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| author | kib <kib@FreeBSD.org> | 2014-06-30 09:48:44 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2014-06-30 09:48:44 +0000 |
| commit | d02ef38799408e3a6c8914dd8899d6e33a18b99e (patch) | |
| tree | 1cdbf0e90185182bff0bf7d098f7d52a156ffe79 /sys/amd64/amd64/fpu.c | |
| parent | ff62446f9059b50fbd507dbd0d14404a62eb1691 (diff) | |
| download | FreeBSD-src-d02ef38799408e3a6c8914dd8899d6e33a18b99e.zip FreeBSD-src-d02ef38799408e3a6c8914dd8899d6e33a18b99e.tar.gz | |
MFC r267767:
Add FPU_KERN_KTHR flag to fpu_kern_enter(9).
Apply the flag to padlock(4) and aesni(4).
In aesni_cipher_process(), do not leak FPU context state on error.
Diffstat (limited to 'sys/amd64/amd64/fpu.c')
| -rw-r--r-- | sys/amd64/amd64/fpu.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/amd64/amd64/fpu.c b/sys/amd64/amd64/fpu.c index d2d506a..0f4b2b5 100644 --- a/sys/amd64/amd64/fpu.c +++ b/sys/amd64/amd64/fpu.c @@ -890,6 +890,7 @@ static MALLOC_DEFINE(M_FPUKERN_CTX, "fpukern_ctx", "Kernel contexts for FPU state"); #define FPU_KERN_CTX_FPUINITDONE 0x01 +#define FPU_KERN_CTX_DUMMY 0x02 /* avoided save for the kern thread */ struct fpu_kern_ctx { struct savefpu *prev; @@ -933,6 +934,10 @@ fpu_kern_enter(struct thread *td, struct fpu_kern_ctx *ctx, u_int flags) { struct pcb *pcb; + if ((flags & FPU_KERN_KTHR) != 0 && is_fpu_kern_thread(0)) { + ctx->flags = FPU_KERN_CTX_DUMMY; + return (0); + } pcb = td->td_pcb; KASSERT(!PCB_USER_FPU(pcb) || pcb->pcb_save == get_pcb_user_save_pcb(pcb), ("mangled pcb_save")); @@ -952,6 +957,9 @@ fpu_kern_leave(struct thread *td, struct fpu_kern_ctx *ctx) { struct pcb *pcb; + if (is_fpu_kern_thread(0) && (ctx->flags & FPU_KERN_CTX_DUMMY) != 0) + return (0); + KASSERT((ctx->flags & FPU_KERN_CTX_DUMMY) == 0, ("dummy ctx")); pcb = td->td_pcb; critical_enter(); if (curthread == PCPU_GET(fpcurthread)) |
