| Message ID | 1482190646-7720-1-git-send-email-labbott@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 19 December 2016 at 23:37, Laura Abbott <labbott@redhat.com> wrote: > Christopher Covington reported a crash on aarch64 on recent Fedora > kernels: > > kernel BUG at ./include/linux/scatterlist.h:140! > Internal error: Oops - BUG: 0 [#1] PREEMPT SMP > Modules linked in: > CPU: 2 PID: 752 Comm: cryptomgr_test Not tainted 4.9.0-11815-ge93b1cc #162 > Hardware name: linux,dummy-virt (DT) > task: ffff80007c650080 task.stack: ffff800008910000 > PC is at sg_init_one+0xa0/0xb8 > LR is at sg_init_one+0x24/0xb8 > ... > [<ffff000008398db8>] sg_init_one+0xa0/0xb8 > [<ffff000008350a44>] test_acomp+0x10c/0x438 > [<ffff000008350e20>] alg_test_comp+0xb0/0x118 > [<ffff00000834f28c>] alg_test+0x17c/0x2f0 > [<ffff00000834c6a4>] cryptomgr_test+0x44/0x50 > [<ffff0000080dac70>] kthread+0xf8/0x128 > [<ffff000008082ec0>] ret_from_fork+0x10/0x50 > > The test vectors used for input are part of the kernel image. These > inputs are passed as a buffer to sg_init_one which eventually blows up > with BUG_ON(!virt_addr_valid(buf)). On arm64, virt_addr_valid returns > false for the kernel image since virt_to_page will not return the > correct page. The kernel image is also aliased to the linear map so get > the linear alias and pass that to the scatterlist instead. > > Reported-by: Christopher Covington <cov@codeaurora.org> > Fixes: d7db7a882deb ("crypto: acomp - update testmgr with support for acomp") > Signed-off-by: Laura Abbott <labbott@redhat.com> > --- > x86 supports virt_addr_valid working on kernel image addresses but arm64 is > more strict. This is the direction things have been moving with my > CONFIG_DEBUG_VIRTUAL series for arm64 which is tightening the definition of > __pa/__pa_symbol. A helper function would be nice, so that we can call sg_init_table/sg_set_page directly, and avoid the redundant virt_to_phys(__va()) translation (and add a comment *why* we should not use sg_init_one() with the address of a kernel symbol). But I will leave it up to Herbert to decide whether he prefers that or not. In any case, Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > --- > crypto/testmgr.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/crypto/testmgr.c b/crypto/testmgr.c > index f616ad7..f5bac10 100644 > --- a/crypto/testmgr.c > +++ b/crypto/testmgr.c > @@ -1464,7 +1464,7 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate, > > memset(output, 0, dlen); > init_completion(&result.completion); > - sg_init_one(&src, ctemplate[i].input, ilen); > + sg_init_one(&src, __va(__pa_symbol(ctemplate[i].input)), ilen); > sg_init_one(&dst, output, dlen); > > req = acomp_request_alloc(tfm); > @@ -1513,7 +1513,7 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate, > > memset(output, 0, dlen); > init_completion(&result.completion); > - sg_init_one(&src, dtemplate[i].input, ilen); > + sg_init_one(&src, __va(__pa_symbol(dtemplate[i].input)), ilen); > sg_init_one(&dst, output, dlen); > > req = acomp_request_alloc(tfm); > -- > 2.7.4 >
On Mon, Dec 19, 2016 at 03:37:26PM -0800, Laura Abbott wrote: > Christopher Covington reported a crash on aarch64 on recent Fedora > kernels: > > kernel BUG at ./include/linux/scatterlist.h:140! > Internal error: Oops - BUG: 0 [#1] PREEMPT SMP > Modules linked in: > CPU: 2 PID: 752 Comm: cryptomgr_test Not tainted 4.9.0-11815-ge93b1cc #162 > Hardware name: linux,dummy-virt (DT) > task: ffff80007c650080 task.stack: ffff800008910000 > PC is at sg_init_one+0xa0/0xb8 > LR is at sg_init_one+0x24/0xb8 > ... > [<ffff000008398db8>] sg_init_one+0xa0/0xb8 > [<ffff000008350a44>] test_acomp+0x10c/0x438 > [<ffff000008350e20>] alg_test_comp+0xb0/0x118 > [<ffff00000834f28c>] alg_test+0x17c/0x2f0 > [<ffff00000834c6a4>] cryptomgr_test+0x44/0x50 > [<ffff0000080dac70>] kthread+0xf8/0x128 > [<ffff000008082ec0>] ret_from_fork+0x10/0x50 > > The test vectors used for input are part of the kernel image. These > inputs are passed as a buffer to sg_init_one which eventually blows up > with BUG_ON(!virt_addr_valid(buf)). On arm64, virt_addr_valid returns > false for the kernel image since virt_to_page will not return the > correct page. The kernel image is also aliased to the linear map so get > the linear alias and pass that to the scatterlist instead. > > Reported-by: Christopher Covington <cov@codeaurora.org> > Fixes: d7db7a882deb ("crypto: acomp - update testmgr with support for acomp") > Signed-off-by: Laura Abbott <labbott@redhat.com> > --- > x86 supports virt_addr_valid working on kernel image addresses but arm64 is > more strict. This is the direction things have been moving with my > CONFIG_DEBUG_VIRTUAL series for arm64 which is tightening the definition of > __pa/__pa_symbol. Please fix this by copying the templates to kmalloced memory like the other test_* functions. Thanks,
diff --git a/crypto/testmgr.c b/crypto/testmgr.c index f616ad7..f5bac10 100644 --- a/crypto/testmgr.c +++ b/crypto/testmgr.c @@ -1464,7 +1464,7 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate, memset(output, 0, dlen); init_completion(&result.completion); - sg_init_one(&src, ctemplate[i].input, ilen); + sg_init_one(&src, __va(__pa_symbol(ctemplate[i].input)), ilen); sg_init_one(&dst, output, dlen); req = acomp_request_alloc(tfm); @@ -1513,7 +1513,7 @@ static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate, memset(output, 0, dlen); init_completion(&result.completion); - sg_init_one(&src, dtemplate[i].input, ilen); + sg_init_one(&src, __va(__pa_symbol(dtemplate[i].input)), ilen); sg_init_one(&dst, output, dlen); req = acomp_request_alloc(tfm);
Christopher Covington reported a crash on aarch64 on recent Fedora kernels: kernel BUG at ./include/linux/scatterlist.h:140! Internal error: Oops - BUG: 0 [#1] PREEMPT SMP Modules linked in: CPU: 2 PID: 752 Comm: cryptomgr_test Not tainted 4.9.0-11815-ge93b1cc #162 Hardware name: linux,dummy-virt (DT) task: ffff80007c650080 task.stack: ffff800008910000 PC is at sg_init_one+0xa0/0xb8 LR is at sg_init_one+0x24/0xb8 ... [<ffff000008398db8>] sg_init_one+0xa0/0xb8 [<ffff000008350a44>] test_acomp+0x10c/0x438 [<ffff000008350e20>] alg_test_comp+0xb0/0x118 [<ffff00000834f28c>] alg_test+0x17c/0x2f0 [<ffff00000834c6a4>] cryptomgr_test+0x44/0x50 [<ffff0000080dac70>] kthread+0xf8/0x128 [<ffff000008082ec0>] ret_from_fork+0x10/0x50 The test vectors used for input are part of the kernel image. These inputs are passed as a buffer to sg_init_one which eventually blows up with BUG_ON(!virt_addr_valid(buf)). On arm64, virt_addr_valid returns false for the kernel image since virt_to_page will not return the correct page. The kernel image is also aliased to the linear map so get the linear alias and pass that to the scatterlist instead. Reported-by: Christopher Covington <cov@codeaurora.org> Fixes: d7db7a882deb ("crypto: acomp - update testmgr with support for acomp") Signed-off-by: Laura Abbott <labbott@redhat.com> --- x86 supports virt_addr_valid working on kernel image addresses but arm64 is more strict. This is the direction things have been moving with my CONFIG_DEBUG_VIRTUAL series for arm64 which is tightening the definition of __pa/__pa_symbol. --- crypto/testmgr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)