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Mon, 04 Mar 2024 23:36:43 -0800 (PST) From: Akihiko Odaki Date: Tue, 05 Mar 2024 16:36:22 +0900 Subject: [PATCH v2 05/13] contrib/elf2dmp: Always check for PA resolution failure MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240305-elf2dmp-v2-5-86ff2163ad32@daynix.com> References: <20240305-elf2dmp-v2-0-86ff2163ad32@daynix.com> In-Reply-To: <20240305-elf2dmp-v2-0-86ff2163ad32@daynix.com> To: Viktor Prutyanov , Peter Maydell Cc: qemu-devel@nongnu.org, Akihiko Odaki X-Mailer: b4 0.12.3 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: none client-ip=2607:f8b0:4864:20::42f; envelope-from=akihiko.odaki@daynix.com; helo=mail-pf1-x42f.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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 @daynix-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1709624268408100001 Not checking PA resolution failure can result in NULL deference. Signed-off-by: Akihiko Odaki Reviewed-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 c995c723ae80..e01860d15b07 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 2.44.0