On Thu, Nov 12, 2020 at 01:29:06PM +0100, 赵乾利 wrote: > gcore patch: > commit 837182cc6589095c0d08f71f57953c50ad61cc19 > Author: zhaoqianli <zhaoqianli@xxxxxxxxxx> > Date: Thu Nov 12 19:41:01 2020 +0800 > > Fix register parsing error caused by miscalculation of the > starting address of the pt_regs structure on the kernel stack > > Signed-off-by: zhaoqianli <zhaoqianli@xxxxxxxxxx> > > diff --git a/libgcore/gcore_arm64.c b/libgcore/gcore_arm64.c > index 3257389..c828fee 100644 > --- a/libgcore/gcore_arm64.c > +++ b/libgcore/gcore_arm64.c > @@ -28,7 +28,7 @@ static int gpr_get(struct task_context *target, > > BZERO(regs, sizeof(*regs)); > > - readmem(machdep->get_stacktop(target->task) - 16 - SIZE(pt_regs), KVADDR, > + readmem(machdep->get_stacktop(target->task) - machdep->machspec->user_eframe_offset, KVADDR, > regs, sizeof(struct user_pt_regs), "gpr_get: user_pt_regs", > gcore_verbose_error_handle()); > > @@ -124,7 +124,7 @@ static int compat_gpr_get(struct task_context *target, > BZERO(&pt_regs, sizeof(pt_regs)); > BZERO(regs, sizeof(*regs)); > > - readmem(machdep->get_stacktop(target->task) - 16 - SIZE(pt_regs), KVADDR, > + readmem(machdep->get_stacktop(target->task) - machdep->machspec->user_eframe_offset, KVADDR, > &pt_regs, sizeof(struct pt_regs), "compat_gpr_get: pt_regs", > gcore_verbose_error_handle()); The above patch was correct, but it looks like the version that actually landed in the crash-gcore git[0] has a small error. The version in the git retains the "- SIZE(pt_regs)" but that should have been be removed as can be seen in the patch above. [0] https://github.com/fujitsu/crash-gcore/commit/19bfb92e50799a82f7ce6179fb35ccd82061bafd) So a fix like the below is needed to get valid registers: 8<-------------- >From f841c41725fbab3cd4247555a550b496b57eb2a6 Mon Sep 17 00:00:00 2001 From: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx> Date: Tue, 9 Nov 2021 13:45:42 +0100 Subject: [PATCH] arm64: Fix pt_regs miscalculation The user_eframe_offset includes the SIZE(pt_regs) so that should have been removed in commit 19bfb92e50799a82f7ce6179fb35ccd82061bafd ("arm64: Fix miscalculation of the starting address...") but that removal appears to have got lost. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx> --- src/libgcore/gcore_arm64.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/libgcore/gcore_arm64.c b/src/libgcore/gcore_arm64.c index 678da8d..da9c647 100644 --- a/src/libgcore/gcore_arm64.c +++ b/src/libgcore/gcore_arm64.c @@ -29,7 +29,7 @@ static int gpr_get(struct task_context *target, BZERO(regs, sizeof(*regs)); readmem(machdep->get_stacktop(target->task) - - machdep->machspec->user_eframe_offset - SIZE(pt_regs), KVADDR, + machdep->machspec->user_eframe_offset, KVADDR, regs, sizeof(struct user_pt_regs), "gpr_get: user_pt_regs", gcore_verbose_error_handle()); @@ -126,7 +126,7 @@ static int compat_gpr_get(struct task_context *target, BZERO(regs, sizeof(*regs)); readmem(machdep->get_stacktop(target->task) - - machdep->machspec->user_eframe_offset - SIZE(pt_regs), KVADDR, + machdep->machspec->user_eframe_offset, KVADDR, &pt_regs, sizeof(struct pt_regs), "compat_gpr_get: pt_regs", gcore_verbose_error_handle()); -- 2.28.0 -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/crash-utility
