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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1786292688; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=4fTW3NKCOnb0Rnw5WpgqtZWsYcNgZWfC8uC6+Vx2Iuw=; b=YpWjhLrijR2mZ1Pkdzk2PKAe73zjTpD6OPzfJ3mcWmm3lMbNWZOkcX0dKv47XfOe/xkpcD O0uWn55eIQMR7uccaALc1U0umAgulN4uzQ+8fXDubqwuq5q+lFP5TJd+dnK8Huw+lqGVTE qN2bu754u2ythKM8KBEvWEl3Xe7T7/A= From: Thorsten Blum To: Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Sourabh Jain , Hari Bathini , Aditya Gupta , Jinjie Ruan , Thiago Jung Bauermann Cc: Thorsten Blum , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH] powerpc/kexec_file: Use inclusive range checks in add_usable_mem() Date: Sun, 9 Aug 2026 18:24:01 +0200 Message-ID: <20260809162403.18142-2-thorsten.blum@linux.dev> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1060; i=thorsten.blum@linux.dev; h=from:subject; bh=cwwb5nITHtXa2CEl8dki2kO1JkWBrSuoRMvXj5sMrbM=; b=owGbwMvMwCUWt7pQ4caZUj3G02pJDFkVKxd7sS0tj7i17KRS04UXgtMuLtvdbC0d/8OnOaA++ OPafbvZOkpZGMS4GGTFFFkezPoxw7e0pnKTScROmDmsTCBDGLg4BWAiHtmMDHvPeWqaLWLeOEep V1d7A2/gH/lAG1ktbYOcE/N68+RuNzEyLEmdWLbr7LZcTXPH7/POPIk/MtV8zqtyrkN/fxy8oZ9 ozQQA X-Developer-Key: i=thorsten.blum@linux.dev; a=openpgp; fpr=1D60735E8AEF3BE473B69D84733678FD8DFEEAD4 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT add_usable_mem() adds usable memory ranges for the kdump kernel. The ranges are inclusive, but the partial overlap check uses exclusive comparisons. This skips ranges with base == loc_end or end == loc_base. Use inclusive comparisons instead. Fixes: 7c64e21a1c5a ("powerpc/kexec_file: Restrict memory usage of kdump kernel") Signed-off-by: Thorsten Blum --- arch/powerpc/kexec/file_load_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c index 8c72e12ea44e..f9e872693ca7 100644 --- a/arch/powerpc/kexec/file_load_64.c +++ b/arch/powerpc/kexec/file_load_64.c @@ -113,7 +113,7 @@ static int add_usable_mem(struct umem_info *um_info, u64 base, u64 end) loc_end = um_info->ranges[i].end; if (loc_base >= base && loc_end <= end) add = true; - else if (base < loc_end && end > loc_base) { + else if (base <= loc_end && end >= loc_base) { if (loc_base < base) loc_base = base; if (loc_end > end)