_PROT_EXECUTE;
else
ftype = VM_PROT_READ;