From: Vincent Whitchurch <vincent.whitchurch@axis.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org> Cc: <kernel@axis.com>, Vincent Whitchurch <vincent.whitchurch@axis.com>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org> Subject: [PATCH v2] arm64: ptdump: Support userspace page tables Date: Thu, 14 Oct 2021 10:14:41 +0200 [thread overview] Message-ID: <20211014081441.7982-1-vincent.whitchurch@axis.com> (raw) The kernel_page_tables debugfs file can be used to examine the page table entries for mappings in kernel space but there is currently no easy way to check userspace mappings. /proc/*/pagemap provides some information but it does not include architecture-specific details such as the memory type (Normal, Device etc). Add a user_page_tables debugfs file to dump out the userspace page tables for the current process. This is enabled by the same config options as kernel_page_tables. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> --- Notes: v2: Reworded commit message. arch/arm64/mm/ptdump.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c index 1c403536c9bb..91a62f07eae2 100644 --- a/arch/arm64/mm/ptdump.c +++ b/arch/arm64/mm/ptdump.c @@ -309,6 +309,7 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, void ptdump_walk(struct seq_file *s, struct ptdump_info *info) { + struct mm_struct *mm = info->mm ?: current->mm; unsigned long end = ~0UL; struct pg_state st; @@ -328,7 +329,7 @@ void ptdump_walk(struct seq_file *s, struct ptdump_info *info) } }; - ptdump_walk_pgd(&st.ptdump, info->mm, NULL); + ptdump_walk_pgd(&st.ptdump, mm, NULL); } static void __init ptdump_initialize(void) @@ -347,6 +348,16 @@ static struct ptdump_info kernel_ptdump_info = { .base_addr = PAGE_OFFSET, }; +static struct addr_marker user_address_markers[] = { + { 0, "Userspace memory start" }, + { 0 /* TASK_SIZE_64 */, "Userspace memory end" }, + { -1, NULL }, +}; + +static struct ptdump_info user_ptdump_info = { + .markers = user_address_markers, +}; + void ptdump_check_wx(void) { struct pg_state st = { @@ -381,8 +392,10 @@ static int __init ptdump_init(void) #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START; #endif + user_address_markers[1].start_address = TASK_SIZE_64; ptdump_initialize(); ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables"); + ptdump_debugfs_register(&user_ptdump_info, "user_page_tables"); return 0; } device_initcall(ptdump_init); -- 2.28.0
WARNING: multiple messages have this Message-ID (diff)
From: Vincent Whitchurch <vincent.whitchurch@axis.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org> Cc: <kernel@axis.com>, Vincent Whitchurch <vincent.whitchurch@axis.com>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org> Subject: [PATCH v2] arm64: ptdump: Support userspace page tables Date: Thu, 14 Oct 2021 10:14:41 +0200 [thread overview] Message-ID: <20211014081441.7982-1-vincent.whitchurch@axis.com> (raw) The kernel_page_tables debugfs file can be used to examine the page table entries for mappings in kernel space but there is currently no easy way to check userspace mappings. /proc/*/pagemap provides some information but it does not include architecture-specific details such as the memory type (Normal, Device etc). Add a user_page_tables debugfs file to dump out the userspace page tables for the current process. This is enabled by the same config options as kernel_page_tables. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> --- Notes: v2: Reworded commit message. arch/arm64/mm/ptdump.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c index 1c403536c9bb..91a62f07eae2 100644 --- a/arch/arm64/mm/ptdump.c +++ b/arch/arm64/mm/ptdump.c @@ -309,6 +309,7 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, void ptdump_walk(struct seq_file *s, struct ptdump_info *info) { + struct mm_struct *mm = info->mm ?: current->mm; unsigned long end = ~0UL; struct pg_state st; @@ -328,7 +329,7 @@ void ptdump_walk(struct seq_file *s, struct ptdump_info *info) } }; - ptdump_walk_pgd(&st.ptdump, info->mm, NULL); + ptdump_walk_pgd(&st.ptdump, mm, NULL); } static void __init ptdump_initialize(void) @@ -347,6 +348,16 @@ static struct ptdump_info kernel_ptdump_info = { .base_addr = PAGE_OFFSET, }; +static struct addr_marker user_address_markers[] = { + { 0, "Userspace memory start" }, + { 0 /* TASK_SIZE_64 */, "Userspace memory end" }, + { -1, NULL }, +}; + +static struct ptdump_info user_ptdump_info = { + .markers = user_address_markers, +}; + void ptdump_check_wx(void) { struct pg_state st = { @@ -381,8 +392,10 @@ static int __init ptdump_init(void) #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) address_markers[KASAN_START_NR].start_address = KASAN_SHADOW_START; #endif + user_address_markers[1].start_address = TASK_SIZE_64; ptdump_initialize(); ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables"); + ptdump_debugfs_register(&user_ptdump_info, "user_page_tables"); return 0; } device_initcall(ptdump_init); -- 2.28.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-10-14 8:14 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-14 8:14 Vincent Whitchurch [this message] 2021-10-14 8:14 ` [PATCH v2] arm64: ptdump: Support userspace page tables Vincent Whitchurch
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