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Fri, 31 Jan 2025 11:38:42 +0000 (GMT) From: Sourabh Jain To: linuxppc-dev@lists.ozlabs.org Cc: Sourabh Jain , Andrew Morton , Madhavan Srinivasan , Mahesh Salgaonkar , Michael Ellerman , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Hari Bathini , Baoquan He Subject: [PATCH v3 1/7] kexec: Initialize ELF lowest address to ULONG_MAX Date: Fri, 31 Jan 2025 17:08:24 +0530 Message-ID: <20250131113830.925179-2-sourabhjain@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250131113830.925179-1-sourabhjain@linux.ibm.com> References: <20250131113830.925179-1-sourabhjain@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: ieB63_zMsBoY1bOPmlpBdsX9Y-n-S2AS X-Proofpoint-GUID: ieB63_zMsBoY1bOPmlpBdsX9Y-n-S2AS X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-31_04,2025-01-31_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 mlxscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 priorityscore=1501 mlxlogscore=999 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2501310087 Content-Type: text/plain; charset="utf-8" kexec_elf_load() loads an ELF executable and sets the address of the lowest PT_LOAD section to the address held by the lowest_load_addr function argument. To determine the lowest PT_LOAD address, a local variable lowest_addr (type unsigned long) is initialized to UINT_MAX. After loading each PT_LOAD, its address is compared to lowest_addr. If a loaded PT_LOAD address is lower, lowest_addr is updated. However, setting lowest_addr to UINT_MAX won't work when the kernel image is loaded above 4G, as the returned lowest PT_LOAD address would be invalid. This is resolved by initializing lowest_addr to ULONG_MAX instead. This issue was discovered while implementing crashkernel high/low reservation on the PowerPC architecture. Fixes: a0458284f062 ("powerpc: Add support code for kexec_file_load()") Cc: Andrew Morton Cc: Madhavan Srinivasan Cc: Mahesh Salgaonkar Cc: Michael Ellerman Cc: kexec@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Acked-by: Hari Bathini Acked-by: Baoquan He Signed-off-by: Sourabh Jain --- kernel/kexec_elf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/kexec_elf.c b/kernel/kexec_elf.c index d3689632e8b9..3a5c25b2adc9 100644 --- a/kernel/kexec_elf.c +++ b/kernel/kexec_elf.c @@ -390,7 +390,7 @@ int kexec_elf_load(struct kimage *image, struct elfhdr = *ehdr, struct kexec_buf *kbuf, unsigned long *lowest_load_addr) { - unsigned long lowest_addr =3D UINT_MAX; + unsigned long lowest_addr =3D ULONG_MAX; int ret; size_t i; =20 --=20 2.48.1