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arm64: Correctly align the SVE signal context

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The SVE signal context needs to be correctly aligned. Fix this by
creating a new macro to calculate the needed size to provide this
alignment, and use it when setting and checking the saved SVE signal
context.

Approved by:	so
Security:	FreeBSD-EN-26:02.arm64
Reported by:	cperciva
Reviewed by:	cperciva, markj
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D54396

(cherry picked from commit a9e77eb7016df70723c208fc09fbd01ec23a732d)
(cherry picked from commit bcd6bb8067d13d28d13a309e32818cda9e0d29ff)
This commit is contained in:
Andrew Turner 2026-01-06 10:35:55 +00:00 committed by Franco Fichtner
parent 98ad277551
commit 0eb74ff005
1 changed files with 9 additions and 5 deletions
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14
sys/arm64/arm64/exec_machdep.c
View file

@ -60,6 +60,10 @@
#include <machine/vfp.h>
#endif
#define CTX_SIZE_SVE(buf_size) \
roundup2(sizeof(struct sve_context) + (buf_size), \
_Alignof(struct sve_context))
_Static_assert(sizeof(mcontext_t) == 880, "mcontext_t size incorrect");
_Static_assert(sizeof(ucontext_t) == 960, "ucontext_t size incorrect");
_Static_assert(sizeof(siginfo_t) == 80, "siginfo_t size incorrect");
@ -545,8 +549,7 @@ set_mcontext(struct thread *td, mcontext_t *mcp)
buf_size = sve_buf_size(td);
/* Check the size is valid */
if (ctx.ctx_size !=
(sizeof(sve_ctx) + buf_size))
if (ctx.ctx_size != CTX_SIZE_SVE(buf_size))
return (EINVAL);
memset(pcb->pcb_svesaved, 0,
@ -689,7 +692,7 @@ sendsig_ctx_sve(struct thread *td, vm_offset_t *addrp)
{
struct sve_context ctx;
struct pcb *pcb;
size_t buf_size;
size_t buf_size, ctx_size;
vm_offset_t ctx_addr;
pcb = td->td_pcb;
@ -700,14 +703,15 @@ sendsig_ctx_sve(struct thread *td, vm_offset_t *addrp)
MPASS(pcb->pcb_svesaved != NULL);
buf_size = sve_buf_size(td);
ctx_size = CTX_SIZE_SVE(buf_size);
/* Address for the full context */
*addrp -= sizeof(ctx) + buf_size;
*addrp -= ctx_size;
ctx_addr = *addrp;
memset(&ctx, 0, sizeof(ctx));
ctx.sve_ctx.ctx_id = ARM64_CTX_SVE;
ctx.sve_ctx.ctx_size = sizeof(ctx) + buf_size;
ctx.sve_ctx.ctx_size = ctx_size;
ctx.sve_vector_len = pcb->pcb_sve_len;
ctx.sve_flags = 0;