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Sat, 15 Jul 2023 06:53:43 -0700 (PDT) Received: from stoup.lan ([51.219.12.49]) by smtp.gmail.com with ESMTPSA id k10-20020a5d66ca000000b00313f9085119sm13838014wrw.113.2023.07.15.06.53.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Jul 2023 06:53:42 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: =?utf-8?q?Alex_Benn=C3=A9e?= Subject: [PULL 30/47] linux-user: Widen target_mmap offset argument to off_t Date: Sat, 15 Jul 2023 14:53:00 +0100 Message-Id: <20230715135317.7219-31-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230715135317.7219-1-richard.henderson@linaro.org> References: <20230715135317.7219-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::42e; envelope-from=richard.henderson@linaro.org; helo=mail-wr1-x42e.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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org We build with _FILE_OFFSET_BITS=64, so off_t = off64_t = uint64_t. With an extra cast, this fixes emulation of mmap2, which could overflow the computation of the full value of offset. Reviewed-by: Alex Bennée Signed-off-by: Richard Henderson Message-Id: <20230707204054.8792-14-richard.henderson@linaro.org> --- linux-user/user-mmap.h | 2 +- linux-user/mmap.c | 14 ++++++++------ linux-user/syscall.c | 2 +- 3 files changed, 10 insertions(+), 8 deletions(-) diff --git a/linux-user/user-mmap.h b/linux-user/user-mmap.h index 480ce1c114..3fc986f92f 100644 --- a/linux-user/user-mmap.h +++ b/linux-user/user-mmap.h @@ -20,7 +20,7 @@ int target_mprotect(abi_ulong start, abi_ulong len, int prot); abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, - int flags, int fd, abi_ulong offset); + int flags, int fd, off_t offset); int target_munmap(abi_ulong start, abi_ulong len); abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, abi_ulong new_size, unsigned long flags, diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 12b1308a83..b2c2d85857 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -196,7 +196,7 @@ error: /* map an incomplete host page */ static int mmap_frag(abi_ulong real_start, abi_ulong start, abi_ulong end, - int prot, int flags, int fd, abi_ulong offset) + int prot, int flags, int fd, off_t offset) { abi_ulong real_end, addr; void *host_start; @@ -463,11 +463,12 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align) /* NOTE: all the constants are the HOST ones */ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, - int flags, int fd, abi_ulong offset) + int flags, int fd, off_t offset) { - abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len, + abi_ulong ret, end, real_start, real_end, retaddr, host_len, passthrough_start = -1, passthrough_end = -1; int page_flags; + off_t host_offset; mmap_lock(); trace_target_mmap(start, len, target_prot, flags, fd, offset); @@ -559,7 +560,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, } if (!(flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) { - unsigned long host_start; + uintptr_t host_start; int host_prot; void *p; @@ -578,7 +579,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, goto fail; } /* update start so that it points to the file position at 'offset' */ - host_start = (unsigned long)p; + host_start = (uintptr_t)p; if (!(flags & MAP_ANONYMOUS)) { p = mmap(g2h_untagged(start), len, host_prot, flags | MAP_FIXED, fd, host_offset); @@ -681,7 +682,8 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, /* map the middle (easier) */ if (real_start < real_end) { void *p; - unsigned long offset1; + off_t offset1; + if (flags & MAP_ANONYMOUS) { offset1 = 0; } else { diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 3a89f6b408..a80d33ecf2 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -10591,7 +10591,7 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1, #endif ret = target_mmap(arg1, arg2, arg3, target_to_host_bitmask(arg4, mmap_flags_tbl), - arg5, arg6 << MMAP_SHIFT); + arg5, (off_t)(abi_ulong)arg6 << MMAP_SHIFT); return get_errno(ret); #endif case TARGET_NR_munmap: