+ arm64-patching-fix-handling-of-execmem-addresses.patch added to mm-hotfixes-unstable branch

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The patch titled
     Subject: arm64: patching: fix handling of execmem addresses
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     arm64-patching-fix-handling-of-execmem-addresses.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-patching-fix-handling-of-execmem-addresses.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Will Deacon <will@xxxxxxxxxx>
Subject: arm64: patching: fix handling of execmem addresses
Date: Wed, 22 May 2024 00:38:13 +0300

Klara Modin reported warnings for a kernel configured with BPF_JIT but
without MODULES:

[   44.131296] Trying to vfree() bad address (000000004a17c299)
[   44.138024] WARNING: CPU: 1 PID: 193 at mm/vmalloc.c:3189 remove_vm_area (mm/vmalloc.c:3189 (discriminator 1))
[   44.146675] CPU: 1 PID: 193 Comm: kworker/1:2 Tainted: G      D W          6.9.0-01786-g2c9e5d4a0082 #25
[   44.158229] Hardware name: Raspberry Pi 3 Model B (DT)
[   44.164433] Workqueue: events bpf_prog_free_deferred
[   44.170492] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[   44.178601] pc : remove_vm_area (mm/vmalloc.c:3189 (discriminator 1))
[   44.183705] lr : remove_vm_area (mm/vmalloc.c:3189 (discriminator 1))
[   44.188772] sp : ffff800082a13c70
[   44.193112] x29: ffff800082a13c70 x28: 0000000000000000 x27: 0000000000000000
[   44.201384] x26: 0000000000000000 x25: ffff00003a44efa0 x24: 00000000d4202000
[   44.209658] x23: ffff800081223dd0 x22: ffff00003a198a40 x21: ffff8000814dd880
[   44.217924] x20: 00000000d4202000 x19: ffff8000814dd880 x18: 0000000000000006
[   44.226206] x17: 0000000000000000 x16: 0000000000000020 x15: 0000000000000002
[   44.234460] x14: ffff8000811a6370 x13: 0000000020000000 x12: 0000000000000000
[   44.242710] x11: ffff8000811a6370 x10: 0000000000000144 x9 : ffff8000811fe370
[   44.250959] x8 : 0000000000017fe8 x7 : 00000000fffff000 x6 : ffff8000811fe370
[   44.259206] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
[   44.267457] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000002203240
[   44.275703] Call trace:
[   44.279158] remove_vm_area (mm/vmalloc.c:3189 (discriminator 1))
[   44.283858] vfree (mm/vmalloc.c:3322)
[   44.287835] execmem_free (mm/execmem.c:70)
[   44.292347] bpf_jit_free_exec+0x10/0x1c
[   44.297283] bpf_prog_pack_free (kernel/bpf/core.c:1006)
[   44.302457] bpf_jit_binary_pack_free (kernel/bpf/core.c:1195)
[   44.307951] bpf_jit_free (include/linux/filter.h:1083 arch/arm64/net/bpf_jit_comp.c:2474)
[   44.312342] bpf_prog_free_deferred (kernel/bpf/core.c:2785)
[   44.317785] process_one_work (kernel/workqueue.c:3273)
[   44.322684] worker_thread (kernel/workqueue.c:3342 (discriminator 2) kernel/workqueue.c:3429 (discriminator 2))
[   44.327292] kthread (kernel/kthread.c:388)
[   44.331342] ret_from_fork (arch/arm64/kernel/entry.S:861)

The problem is because bpf_arch_text_copy() silently fails to write to the
read-only area as a result of patch_map() faulting and the resulting
-EFAULT being chucked away.

Update patch_map() to use CONFIG_EXECMEM instead of
CONFIG_STRICT_MODULE_RWX to check for vmalloc addresses.

Link: https://lkml.kernel.org/r/20240521213813.703309-1-rppt@xxxxxxxxxx
Fixes: 2c9e5d4a0082 ("bpf: remove CONFIG_BPF_JIT dependency on CONFIG_MODULES of")
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Reported-by: Klara Modin <klarasmodin@xxxxxxxxx>
Closes: https://lore.kernel.org/all/7983fbbf-0127-457c-9394-8d6e4299c685@xxxxxxxxx
Tested-by: Klara Modin <klarasmodin@xxxxxxxxx>
Cc: Björn Töpel <bjorn@xxxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 arch/arm64/kernel/patching.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/kernel/patching.c~arm64-patching-fix-handling-of-execmem-addresses
+++ a/arch/arm64/kernel/patching.c
@@ -36,7 +36,7 @@ static void __kprobes *patch_map(void *a
 
 	if (image)
 		page = phys_to_page(__pa_symbol(addr));
-	else if (IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
+	else if (IS_ENABLED(CONFIG_EXECMEM))
 		page = vmalloc_to_page(addr);
 	else
 		return addr;
_

Patches currently in -mm which might be from will@xxxxxxxxxx are

arm64-patching-fix-handling-of-execmem-addresses.patch





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