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[124.149.254.207]) by smtp.gmail.com with ESMTPSA id g33-20020a635221000000b0058ee60f8e4dsm19561891pgb.34.2024.01.01.17.58.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Jan 2024 17:58:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1704160728; x=1704765528; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=tnSJisjhmOEPjG/usSlqH7jpNx1heRPl0XkUSpAoUU4=; b=aDr1PqNlVmx4prsdKZJYRIm1vVLFrlbT6SY+3REZiZoWHYh3Oj+ALdajLfoNkPsZh7 PUx6vukihpxMCfj0LC0oRtdffGQukkr80+Egwfr6iE8lzzLGYtjqlKy6vNGA01kyF7Tg RyzeiFyIClFuFE97n/IymEcNvGUmBlIUR+hmNzAcj6WfVP+7om1Bvfm2ODNkrZUP/Goy rxd9w8cUPUl+pAMHEGyOA6/C6rP/AMhq0TCLUDBpMP1vuy9QOc1dLcZ2v1loOFhasIpo G1Yj0MVvUGy6np5T0Eof3ZI82ryXuFCYhbSZarF2GJyQzy2tNNa/KrbGF1hJo3dCGzhd MvrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704160728; x=1704765528; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=tnSJisjhmOEPjG/usSlqH7jpNx1heRPl0XkUSpAoUU4=; b=MEB1pD6rQCL/PwJDuhOsNwFhns2lJ2ZkJIrLxq432uvz3jj+Mx1wAZit4SR1eF9jZf vRl0bXcz6k2panp6KnG0uSIQ54SgFN9Fww7vebqQYhk38+9Pp1dH87oF++J8HyISsg4g QWmy71O+7hcmo1/tYfb2webZwEByx9B1xdpxTg288oot5prnsmk57OSARQ64JvhiQvOK 4Ou+K5cwlDRfg1gshaYsRplqJ+zdqvZJf5b20epDobtJYPp/Lkp/XbgJMTbBuGxGOVl4 4D0i1lHUOfJYxs2xy94BJo1Dn3Aqyg4Yb7hzeESXOsHDt0cCbaJ3vbCSCsXFA8cagwaV Qbag== X-Gm-Message-State: AOJu0Yz40f9+oiqNHmSysAPvqJuGXeV69CriohRRvGsB3IwFCZBPAD/5 VchgXQ3pkEMs80ATrPt4o0VosRi5PtMcIB/aNr4FrS8p/2w= X-Google-Smtp-Source: AGHT+IEAGlexuAg3lxm+T1XIQe1a0LOV0XxZb3TleOCDXhLfRg4LkVgcjkmJOnp+ilwF+MBVdDVeVA== X-Received: by 2002:a05:6a00:1d96:b0:6d9:af31:293b with SMTP id z22-20020a056a001d9600b006d9af31293bmr17005737pfw.61.1704160728179; Mon, 01 Jan 2024 17:58:48 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v3 17/33] linux-user: Move some mmap checks outside the lock Date: Tue, 2 Jan 2024 12:57:52 +1100 Message-Id: <20240102015808.132373-18-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240102015808.132373-1-richard.henderson@linaro.org> References: <20240102015808.132373-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::430; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x430.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1704160763310100004 Basic validation of operands does not require the lock. Hoist them from target_mmap__locked back into target_mmap. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Richard Henderson Reviewed-by: Ilya Leoshkevich --- linux-user/mmap.c | 107 +++++++++++++++++++++++----------------------- 1 file changed, 53 insertions(+), 54 deletions(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index b4c3cc65aa..fbaea832c5 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -491,52 +491,14 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong si= ze, abi_ulong align) } =20 static abi_long target_mmap__locked(abi_ulong start, abi_ulong len, - int target_prot, int flags, + int target_prot, int flags, int page_f= lags, int fd, off_t offset) { int host_page_size =3D qemu_real_host_page_size(); abi_ulong ret, last, real_start, real_last, retaddr, host_len; abi_ulong passthrough_start =3D -1, passthrough_last =3D 0; - int page_flags; off_t host_offset; =20 - if (!len) { - errno =3D EINVAL; - return -1; - } - - page_flags =3D validate_prot_to_pageflags(target_prot); - if (!page_flags) { - errno =3D EINVAL; - return -1; - } - - /* Also check for overflows... */ - len =3D TARGET_PAGE_ALIGN(len); - if (!len) { - errno =3D ENOMEM; - return -1; - } - - if (offset & ~TARGET_PAGE_MASK) { - errno =3D EINVAL; - return -1; - } - - /* - * If we're mapping shared memory, ensure we generate code for parallel - * execution and flush old translations. This will work up to the lev= el - * supported by the host -- anything that requires EXCP_ATOMIC will not - * be atomic with respect to an external process. - */ - if (flags & MAP_SHARED) { - CPUState *cpu =3D thread_cpu; - if (!(cpu->tcg_cflags & CF_PARALLEL)) { - cpu->tcg_cflags |=3D CF_PARALLEL; - tb_flush(cpu); - } - } - real_start =3D start & -host_page_size; host_offset =3D offset & -host_page_size; =20 @@ -616,23 +578,9 @@ static abi_long target_mmap__locked(abi_ulong start, a= bi_ulong len, passthrough_start =3D start; passthrough_last =3D last; } else { - if (start & ~TARGET_PAGE_MASK) { - errno =3D EINVAL; - return -1; - } last =3D start + len - 1; real_last =3D ROUND_UP(last, host_page_size) - 1; =20 - /* - * Test if requested memory area fits target address space - * It can fail only on 64-bit host with 32-bit target. - * On any other target/host host mmap() handles this error correct= ly. - */ - if (last < start || !guest_range_valid_untagged(start, len)) { - errno =3D ENOMEM; - return -1; - } - if (flags & MAP_FIXED_NOREPLACE) { /* Validate that the chosen range is empty. */ if (!page_check_range_empty(start, last)) { @@ -778,13 +726,64 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, = int target_prot, int flags, int fd, off_t offset) { abi_long ret; + int page_flags; =20 trace_target_mmap(start, len, target_prot, flags, fd, offset); + + if (!len) { + errno =3D EINVAL; + return -1; + } + + page_flags =3D validate_prot_to_pageflags(target_prot); + if (!page_flags) { + errno =3D EINVAL; + return -1; + } + + /* Also check for overflows... */ + len =3D TARGET_PAGE_ALIGN(len); + if (!len || len !=3D (size_t)len) { + errno =3D ENOMEM; + return -1; + } + + if (offset & ~TARGET_PAGE_MASK) { + errno =3D EINVAL; + return -1; + } + if (flags & (MAP_FIXED | MAP_FIXED_NOREPLACE)) { + if (start & ~TARGET_PAGE_MASK) { + errno =3D EINVAL; + return -1; + } + if (!guest_range_valid_untagged(start, len)) { + errno =3D ENOMEM; + return -1; + } + } + mmap_lock(); =20 - ret =3D target_mmap__locked(start, len, target_prot, flags, fd, offset= ); + ret =3D target_mmap__locked(start, len, target_prot, flags, + page_flags, fd, offset); =20 mmap_unlock(); + + /* + * If we're mapping shared memory, ensure we generate code for parallel + * execution and flush old translations. This will work up to the lev= el + * supported by the host -- anything that requires EXCP_ATOMIC will not + * be atomic with respect to an external process. + */ + if (ret !=3D -1 && (flags & MAP_TYPE) !=3D MAP_PRIVATE) { + CPUState *cpu =3D thread_cpu; + if (!(cpu->tcg_cflags & CF_PARALLEL)) { + cpu->tcg_cflags |=3D CF_PARALLEL; + tb_flush(cpu); + } + } + return ret; } =20 --=20 2.34.1