| Message ID | 355e7c0dadaa2bb79d22e0b7aac7e4efc1114d49.1552679409.git.andreyknvl@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | arm64: untag user pointers passed to the kernel | expand |
On Fri, 15 Mar 2019 20:51:34 +0100 Andrey Konovalov <andreyknvl@google.com> wrote: > This patch is a part of a series that extends arm64 kernel ABI to allow to > pass tagged user pointers (with the top byte set to something else other > than 0x00) as syscall arguments. > > seq_print_user_ip() uses provided user pointers for vma lookups, which > can only by done with untagged pointers. > > Untag user pointers in this function. > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com> > --- > kernel/trace/trace_output.c | 5 +++-- > p | 45 +++++++++++++++++++++++++++++++++++++ > 2 files changed, 48 insertions(+), 2 deletions(-) > create mode 100644 p > > diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c > index 54373d93e251..6376bee93c84 100644 > --- a/kernel/trace/trace_output.c > +++ b/kernel/trace/trace_output.c > @@ -370,6 +370,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, > { > struct file *file = NULL; > unsigned long vmstart = 0; > + unsigned long untagged_ip = untagged_addr(ip); > int ret = 1; > > if (s->full) > @@ -379,7 +380,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, > const struct vm_area_struct *vma; > > down_read(&mm->mmap_sem); > - vma = find_vma(mm, ip); > + vma = find_vma(mm, untagged_ip); > if (vma) { > file = vma->vm_file; > vmstart = vma->vm_start; > @@ -388,7 +389,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, > ret = trace_seq_path(s, &file->f_path); > if (ret) > trace_seq_printf(s, "[+0x%lx]", > - ip - vmstart); > + untagged_ip - vmstart); > } > up_read(&mm->mmap_sem); > } > diff --git a/p b/p > new file mode 100644 > index 000000000000..9d6fa5386e55 > --- /dev/null > +++ b/p > @@ -0,0 +1,45 @@ > +commit 1fa6fadf644859e8a6a8ecce258444b49be8c7ee > +Author: Andrey Konovalov <andreyknvl@google.com> > +Date: Mon Mar 4 17:20:32 2019 +0100 > + > + kasan: fix coccinelle warnings in kasan_p*_table > + > + kasan_p4d_table, kasan_pmd_table and kasan_pud_table are declared as > + returning bool, but return 0 instead of false, which produces a coccinelle > + warning. Fix it. > + > + Fixes: 0207df4fa1a8 ("kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN") > + Reported-by: kbuild test robot <lkp@intel.com> > + Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Did you mean to append this commit to this patch? -- Steve > + > +diff --git a/mm/kasan/init.c b/mm/kasan/init.c > +index 45a1b5e38e1e..fcaa1ca03175 100644 > +--- a/mm/kasan/init.c > ++++ b/mm/kasan/init.c > +@@ -42,7 +42,7 @@ static inline bool kasan_p4d_table(pgd_t pgd) > + #else > + static inline bool kasan_p4d_table(pgd_t pgd) > + { > +- return 0; > ++ return false; > + } > + #endif > + #if CONFIG_PGTABLE_LEVELS > 3 > +@@ -54,7 +54,7 @@ static inline bool kasan_pud_table(p4d_t p4d) > + #else > + static inline bool kasan_pud_table(p4d_t p4d) > + { > +- return 0; > ++ return false; > + } > + #endif > + #if CONFIG_PGTABLE_LEVELS > 2 > +@@ -66,7 +66,7 @@ static inline bool kasan_pmd_table(pud_t pud) > + #else > + static inline bool kasan_pmd_table(pud_t pud) > + { > +- return 0; > ++ return false; > + } > + #endif > + pte_t kasan_early_shadow_pte[PTRS_PER_PTE] __page_aligned_bss;
On Fri, Mar 15, 2019 at 9:14 PM Steven Rostedt <rostedt@goodmis.org> wrote: > > On Fri, 15 Mar 2019 20:51:34 +0100 > Andrey Konovalov <andreyknvl@google.com> wrote: > > > This patch is a part of a series that extends arm64 kernel ABI to allow to > > pass tagged user pointers (with the top byte set to something else other > > than 0x00) as syscall arguments. > > > > seq_print_user_ip() uses provided user pointers for vma lookups, which > > can only by done with untagged pointers. > > > > Untag user pointers in this function. > > > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com> > > --- > > kernel/trace/trace_output.c | 5 +++-- > > p | 45 +++++++++++++++++++++++++++++++++++++ > > 2 files changed, 48 insertions(+), 2 deletions(-) > > create mode 100644 p > > > > diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c > > index 54373d93e251..6376bee93c84 100644 > > --- a/kernel/trace/trace_output.c > > +++ b/kernel/trace/trace_output.c > > @@ -370,6 +370,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, > > { > > struct file *file = NULL; > > unsigned long vmstart = 0; > > + unsigned long untagged_ip = untagged_addr(ip); > > int ret = 1; > > > > if (s->full) > > @@ -379,7 +380,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, > > const struct vm_area_struct *vma; > > > > down_read(&mm->mmap_sem); > > - vma = find_vma(mm, ip); > > + vma = find_vma(mm, untagged_ip); > > if (vma) { > > file = vma->vm_file; > > vmstart = vma->vm_start; > > @@ -388,7 +389,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, > > ret = trace_seq_path(s, &file->f_path); > > if (ret) > > trace_seq_printf(s, "[+0x%lx]", > > - ip - vmstart); > > + untagged_ip - vmstart); > > } > > up_read(&mm->mmap_sem); > > } > > diff --git a/p b/p > > new file mode 100644 > > index 000000000000..9d6fa5386e55 > > --- /dev/null > > +++ b/p > > @@ -0,0 +1,45 @@ > > +commit 1fa6fadf644859e8a6a8ecce258444b49be8c7ee > > +Author: Andrey Konovalov <andreyknvl@google.com> > > +Date: Mon Mar 4 17:20:32 2019 +0100 > > + > > + kasan: fix coccinelle warnings in kasan_p*_table > > + > > + kasan_p4d_table, kasan_pmd_table and kasan_pud_table are declared as > > + returning bool, but return 0 instead of false, which produces a coccinelle > > + warning. Fix it. > > + > > + Fixes: 0207df4fa1a8 ("kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN") > > + Reported-by: kbuild test robot <lkp@intel.com> > > + Signed-off-by: Andrey Konovalov <andreyknvl@google.com> > > Did you mean to append this commit to this patch? No, did it by mistake. Will remove in v12, thanks for noticing! > > -- Steve > > > + > > +diff --git a/mm/kasan/init.c b/mm/kasan/init.c > > +index 45a1b5e38e1e..fcaa1ca03175 100644 > > +--- a/mm/kasan/init.c > > ++++ b/mm/kasan/init.c > > +@@ -42,7 +42,7 @@ static inline bool kasan_p4d_table(pgd_t pgd) > > + #else > > + static inline bool kasan_p4d_table(pgd_t pgd) > > + { > > +- return 0; > > ++ return false; > > + } > > + #endif > > + #if CONFIG_PGTABLE_LEVELS > 3 > > +@@ -54,7 +54,7 @@ static inline bool kasan_pud_table(p4d_t p4d) > > + #else > > + static inline bool kasan_pud_table(p4d_t p4d) > > + { > > +- return 0; > > ++ return false; > > + } > > + #endif > > + #if CONFIG_PGTABLE_LEVELS > 2 > > +@@ -66,7 +66,7 @@ static inline bool kasan_pmd_table(pud_t pud) > > + #else > > + static inline bool kasan_pmd_table(pud_t pud) > > + { > > +- return 0; > > ++ return false; > > + } > > + #endif > > + pte_t kasan_early_shadow_pte[PTRS_PER_PTE] __page_aligned_bss; >
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 54373d93e251..6376bee93c84 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -370,6 +370,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, { struct file *file = NULL; unsigned long vmstart = 0; + unsigned long untagged_ip = untagged_addr(ip); int ret = 1; if (s->full) @@ -379,7 +380,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, const struct vm_area_struct *vma; down_read(&mm->mmap_sem); - vma = find_vma(mm, ip); + vma = find_vma(mm, untagged_ip); if (vma) { file = vma->vm_file; vmstart = vma->vm_start; @@ -388,7 +389,7 @@ static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, ret = trace_seq_path(s, &file->f_path); if (ret) trace_seq_printf(s, "[+0x%lx]", - ip - vmstart); + untagged_ip - vmstart); } up_read(&mm->mmap_sem); } diff --git a/p b/p new file mode 100644 index 000000000000..9d6fa5386e55 --- /dev/null +++ b/p @@ -0,0 +1,45 @@ +commit 1fa6fadf644859e8a6a8ecce258444b49be8c7ee +Author: Andrey Konovalov <andreyknvl@google.com> +Date: Mon Mar 4 17:20:32 2019 +0100 + + kasan: fix coccinelle warnings in kasan_p*_table + + kasan_p4d_table, kasan_pmd_table and kasan_pud_table are declared as + returning bool, but return 0 instead of false, which produces a coccinelle + warning. Fix it. + + Fixes: 0207df4fa1a8 ("kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN") + Reported-by: kbuild test robot <lkp@intel.com> + Signed-off-by: Andrey Konovalov <andreyknvl@google.com> + +diff --git a/mm/kasan/init.c b/mm/kasan/init.c +index 45a1b5e38e1e..fcaa1ca03175 100644 +--- a/mm/kasan/init.c ++++ b/mm/kasan/init.c +@@ -42,7 +42,7 @@ static inline bool kasan_p4d_table(pgd_t pgd) + #else + static inline bool kasan_p4d_table(pgd_t pgd) + { +- return 0; ++ return false; + } + #endif + #if CONFIG_PGTABLE_LEVELS > 3 +@@ -54,7 +54,7 @@ static inline bool kasan_pud_table(p4d_t p4d) + #else + static inline bool kasan_pud_table(p4d_t p4d) + { +- return 0; ++ return false; + } + #endif + #if CONFIG_PGTABLE_LEVELS > 2 +@@ -66,7 +66,7 @@ static inline bool kasan_pmd_table(pud_t pud) + #else + static inline bool kasan_pmd_table(pud_t pud) + { +- return 0; ++ return false; + } + #endif + pte_t kasan_early_shadow_pte[PTRS_PER_PTE] __page_aligned_bss;
This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. seq_print_user_ip() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in this function. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- kernel/trace/trace_output.c | 5 +++-- p | 45 +++++++++++++++++++++++++++++++++++++ 2 files changed, 48 insertions(+), 2 deletions(-) create mode 100644 p