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Message-Id: <1334961696-19580-1-git-send-email-asharma@fb.com> Date: Fri, 20 Apr 2012 15:41:32 -0700 From: Arun Sharma <asharma@...com> To: linux-kernel@...r.kernel.org Cc: Arun Sharma <asharma@...com> Subject: [PATCH 0/4] perf: Support multiple stacks (v3) If userspace has two or more stacks and we happen to take a sample when the stack pointer is pointing to a higher stack, we get truncated callchains. This patch series tries to address that. Changelog: v3: add explicit checks to copy_from_user_nmi v3: add explicit checks in perf_callchain_user* v2: do this for compat32 as well v2: improve safety checks and reduce max callchain size Arun Sharma (4): perf, x86: Allow multiple stacks perf: Limit callchains to 127 perf, x86: Check if user fp is valid x86: Check user address explicitly in copy_from_user_nmi() arch/x86/include/asm/uaccess.h | 13 +++++++------ arch/x86/kernel/cpu/perf_event.c | 11 +++++++++-- arch/x86/lib/usercopy.c | 3 +++ include/linux/perf_event.h | 2 +- 4 files changed, 20 insertions(+), 9 deletions(-) -- 1.7.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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