DigiGoon/android_kernel_xiaomi_sm8350
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Revert "arm64: probes: Fix uprobes for big-endian kernels"

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This reverts commit e6ab336213 which is
commit 13f8f1e05f1dc36dbba6cba0ae03354c0dafcde7 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Iddbda00bfb1246f4ddf99af31d251287784ec5b7
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman 2024-11-09 14:32:27 +00:00
parent 73ec729f1b
commit 9d6ed89ef0
2 changed files with 7 additions and 5 deletions
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8
arch/arm64/include/asm/uprobes.h
View file

@ -10,9 +10,11 @@
#include <asm/insn.h>
#include <asm/probes.h>
#define MAX_UINSN_BYTES AARCH64_INSN_SIZE
#define UPROBE_SWBP_INSN cpu_to_le32(BRK64_OPCODE_UPROBES)
#define UPROBE_SWBP_INSN_SIZE AARCH64_INSN_SIZE
#define UPROBE_XOL_SLOT_BYTES AARCH64_INSN_SIZE
#define UPROBE_XOL_SLOT_BYTES MAX_UINSN_BYTES
typedef u32 uprobe_opcode_t;
@ -21,8 +23,8 @@ struct arch_uprobe_task {
struct arch_uprobe {
union {
__le32 insn;
__le32 ixol;
u8 insn[MAX_UINSN_BYTES];
u8 ixol[MAX_UINSN_BYTES];
};
struct arch_probe_insn api;
bool simulate;

4
arch/arm64/kernel/probes/uprobes.c
View file

@ -42,7 +42,7 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
else if (!IS_ALIGNED(addr, AARCH64_INSN_SIZE))
return -EINVAL;
insn = le32_to_cpu(auprobe->insn);
insn = *(probe_opcode_t *)(&auprobe->insn[0]);
switch (arm_probe_decode_insn(insn, &auprobe->api)) {
case INSN_REJECTED:
@ -108,7 +108,7 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
if (!auprobe->simulate)
return false;
insn = le32_to_cpu(auprobe->insn);
insn = *(probe_opcode_t *)(&auprobe->insn[0]);
addr = instruction_pointer(regs);
if (auprobe->api.handler)