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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id t10-20020a05600c450a00b004131388d948sm14425266wmo.0.2024.03.11.12.12.47 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Mar 2024 12:12:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1710184368; x=1710789168; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=D8bGr2tLFSsGuLe+R12MdDwd+oLrPAXm9STkJvPYqVM=; b=tvraFvxp8EQN0Mh2FPTasCiYmAPikVvR4BJOSJWyckmLXfsEtVbN1GvRU0LfOlsXXb Zz8GcT6pP4p9rRPUoMJ9J2RwqBNAWHUaUodnY6ZNB7neJLoS3d2l/RPmB8DMiF1pSTdI bq9YmGg6FTGxe4snUOBtMxNWsn7aXSV6G1F1XSdE8T/S/UTy/7DLp/f4IpGBCFiwfHAM tsxLoK5RVaJ947f+nSXZtWcKrLZAOTrO2k/4xHS0RcFO5njWVLOsOqN6YfgD+lpd+L58 kT3a1vMEoMhJePC3/MmuwpnzxrKiQn7EMCpqeleiHviQjrnCu0CpkhJntrPSVBlEM+L6 9SqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710184368; x=1710789168; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=D8bGr2tLFSsGuLe+R12MdDwd+oLrPAXm9STkJvPYqVM=; b=xTAzBWEPjmju4XK4LqAlUFvnsB7efMeJDpBeimy5RKnOsl8RSiqNJqJJ48KrhG07CT 3PmMLsBF2Z+L0vPdcsIeVTzr0SaRvk4j8vvbJbbOgHBL1b+z6gAKexpusrR5G91ctkoN JePLr5r0xXpbf7GuPJp0ByNtzt7GnhFtXjUAylF2lIZU8O03fg4qZF+xcdAZFyTcLETq IUhGtzPBt7JOYxbCX7pBYvGYdxMBxXnzuMRDtPS3wbOj73rzJJOjKTM299fTOJltniQF IVguaPD+aJYfREql0xfObVEk9xDlUmO/hwk/QwGCFOXD3cXqoZO/ElEFunWksWrCZJIn pHKg== X-Gm-Message-State: AOJu0YyQCVgJnUb1sP519VRHjiciphTln7Be5FuGoWrnIb3bncYaqUNq OTMn7Gi75VBOgfYiiBCzdKBAcygY9QDlDTS/eSE23ukUj28+m/VXulWBOxpq3QPG1LeSzsynX/S I X-Google-Smtp-Source: AGHT+IF9z+vz3gPBxT+qAGNkRA3fXz12xPpjqEu3XwP9flaJzA5mh6JhW3NJu1rv6gCf2CYIaNohSw== X-Received: by 2002:a05:6000:22e:b0:33e:7b39:6739 with SMTP id l14-20020a056000022e00b0033e7b396739mr7753343wrz.0.1710184367981; Mon, 11 Mar 2024 12:12:47 -0700 (PDT) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 11/20] contrib/elf2dmp: Always check for PA resolution failure Date: Mon, 11 Mar 2024 19:12:32 +0000 Message-Id: <20240311191241.4177990-12-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240311191241.4177990-1-peter.maydell@linaro.org> References: <20240311191241.4177990-1-peter.maydell@linaro.org> MIME-Version: 1.0 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=2a00:1450:4864:20::435; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x435.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: 1710184603233100001 Content-Type: text/plain; charset="utf-8" From: Akihiko Odaki Not checking PA resolution failure can result in NULL deference. Signed-off-by: Akihiko Odaki Reviewed-by: Peter Maydell Tested-by: Viktor Prutyanov Message-id: 20240307-elf2dmp-v4-10-4f324ad4d99d@daynix.com Signed-off-by: Peter Maydell --- contrib/elf2dmp/addrspace.c | 46 +++++++++++++++++++++++-------------- 1 file changed, 29 insertions(+), 17 deletions(-) diff --git a/contrib/elf2dmp/addrspace.c b/contrib/elf2dmp/addrspace.c index c995c723ae8..e01860d15b0 100644 --- a/contrib/elf2dmp/addrspace.c +++ b/contrib/elf2dmp/addrspace.c @@ -22,7 +22,7 @@ static struct pa_block *pa_space_find_block(struct pa_spa= ce *ps, uint64_t pa) return NULL; } =20 -static uint8_t *pa_space_resolve(struct pa_space *ps, uint64_t pa) +static void *pa_space_resolve(struct pa_space *ps, uint64_t pa) { struct pa_block *block =3D pa_space_find_block(ps, pa); =20 @@ -33,6 +33,19 @@ static uint8_t *pa_space_resolve(struct pa_space *ps, ui= nt64_t pa) return block->addr + (pa - block->paddr); } =20 +static bool pa_space_read64(struct pa_space *ps, uint64_t pa, uint64_t *va= lue) +{ + uint64_t *resolved =3D pa_space_resolve(ps, pa); + + if (!resolved) { + return false; + } + + *value =3D *resolved; + + return true; +} + static void pa_block_align(struct pa_block *b) { uint64_t low_align =3D ((b->paddr - 1) | ELF2DMP_PAGE_MASK) + 1 - b->p= addr; @@ -106,19 +119,20 @@ void va_space_create(struct va_space *vs, struct pa_s= pace *ps, uint64_t dtb) va_space_set_dtb(vs, dtb); } =20 -static uint64_t get_pml4e(struct va_space *vs, uint64_t va) +static bool get_pml4e(struct va_space *vs, uint64_t va, uint64_t *value) { uint64_t pa =3D (vs->dtb & 0xffffffffff000) | ((va & 0xff8000000000) >= > 36); =20 - return *(uint64_t *)pa_space_resolve(vs->ps, pa); + return pa_space_read64(vs->ps, pa, value); } =20 -static uint64_t get_pdpi(struct va_space *vs, uint64_t va, uint64_t pml4e) +static bool get_pdpi(struct va_space *vs, uint64_t va, uint64_t pml4e, + uint64_t *value) { uint64_t pdpte_paddr =3D (pml4e & 0xffffffffff000) | ((va & 0x7FC0000000) >> 27); =20 - return *(uint64_t *)pa_space_resolve(vs->ps, pdpte_paddr); + return pa_space_read64(vs->ps, pdpte_paddr, value); } =20 static uint64_t pde_index(uint64_t va) @@ -131,11 +145,12 @@ static uint64_t pdba_base(uint64_t pdpe) return pdpe & 0xFFFFFFFFFF000; } =20 -static uint64_t get_pgd(struct va_space *vs, uint64_t va, uint64_t pdpe) +static bool get_pgd(struct va_space *vs, uint64_t va, uint64_t pdpe, + uint64_t *value) { uint64_t pgd_entry =3D pdba_base(pdpe) + pde_index(va) * 8; =20 - return *(uint64_t *)pa_space_resolve(vs->ps, pgd_entry); + return pa_space_read64(vs->ps, pgd_entry, value); } =20 static uint64_t pte_index(uint64_t va) @@ -148,11 +163,12 @@ static uint64_t ptba_base(uint64_t pde) return pde & 0xFFFFFFFFFF000; } =20 -static uint64_t get_pte(struct va_space *vs, uint64_t va, uint64_t pgd) +static bool get_pte(struct va_space *vs, uint64_t va, uint64_t pgd, + uint64_t *value) { uint64_t pgd_val =3D ptba_base(pgd) + pte_index(va) * 8; =20 - return *(uint64_t *)pa_space_resolve(vs->ps, pgd_val); + return pa_space_read64(vs->ps, pgd_val, value); } =20 static uint64_t get_paddr(uint64_t va, uint64_t pte) @@ -184,13 +200,11 @@ static uint64_t va_space_va2pa(struct va_space *vs, u= int64_t va) { uint64_t pml4e, pdpe, pgd, pte; =20 - pml4e =3D get_pml4e(vs, va); - if (!is_present(pml4e)) { + if (!get_pml4e(vs, va, &pml4e) || !is_present(pml4e)) { return INVALID_PA; } =20 - pdpe =3D get_pdpi(vs, va, pml4e); - if (!is_present(pdpe)) { + if (!get_pdpi(vs, va, pml4e, &pdpe) || !is_present(pdpe)) { return INVALID_PA; } =20 @@ -198,8 +212,7 @@ static uint64_t va_space_va2pa(struct va_space *vs, uin= t64_t va) return get_1GB_paddr(va, pdpe); } =20 - pgd =3D get_pgd(vs, va, pdpe); - if (!is_present(pgd)) { + if (!get_pgd(vs, va, pdpe, &pgd) || !is_present(pgd)) { return INVALID_PA; } =20 @@ -207,8 +220,7 @@ static uint64_t va_space_va2pa(struct va_space *vs, uin= t64_t va) return get_2MB_paddr(va, pgd); } =20 - pte =3D get_pte(vs, va, pgd); - if (!is_present(pte)) { + if (!get_pte(vs, va, pgd, &pte) || !is_present(pte)) { return INVALID_PA; } =20 --=20 2.34.1