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linux/arch/riscv
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Sergey Matyukevich d451a01c5a riscv: vector: init vector context with proper vlenb 
[ Upstream commit ef3ff40346 ]

The vstate in thread_struct is zeroed when the vector context is
initialized. That includes read-only register vlenb, which holds
the vector register length in bytes. Zeroed state persists until
mstatus.VS becomes 'dirty' and a context switch saves the actual
hardware values.

This can expose the zero vlenb value to the user-space in early
debug scenarios, e.g. when ptrace attaches to a traced process
early, before any vector instruction except the first one was
executed.

Fix this by specifying proper vlenb on vector context init.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Reviewed-by: Andy Chiu <andybnac@gmail.com>
Tested-by: Andy Chiu <andybnac@gmail.com>
Link: https://patch.msgid.link/20251214163537.1054292-3-geomatsi@gmail.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:20:29 -05:00
..
boot riscv: boot: Always make Image from vmlinux, not vmlinux.unstripped 2026-01-17 16:35:12 +01:00
configs RISC-V updates for the v6.18 merge window (part two) 2025-10-04 10:36:22 -07:00
crypto lib/crypto: riscv: Depend on RISCV_EFFICIENT_VECTOR_UNALIGNED_ACCESS 2026-01-02 12:57:29 +01:00
errata riscv: errata: Fix the PAUSE Opcode for MIPS P8700 2025-09-19 10:33:56 -06:00
include riscv: Add intermediate cast to 'unsigned long' in __get_user_asm 2026-02-11 13:42:01 +01:00
kernel riscv: vector: init vector context with proper vlenb 2026-03-04 07:20:29 -05:00
kvm RISC-V: KVM: Fix guest page fault within HLV* instructions 2025-12-18 14:03:12 +01:00
lib Crypto library updates for 6.17 2025-07-28 17:58:52 -07:00
mm riscv: ptdump: use seq_puts() in pt_dump_seq_puts() macro 2025-10-27 11:40:43 -06:00
net bpf-next-6.18 2025-09-30 17:58:11 -07:00
purgatory kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI 2025-09-24 14:29:14 -07:00
tools riscv: Stop considering R_RISCV_NONE as bad relocations 2025-07-16 08:13:55 -07:00
Kbuild riscv: migrate to the generic rule for built-in DTB 2025-03-18 13:30:13 +00:00
Kconfig riscv: Fix CONFIG_AS_HAS_INSN for new .insn usage 2025-11-07 17:39:07 -07:00
Kconfig.debug riscv: Add tests for riscv module loading 2023-11-07 14:59:32 -08:00
Kconfig.errata riscv: errata: Fix the PAUSE Opcode for MIPS P8700 2025-09-19 10:33:56 -06:00
Kconfig.socs riscv: Add Kconfig option for ESWIN platforms 2025-09-25 08:29:05 +02:00
Kconfig.vendor riscv: Add xmipsexectl as a vendor extension 2025-09-18 20:36:00 -06:00
Makefile riscv: Remove redundant judgment for the default build target 2025-11-07 17:39:07 -07:00
Makefile.postlink kbuild: Create intermediate vmlinux build with relocations preserved 2025-03-17 00:29:50 +09:00