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Peter Anvin" , Namhyung Kim , Andrii Nakryiko , Kees Cook , Sam James Subject: [RFC PATCH v1 11/25] unwind_user/eh_frame: Wire up unwind_user to eh_frame Date: Tue, 18 Aug 2026 16:49:40 +0200 Message-ID: <20260818144954.2320378-12-jremus@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260818144954.2320378-1-jremus@linux.ibm.com> References: <20260818144954.2320378-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDEwNyBTYWx0ZWRfX3/UlmZ9W/JP2 WGOeycrYno+H6Fn9R8o1qkq0fuLakg8wCKQ0qU+pX/5F3QEtejPjHMEbrsk1YbTEVUgZMj8yBiV Eu6PHhDjBh9fZoGn5dn5rv4m9//smvHe2UMqG1lqoCXbZvpz6zAg75As29FEtqYvonccxoLK0WP R6ZENaYDivZ1Dm5HAMltsRhiJjfh2j5dGFXx8m6R8Ae4c7QOeEBEiai2OJ1VWCSdNnxr0c9ehtk ILOucnXmFy/blQWVu8AIFeRQh4DDRqDNmSOtKnbm7iy7W1cjxClaPvsYXC2j6BVTv6eXqVlR0pM d2lhnLuPYrWOfSvJGu40U/cbgFDqF+hh+M1FAinCZ8ZPu/nwk2aESkFmkv5e8V8t7mQDCtSHi6l DUgqTAbdhVpqTRo7xk6SkZ0+2J6uA2KdrsXC6sPWmBMHY17h0bsJ5E5G3YSIeI29cWZvU4GVN5o R/p71GY5G4oWlm9kD9g== X-Proofpoint-ORIG-GUID: Fch2np3my5BmMhd0tXmvBuHiLI03faCE X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDEwNyBTYWx0ZWRfX6qE0HRT1DzMA L3Qd4uFlIPQcgNd5r4FBR0uakga+/GhAPL4Tt1vOW4XJ9wN4l2aba9sgMbQxp1lxcxaegCCNeDb YVXwXA0/UYyZu3wOVKufXvwQEBylrcA= X-Authority-Analysis: v=2.4 cv=DJe/JSNb c=1 sm=1 tr=0 ts=6a84711e cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=Z71hq_FPCwn_qcrh8uAA:9 X-Proofpoint-GUID: at7WDyMuZ4lCw5N8_ZjgdbBJHfwDgA8t X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-18_02,2026-08-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 spamscore=0 clxscore=1015 bulkscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180107 Now that the eh_frame infrastructure is fully in place, make it work by hooking it up to the unwind_user interface. Based on Josh Poimboeuf's, Steven Rostedt's, and my unwind user sframe implementation. Signed-off-by: Jens Remus --- arch/Kconfig | 1 + include/linux/unwind_user_types.h | 4 +++- kernel/unwind/user.c | 23 +++++++++++++++++++++++ 3 files changed, 27 insertions(+), 1 deletion(-) diff --git a/arch/Kconfig b/arch/Kconfig index 60542d5e5731..ea969811f798 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -488,6 +488,7 @@ config UNWIND_USER config HAVE_UNWIND_USER_EH_FRAME bool + select UNWIND_USER config HAVE_UNWIND_USER_FP bool diff --git a/include/linux/unwind_user_types.h b/include/linux/unwind_user_types.h index 4da058096259..88fc2fee8534 100644 --- a/include/linux/unwind_user_types.h +++ b/include/linux/unwind_user_types.h @@ -9,7 +9,8 @@ * available. */ enum unwind_user_type_bits { - UNWIND_USER_TYPE_FP_BIT = 0, + UNWIND_USER_TYPE_EH_FRAME_BIT = 0, + UNWIND_USER_TYPE_FP_BIT = 1, NR_UNWIND_USER_TYPE_BITS, }; @@ -17,6 +18,7 @@ enum unwind_user_type_bits { enum unwind_user_type { /* Type "none" for the start of stack walk iteration. */ UNWIND_USER_TYPE_NONE = 0, + UNWIND_USER_TYPE_EH_FRAME = BIT(UNWIND_USER_TYPE_EH_FRAME_BIT), UNWIND_USER_TYPE_FP = BIT(UNWIND_USER_TYPE_FP_BIT), }; diff --git a/kernel/unwind/user.c b/kernel/unwind/user.c index 830c620fe453..85fc82252af1 100644 --- a/kernel/unwind/user.c +++ b/kernel/unwind/user.c @@ -10,6 +10,7 @@ #include #include #include +#include #ifdef CONFIG_DYNAMIC_DEBUG @@ -173,6 +174,16 @@ static int unwind_user_next_fp(struct unwind_user_state *state) return unwind_user_next_common(state, &fp_frame); } +static int unwind_user_next_eh_frame(struct unwind_user_state *state) +{ + struct unwind_user_frame frame; + + /* eh_frame expects the frame to be local storage */ + if (eh_frame_find(state->ip, &frame)) + return -ENOENT; + return unwind_user_next_common(state, &frame); +} + static int unwind_user_next(struct unwind_user_state *state) { unsigned long iter_mask = state->available_types; @@ -186,6 +197,16 @@ static int unwind_user_next(struct unwind_user_state *state) state->current_type = type; switch (type) { + case UNWIND_USER_TYPE_EH_FRAME: + switch (unwind_user_next_eh_frame(state)) { + case 0: + return 0; + case -ENOENT: + continue; /* Try next method. */ + default: + state->done = true; + } + break; case UNWIND_USER_TYPE_FP: if (!unwind_user_next_fp(state)) return 0; @@ -214,6 +235,8 @@ static int unwind_user_start(struct unwind_user_state *state) return -EINVAL; } + if (current_has_eh_frame()) + state->available_types |= UNWIND_USER_TYPE_EH_FRAME; if (IS_ENABLED(CONFIG_HAVE_UNWIND_USER_FP)) state->available_types |= UNWIND_USER_TYPE_FP; -- 2.53.0