Aurelien Jarno e4bf6eb4c7 arch/riscv: vdso: remove CFI landing pad from rt_sigreturn ... When CONFIG_RISCV_USER_CFI is enabled, the CFI version of the vDSO, has a CFI landing pad instruction at the start of __vdso_rt_sigreturn. This breaks libgcc's unwinding code which matches on the first two instructions. Other unwinders that rely on similar instruction matching may also be affected. Since __vdso_rt_sigreturn is reached as part of signal-return handling rather than via an indirect call/jump from userspace, it does not need a CFI landing pad. Remove it and restore the instruction sequence expected by existing unwinding code. This matches what was done on arm64 in commit 9a96428557 ("arm64: vdso: Don't prefix sigreturn trampoline with a BTI C instruction") for a similar issue. Cc: stable@vger.kernel.org Fixes: 37f57bd3fa ("arch/riscv: compile vdso with landing pad and shadow stack note") Co-authored-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://patch.msgid.link/20260623204058.498120-1-aurelien@aurel32.net [pjw@kernel.org: fixed comment style] Signed-off-by: Paul Walmsley <pjw@kernel.org>		2026-07-14 19:34:38 -06:00
..
.gitignore	RISC-V: Fix the VDSO symbol generaton for binutils-2.35+	2020-11-06 00:03:48 -08:00
flush_icache.S	arch/riscv: compile vdso with landing pad and shadow stack note	2026-01-29 02:38:40 -07:00
gen_vdso_offsets.sh	arch/riscv: add dual vdso creation logic and select vdso based on hw	2026-01-29 02:38:40 -07:00
getcpu.S	arch/riscv: compile vdso with landing pad and shadow stack note	2026-01-29 02:38:40 -07:00
getrandom.c	RISC-V: vDSO: Wire up getrandom() vDSO implementation	2025-06-05 14:03:09 -07:00
hwprobe.c	riscv: hwprobe: Fix stale vDSO data for late-initialized keys at boot	2025-10-17 22:23:11 -06:00
Makefile	riscv: vdso: Do not use LTO for the vDSO	2026-07-13 12:08:27 -06:00
note.S	riscv: Add build salt to the vDSO	2026-06-25 12:05:05 -06:00
rt_sigreturn.S	arch/riscv: vdso: remove CFI landing pad from rt_sigreturn	2026-07-14 19:34:38 -06:00
sys_hwprobe.S	arch/riscv: compile vdso with landing pad and shadow stack note	2026-01-29 02:38:40 -07:00
vdso.lds.S	riscv: vdso: Exclude .rodata from the PT_DYNAMIC segment	2025-06-10 13:06:48 -07:00
vdso.S	riscv: compat: vdso: Add COMPAT_VDSO base code implementation	2022-04-26 13:36:53 -07:00
vgetrandom-chacha.S	arch/riscv: compile vdso with landing pad and shadow stack note	2026-01-29 02:38:40 -07:00
vgettimeofday.c	arch: vdso: consolidate gettime prototypes	2023-11-23 11:32:32 +01:00