kernel/linux.git/arch/riscv/include, branch v6.12.95

riscv: kfence: Call mark_new_valid_map() for kfence_unprotect()

2026-07-04T11:43:35+00:00

commit 8d6c8c40e733b3fcaf92fed0a078bba2f6941a3b upstream. In kfence_protect_page(), which kfence_unprotect() calls, we cannot send IPIs to other CPUs to ask them to flush TLB. This may lead to those CPUs spuriously faulting on a recently allocated kfence object despite it being valid, leading to false positive use-after-free reports. Fix this by calling mark_new_valid_map() so that the page fault handling code path notices the spurious fault and flushes TLB then retries the access. Update the comment in handle_exception to indicate that new_valid_map_cpus_check also handles kfence_unprotect() spurious faults. Note that kfence_protect() has the same stale TLB entries problem, but that leads to false negatives, which is fine with kfence. Cc: stable@vger.kernel.org Reported-by: Yanko Kaneti Fixes: b3431a8bb336 ("riscv: Fix IPIs usage in kfence_protect_page()") Signed-off-by: Vivian Wang Link: https://patch.msgid.link/20260303-handle-kfence-protect-spurious-fault-v2-2-f80d8354d79d@iscas.ac.cn Signed-off-by: Paul Walmsley Signed-off-by: Greg Kroah-Hartman

riscv: mm: Extract helper mark_new_valid_map()

2026-07-04T11:43:35+00:00

commit 9ee25d0a70ff4494b4e1d266b962d0a574ef318a upstream. In preparation of a future patch using the same mechanism for non-vmalloc addresses, extract the mark_new_valid_map() helper from flush_cache_vmap(). No functional change intended. Cc: stable@vger.kernel.org Signed-off-by: Vivian Wang Link: https://patch.msgid.link/20260303-handle-kfence-protect-spurious-fault-v2-1-f80d8354d79d@iscas.ac.cn Signed-off-by: Paul Walmsley Signed-off-by: Greg Kroah-Hartman

ring-buffer: Flush and stop persistent ring buffer on panic

2026-06-09T10:26:03+00:00

[ Upstream commit a494d3c8d5392bcdff83c2a593df0c160ff9f322 ] On real hardware, panic and machine reboot may not flush hardware cache to memory. This means the persistent ring buffer, which relies on a coherent state of memory, may not have its events written to the buffer and they may be lost. Moreover, there may be inconsistency with the counters which are used for validation of the integrity of the persistent ring buffer which may cause all data to be discarded. To avoid this issue, stop recording of the ring buffer on panic and flush the cache of the ring buffer's memory. Fixes: e645535a954a ("tracing: Add option to use memmapped memory for trace boot instance") Cc: stable@vger.kernel.org Cc: Will Deacon Cc: Mathieu Desnoyers Cc: Ian Rogers Link: https://patch.msgid.link/177751969602.2136606.12031934362587643488.stgit@mhiramat.tok.corp.google.com Signed-off-by: Masami Hiramatsu (Google) Acked-by: Catalin Marinas Acked-by: Geert Uytterhoeven Signed-off-by: Steven Rostedt Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

Disable -Wattribute-alias for clang-23 and newer

2026-06-09T10:25:51+00:00

commit 175db11786bde9061db526bf1ac5107d915f5163 upstream. Clang recently added support for -Wattribute-alias [1], which results in the same warnings that necessitated commit bee20031772a ("disable -Wattribute-alias warning for SYSCALL_DEFINEx()") for GCC. kernel/time/itimer.c:325:1: error: alias and aliasee have different types 'long (unsigned int)' and 'long (typeof (__builtin_choose_expr((__builtin_types_compatible_p(typeof ((unsigned int)0), typeof (0LL)) || __builtin_types_compatible_p(typeof ((unsigned int)0), typeof (0ULL))), 0LL, 0L)))' (aka 'long (long)') [-Werror,-Wattribute-alias] 325 | SYSCALL_DEFINE1(alarm, unsigned int, seconds) | ^ include/linux/syscalls.h:225:36: note: expanded from macro 'SYSCALL_DEFINE1' 225 | #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__) | ^ include/linux/syscalls.h:236:2: note: expanded from macro 'SYSCALL_DEFINEx' 236 | __SYSCALL_DEFINEx(x, sname, __VA_ARGS__) | ^ include/linux/syscalls.h:251:18: note: expanded from macro '__SYSCALL_DEFINEx' 251 | __attribute__((alias(__stringify(__se_sys##name)))); \ | ^ kernel/time/itimer.c:325:1: note: aliasee is declared here include/linux/syscalls.h:225:36: note: expanded from macro 'SYSCALL_DEFINE1' 225 | #define SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, _##name, __VA_ARGS__) | ^ include/linux/syscalls.h:236:2: note: expanded from macro 'SYSCALL_DEFINEx' 236 | __SYSCALL_DEFINEx(x, sname, __VA_ARGS__) | ^ include/linux/syscalls.h:255:18: note: expanded from macro '__SYSCALL_DEFINEx' 255 | asmlinkage long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \ | ^ :16:1: note: expanded from here 16 | __se_sys_alarm | ^ Disable the warnings in the same way for clang-23 and newer. Disable the warning about unknown warning options to avoid breaking the build for versions of clang-23 that do not have -Wattribute-alias, such as ones deployed by vendors like Android or CI systems or when bisecting LLVM between llvmorg-23-init and release/23.x. Cc: stable@vger.kernel.org Closes: https://github.com/ClangBuiltLinux/linux/issues/2163 Link: https://github.com/llvm/llvm-project/commit/40da6920a0d71d49dfa2392b09153600b0759f5e [1] Link: https://patch.msgid.link/20260515-syscall-disable-attribute-alias-for-clang-v1-1-9a9d95d41df6@kernel.org Signed-off-by: Nathan Chancellor Signed-off-by: Greg Kroah-Hartman

tracing: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs

2026-03-04T12:19:37+00:00

[ Upstream commit b9b55c8912ce1e5555715d126486bdd63ddfeaec ] Add ftrace_partial_regs() which converts the ftrace_regs to pt_regs. This is for the eBPF which needs this to keep the same pt_regs interface to access registers. Thus when replacing the pt_regs with ftrace_regs in fprobes (which is used by kprobe_multi eBPF event), this will be used. If the architecture defines its own ftrace_regs, this copies partial registers to pt_regs and returns it. If not, ftrace_regs is the same as pt_regs and ftrace_partial_regs() will return ftrace_regs::regs. Signed-off-by: Masami Hiramatsu (Google) Acked-by: Florent Revest Cc: Alexei Starovoitov Cc: Martin KaFai Lau Cc: bpf Cc: Alexei Starovoitov Cc: Jiri Olsa Cc: Alan Maguire Cc: Mark Rutland Cc: Catalin Marinas Cc: Will Deacon Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Link: https://lore.kernel.org/173518996761.391279.4987911298206448122.stgit@devnote2 Signed-off-by: Steven Rostedt (Google) Stable-dep-of: aea251799998 ("x86/fgraph,bpf: Switch kprobe_multi program stack unwind to hw_regs path") Signed-off-by: Sasha Levin

fgraph: Replace fgraph_ret_regs with ftrace_regs

2026-03-04T12:19:36+00:00

[ Upstream commit a3ed4157b7d89800a0008de0c9e46a438a5c3745 ] Use ftrace_regs instead of fgraph_ret_regs for tracing return value on function_graph tracer because of simplifying the callback interface. The CONFIG_HAVE_FUNCTION_GRAPH_RETVAL is also replaced by CONFIG_HAVE_FUNCTION_GRAPH_FREGS. Signed-off-by: Masami Hiramatsu (Google) Acked-by: Heiko Carstens Acked-by: Will Deacon Cc: Catalin Marinas Cc: Alexei Starovoitov Cc: Florent Revest Cc: Martin KaFai Lau Cc: bpf Cc: Alexei Starovoitov Cc: Jiri Olsa Cc: Alan Maguire Cc: Mark Rutland Cc: Huacai Chen Cc: WANG Xuerui Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: Heiko Carstens Cc: Christian Borntraeger Cc: Sven Schnelle Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" Cc: Mathieu Desnoyers Link: https://lore.kernel.org/173518991508.391279.16635322774382197642.stgit@devnote2 Signed-off-by: Steven Rostedt (Google) Stable-dep-of: aea251799998 ("x86/fgraph,bpf: Switch kprobe_multi program stack unwind to hw_regs path") Signed-off-by: Sasha Levin

ftrace: Consolidate ftrace_regs accessor functions for archs using pt_regs

2026-03-04T12:19:36+00:00

[ Upstream commit e4cf33ca48128d580e25ebe779b7ba7b4b4cf733 ] Most architectures use pt_regs within ftrace_regs making a lot of the accessor functions just calls to the pt_regs internally. Instead of duplication this effort, use a HAVE_ARCH_FTRACE_REGS for architectures that have their own ftrace_regs that is not based on pt_regs and will define all the accessor functions, and for the architectures that just use pt_regs, it will leave it undefined, and the default accessor functions will be used. Note, this will also make it easier to add new accessor functions to ftrace_regs as it will mean having to touch less architectures. Cc: Cc: "x86@kernel.org" Cc: Mathieu Desnoyers Cc: Mark Rutland Cc: Will Deacon Cc: Huacai Chen Cc: WANG Xuerui Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Naveen N Rao Cc: Madhavan Srinivasan Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: Christian Borntraeger Cc: Sven Schnelle Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Link: https://lore.kernel.org/20241010202114.2289f6fd@gandalf.local.home Acked-by: Masami Hiramatsu (Google) Acked-by: Heiko Carstens # s390 Acked-by: Catalin Marinas Acked-by: Michael Ellerman # powerpc Suggested-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) Stable-dep-of: aea251799998 ("x86/fgraph,bpf: Switch kprobe_multi program stack unwind to hw_regs path") Signed-off-by: Sasha Levin

ftrace: Make ftrace_regs abstract from direct use

2026-03-04T12:19:36+00:00

[ Upstream commit 7888af4166d4ab07ba51234be6ba332b7807e901 ] ftrace_regs was created to hold registers that store information to save function parameters, return value and stack. Since it is a subset of pt_regs, it should only be used by its accessor functions. But because pt_regs can easily be taken from ftrace_regs (on most archs), it is tempting to use it directly. But when running on other architectures, it may fail to build or worse, build but crash the kernel! Instead, make struct ftrace_regs an empty structure and have the architectures define __arch_ftrace_regs and all the accessor functions will typecast to it to get to the actual fields. This will help avoid usage of ftrace_regs directly. Link: https://lore.kernel.org/all/20241007171027.629bdafd@gandalf.local.home/ Cc: "linux-arch@vger.kernel.org" Cc: "x86@kernel.org" Cc: Mathieu Desnoyers Cc: Mark Rutland Cc: Will Deacon Cc: Huacai Chen Cc: WANG Xuerui Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Naveen N Rao Cc: Madhavan Srinivasan Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: Christian Borntraeger Cc: Sven Schnelle Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Link: https://lore.kernel.org/20241008230628.958778821@goodmis.org Acked-by: Catalin Marinas Signed-off-by: Steven Rostedt (Google) Acked-by: Masami Hiramatsu (Google) Acked-by: Heiko Carstens # s390 Signed-off-by: Steven Rostedt (Google) Stable-dep-of: aea251799998 ("x86/fgraph,bpf: Switch kprobe_multi program stack unwind to hw_regs path") Signed-off-by: Sasha Levin

riscv: compat: fix COMPAT_UTS_MACHINE definition

2026-02-06T15:55:44+00:00

commit 0ea05c4f7527a98f5946f96c829733788934311d upstream. The COMPAT_UTS_MACHINE for riscv was incorrectly defined as "riscv". Change it to "riscv32" to reflect the correct 32-bit compat name. Fixes: 06d0e3723647 ("riscv: compat: Add basic compat data type implementation") Cc: stable@vger.kernel.org Signed-off-by: Han Gao Reviewed-by: Guo Ren (Alibaba Damo Academy) Link: https://patch.msgid.link/20260127190711.2264664-1-gaohan@iscas.ac.cn Signed-off-by: Paul Walmsley Signed-off-by: Greg Kroah-Hartman

riscv: pgtable: Cleanup useless VA_USER_XXX definitions

2026-01-17T15:31:24+00:00

[ Upstream commit 5e5be092ffadcab0093464ccd9e30f0c5cce16b9 ] These marcos are not used after commit b5b4287accd7 ("riscv: mm: Use hint address in mmap if available"). Cleanup VA_USER_XXX definitions in asm/pgtable.h. Fixes: b5b4287accd7 ("riscv: mm: Use hint address in mmap if available") Signed-off-by: Guo Ren (Alibaba DAMO Academy) Reviewed-by: Jinjie Ruan Link: https://patch.msgid.link/20251201005850.702569-1-guoren@kernel.org Signed-off-by: Paul Walmsley Signed-off-by: Sasha Levin