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([2602:ae:1544:6601:6705:aa17:3641:e634]) by smtp.gmail.com with ESMTPSA id d2-20020a17090a6f0200b0023440af7aafsm7902708pjk.9.2023.03.27.14.18.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Mar 2023 14:18:34 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: alex.bennee@linaro.org, philmd@linaro.org Subject: [PATCH for-8.0 v2 10/12] linux-user: Pass last not end to probe_guest_base Date: Mon, 27 Mar 2023 14:18:22 -0700 Message-Id: <20230327211824.1785547-11-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230327211824.1785547-1-richard.henderson@linaro.org> References: <20230327211824.1785547-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1035; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1035.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 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Pass the address of the last byte of the image, rather than the first address past the last byte. This avoids overflow when the last page of the address space is involved. Signed-off-by: Richard Henderson --- linux-user/elfload.c | 24 ++++++++++++------------ linux-user/flatload.c | 2 +- 2 files changed, 13 insertions(+), 13 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index fa4cc41567..dfae967908 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -2504,7 +2504,7 @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr, if (guest_hiaddr > reserved_va) { error_report("%s: requires more than reserved virtual " "address space (0x%" PRIx64 " > 0x%lx)", - image_name, (uint64_t)guest_hiaddr, reserved_va); + image_name, (uint64_t)guest_hiaddr + 1, reserved_va); exit(EXIT_FAILURE); } } else { @@ -2512,7 +2512,7 @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr, if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) { error_report("%s: requires more virtual address space " "than the host can provide (0x%" PRIx64 ")", - image_name, (uint64_t)guest_hiaddr - guest_base); + image_name, (uint64_t)guest_hiaddr + 1 - guest_base); exit(EXIT_FAILURE); } #endif @@ -2525,18 +2525,18 @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr, if (reserved_va) { guest_loaddr = (guest_base >= mmap_min_addr ? 0 : mmap_min_addr - guest_base); - guest_hiaddr = reserved_va; + guest_hiaddr = reserved_va - 1; } /* Reserve the address space for the binary, or reserved_va. */ test = g2h_untagged(guest_loaddr); - addr = mmap(test, guest_hiaddr - guest_loaddr, PROT_NONE, flags, -1, 0); + addr = mmap(test, guest_hiaddr - guest_loaddr + 1, PROT_NONE, flags, -1, 0); if (test != addr) { pgb_fail_in_use(image_name); } qemu_log_mask(CPU_LOG_PAGE, - "%s: base @ %p for " TARGET_ABI_FMT_ld " bytes\n", - __func__, addr, guest_hiaddr - guest_loaddr); + "%s: base @ %p for %" PRIu64 " bytes\n", + __func__, addr, (uint64_t)guest_hiaddr - guest_loaddr + 1); } /** @@ -2680,7 +2680,7 @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr, if (hiaddr != orig_hiaddr) { error_report("%s: requires virtual address space that the " "host cannot provide (0x%" PRIx64 ")", - image_name, (uint64_t)orig_hiaddr); + image_name, (uint64_t)orig_hiaddr + 1); exit(EXIT_FAILURE); } @@ -2694,7 +2694,7 @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr, * arithmetic wraps around. */ if (sizeof(uintptr_t) == 8 || loaddr >= 0x80000000u) { - hiaddr = (uintptr_t) 4 << 30; + hiaddr = UINT32_MAX; } else { offset = -(HI_COMMPAGE & -align); } @@ -2702,7 +2702,7 @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr, loaddr = MIN(loaddr, LO_COMMPAGE & -align); } - addr = pgb_find_hole(loaddr, hiaddr - loaddr, align, offset); + addr = pgb_find_hole(loaddr, hiaddr - loaddr + 1, align, offset); if (addr == -1) { /* * If HI_COMMPAGE, there *might* be a non-consecutive allocation @@ -2755,7 +2755,7 @@ static void pgb_reserved_va(const char *image_name, abi_ulong guest_loaddr, if (guest_hiaddr > reserved_va) { error_report("%s: requires more than reserved virtual " "address space (0x%" PRIx64 " > 0x%lx)", - image_name, (uint64_t)guest_hiaddr, reserved_va); + image_name, (uint64_t)guest_hiaddr + 1, reserved_va); exit(EXIT_FAILURE); } @@ -3021,7 +3021,7 @@ static void load_elf_image(const char *image_name, int image_fd, if (a < loaddr) { loaddr = a; } - a = eppnt->p_vaddr + eppnt->p_memsz; + a = eppnt->p_vaddr + eppnt->p_memsz - 1; if (a > hiaddr) { hiaddr = a; } @@ -3112,7 +3112,7 @@ static void load_elf_image(const char *image_name, int image_fd, * In both cases, we will overwrite pages in this range with mappings * from the executable. */ - load_addr = target_mmap(loaddr, hiaddr - loaddr, PROT_NONE, + load_addr = target_mmap(loaddr, (size_t)hiaddr - loaddr + 1, PROT_NONE, MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | (ehdr->e_type == ET_EXEC ? MAP_FIXED : 0), -1, 0); diff --git a/linux-user/flatload.c b/linux-user/flatload.c index e99570ca18..5efec2630e 100644 --- a/linux-user/flatload.c +++ b/linux-user/flatload.c @@ -448,7 +448,7 @@ static int load_flat_file(struct linux_binprm * bprm, * Allocate the address space. */ probe_guest_base(bprm->filename, 0, - text_len + data_len + extra + indx_len); + text_len + data_len + extra + indx_len - 1); /* * there are a couple of cases here, the separate code/data -- 2.34.1