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Fri, 21 Mar 2025 09:25:49 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id MTRaJp0w3WdYGQAAD6G6ig (envelope-from ); Fri, 21 Mar 2025 09:25:49 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 7a6d88b2-0636-11f0-9ffa-bf95429c2676 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1742549149; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jRl2WQrPM47yD+AI8wwwhvNT+l4iLc6RLY7/18FmBWM=; b=g7ldaqdNgS8V2/ZT0oYPT4jSVMYntY2X/qr2JYWIKjeT7roT8nKxrA2oNV9ir6E5pGIZLU 66flxxbSsyJyQVnvRVUnUqIEAmy2e9IjziIE1ah77FuCrQAz9mp9eoA8AWU85618gIMGcy UcvWtvZTTde+MaQ/GGsBfrFg+DKDB5E= Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.com header.s=susede1 header.b=g7ldaqdN DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1742549149; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jRl2WQrPM47yD+AI8wwwhvNT+l4iLc6RLY7/18FmBWM=; b=g7ldaqdNgS8V2/ZT0oYPT4jSVMYntY2X/qr2JYWIKjeT7roT8nKxrA2oNV9ir6E5pGIZLU 66flxxbSsyJyQVnvRVUnUqIEAmy2e9IjziIE1ah77FuCrQAz9mp9eoA8AWU85618gIMGcy UcvWtvZTTde+MaQ/GGsBfrFg+DKDB5E= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 10/12] kexec: switch read-only area to be writable again Date: Fri, 21 Mar 2025 10:24:49 +0100 Message-ID: <20250321092451.17309-11-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250321092451.17309-1-jgross@suse.com> References: <20250321092451.17309-1-jgross@suse.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: CEBA621B2C X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; MIME_TRACE(0.00)[0:+]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_DN_SOME(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,suse.com:dkim,suse.com:mid,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]; RCVD_TLS_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; DKIM_TRACE(0.00)[suse.com:+] X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action In order to allow writing the new kernel, make the readonly area covering current kernel text writable again. Signed-off-by: Juergen Gross --- kexec.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kexec.c b/kexec.c index 16a0030a..2992f58f 100644 --- a/kexec.c +++ b/kexec.c @@ -184,6 +184,8 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) goto err; } + change_readonly(false); + ret = kexec_move_used_pages(kexec_last_addr, (unsigned long)kernel, kernel_size); if ( ret ) @@ -193,6 +195,7 @@ int kexec(void *kernel, unsigned long kernel_size, const char *cmdline) ret = ENOSYS; err: + change_readonly(true); unreserve_memory_below(); kexec_move_used_pages_undo(); kexec_get_entry_undo();