From: Yury Norov ynorov@caviumnetworks.com
maillist inclusion category: feature bugzilla: 46790 CVE: NA
Reference: https://github.com/norov/linux/commits/ilp32-5.2
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ILP32 has context-related structures different from both aarch32 and aarch64/lp64. In this patch compat_arch_ptrace() renamed to compat_a32_ptrace(), and compat_arch_ptrace() only makes choice between compat_a32_ptrace() and new compat_ilp32_ptrace() handler.
compat_ilp32_ptrace() calls generic compat_ptrace_request() for all requests except PTRACE_GETSIGMASK and PTRACE_SETSIGMASK, which need special handling.
Signed-off-by: Yury Norov ynorov@caviumnetworks.com Signed-off-by: Bamvor Jian Zhang bamv2005@gmail.com Signed-off-by: Yury Norov ynorov@marvell.com Signed-off-by: Xiongfeng Wang wangxiongfeng2@huawei.com --- arch/arm64/kernel/ptrace.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 68ad17f7ef97..358f0dea270b 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -1197,9 +1197,11 @@ static const struct user_regset_view user_aarch64_view = { .regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets) };
-#ifdef CONFIG_AARCH32_EL0 +#ifdef CONFIG_COMPAT #include <linux/compat.h> +#endif
+#ifdef CONFIG_AARCH32_EL0 enum compat_regset { REGSET_COMPAT_GPR, REGSET_COMPAT_VFP, @@ -1636,7 +1638,7 @@ static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num, } #endif /* CONFIG_HAVE_HW_BREAKPOINT */
-long compat_arch_ptrace(struct task_struct *child, compat_long_t request, +static long compat_a32_ptrace(struct task_struct *child, compat_long_t request, compat_ulong_t caddr, compat_ulong_t cdata) { unsigned long addr = caddr; @@ -1713,8 +1715,23 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
return ret; } + +#else +#define compat_a32_ptrace(child, request, caddr, cdata) (0) #endif /* CONFIG_AARCH32_EL0 */
+#ifdef CONFIG_COMPAT +long compat_arch_ptrace(struct task_struct *child, compat_long_t request, + compat_ulong_t caddr, compat_ulong_t cdata) +{ + if (is_a32_compat_task()) + return compat_a32_ptrace(child, request, caddr, cdata); + + /* ILP32 */ + return compat_ptrace_request(child, request, caddr, cdata); +} +#endif + const struct user_regset_view *task_user_regset_view(struct task_struct *task) { #ifdef CONFIG_AARCH32_EL0