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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260228-abyss-mmap-relocation-v1-1-c8ec0476894b@astrafall.org> References: <20260228-abyss-mmap-relocation-v1-0-c8ec0476894b@astrafall.org> In-Reply-To: <20260228-abyss-mmap-relocation-v1-0-c8ec0476894b@astrafall.org> To: qemu-devel@nongnu.org Cc: Laurent Vivier , Warner Losh , =?utf-8?q?Alex_R=C3=B8nne_Petersen?= , Richard Henderson , Pierrick Bouvier , Kyle Evans , =?utf-8?q?Alex_Benn=C3=A9e?= , Bingwu Zhang X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1229; i=xtex@astrafall.org; h=from:subject:message-id; bh=rTfZmcXB35KVF+0oZQFtWTXqSC2+Z2NKT1fd0IuSDek=; b=owGbwMvMwCW2U4Ij7wZL9ETG02pJDJkLT00V6LIQm7jx38qKPYoT75cuUpxT0+286Uns0+NJR zcFm3271zGRhUGMi8FSTJGlyLDBm1UnnV90WbkszBxWJpAh0iINDAwMDCwMfLmJeaVGOkZ6ptqG eoaGOkY6RgxcnAIw1R9eMPx3OTGRoTF04aXLGUKHC3TWXPzwcmd82dQdScfnPZDVVeDfxsjwTFj i3xQjgRKnKDHVY981Em3OMTeuWmm9nM11xtTeye08AA== X-Developer-Key: i=xtex@astrafall.org; a=openpgp; fpr=7231804B052C670F15A6771DB918086ED8045B91 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=157.180.15.194; envelope-from=xtex@envs.net; helo=mail.envs.net X-Spam_score_int: -9 X-Spam_score: -1.0 X-Spam_bar: - X-Spam_report: (-1.0 / 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_VALIDITY_CERTIFIED_BLOCKED=0.706, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.401, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Fri, 27 Feb 2026 12:17:25 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @envs.net) X-ZM-MESSAGEID: 1772212714804158500 From: Bingwu Zhang Fixes: 4c13048e02d9 ("linux-user: Use page_find_range_empty for mmap_find_v= ma_reserved") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/3310 Signed-off-by: Bingwu Zhang --- linux-user/mmap.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 07175e11d576..76978a56a859 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -423,12 +423,15 @@ abi_ulong mmap_next_start; static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size, abi_ulong align) { - target_ulong ret; + target_ulong ret =3D -1; =20 - ret =3D page_find_range_empty(start, reserved_va, size, align); + if (start <=3D reserved_va) { + ret =3D page_find_range_empty(start, reserved_va, size, align); + } if (ret =3D=3D -1 && start > mmap_min_addr) { /* Restart at the beginning of the address space. */ - ret =3D page_find_range_empty(mmap_min_addr, start - 1, size, alig= n); + ret =3D page_find_range_empty(mmap_min_addr, MIN(start - 1, reserv= ed_va), + size, align); } =20 return ret; --=20 2.52.0 From nobody Mon Mar 2 08:46:29 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=quarantine dis=none) header.from=envs.net ARC-Seal: i=1; a=rsa-sha256; t=1772212697; cv=none; d=zohomail.com; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260228-abyss-mmap-relocation-v1-2-c8ec0476894b@astrafall.org> References: <20260228-abyss-mmap-relocation-v1-0-c8ec0476894b@astrafall.org> In-Reply-To: <20260228-abyss-mmap-relocation-v1-0-c8ec0476894b@astrafall.org> To: qemu-devel@nongnu.org Cc: Laurent Vivier , Warner Losh , =?utf-8?q?Alex_R=C3=B8nne_Petersen?= , Richard Henderson , Pierrick Bouvier , Kyle Evans , =?utf-8?q?Alex_Benn=C3=A9e?= , Bingwu Zhang X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1162; i=xtex@astrafall.org; h=from:subject:message-id; bh=7ZViOWjw7i41r2hZsN2jRt+YQI5vco7wj7fO41K7UUM=; b=owGbwMvMwCW2U4Ij7wZL9ETG02pJDJkLT01Nt90o89/8R2nu6y1WQRYc6osZpkQLr92qdPP2B 0MvU/frHRNZGMS4GCzFFFmKDBu8WXXS+UWXlcvCzGFlAhkiLdLAwMDAwMLAl5uYV2qkY6Rnqm2o Z2ioY6RjxMDFKQBTbXSUkeGt5DPmV/Gfnk+I+iOxv/K4z4frx11dmjxe8pVNe/Hwbk4AI8ND+ft 12nNtbG3fbFnxRadx7zPv206i900PmklWPTuXasAMAA== X-Developer-Key: i=xtex@astrafall.org; a=openpgp; fpr=7231804B052C670F15A6771DB918086ED8045B91 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=157.180.15.194; envelope-from=xtex@envs.net; helo=mail.envs.net X-Spam_score_int: -9 X-Spam_score: -1.0 X-Spam_bar: - X-Spam_report: (-1.0 / 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_VALIDITY_CERTIFIED_BLOCKED=0.706, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.401, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Fri, 27 Feb 2026 12:17:25 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @envs.net) X-ZM-MESSAGEID: 1772212702195158500 From: Bingwu Zhang Fixes: f12294b5bd21 ("bsd-user: Use page_find_range_empty for mmap_find_vma= _reserved") Signed-off-by: Bingwu Zhang Reviewed-by: Warner Losh --- bsd-user/mmap.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c index 24ba1728eb55..fe77eceb4856 100644 --- a/bsd-user/mmap.c +++ b/bsd-user/mmap.c @@ -258,12 +258,14 @@ abi_ulong mmap_next_start =3D TASK_UNMAPPED_BASE; static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size, abi_ulong alignment) { - abi_ulong ret; + abi_ulong ret =3D -1; =20 - ret =3D page_find_range_empty(start, reserved_va, size, alignment); + if (start <=3D reserved_va) { + ret =3D page_find_range_empty(start, reserved_va, size, alignment); + } if (ret =3D=3D -1 && start > TARGET_PAGE_SIZE) { /* Restart at the beginning of the address space. */ - ret =3D page_find_range_empty(TARGET_PAGE_SIZE, start - 1, + ret =3D page_find_range_empty(TARGET_PAGE_SIZE, MIN(start - 1, res= erved_va), size, alignment); } =20 --=20 2.52.0 From nobody Mon Mar 2 08:46:29 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=quarantine dis=none) header.from=envs.net ARC-Seal: i=1; a=rsa-sha256; t=1772212697; cv=none; d=zohomail.com; s=zohoarc; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260228-abyss-mmap-relocation-v1-3-c8ec0476894b@astrafall.org> References: <20260228-abyss-mmap-relocation-v1-0-c8ec0476894b@astrafall.org> In-Reply-To: <20260228-abyss-mmap-relocation-v1-0-c8ec0476894b@astrafall.org> To: qemu-devel@nongnu.org Cc: Laurent Vivier , Warner Losh , =?utf-8?q?Alex_R=C3=B8nne_Petersen?= , Richard Henderson , Pierrick Bouvier , Kyle Evans , =?utf-8?q?Alex_Benn=C3=A9e?= , Bingwu Zhang X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2765; i=xtex@astrafall.org; h=from:subject:message-id; bh=VBZ7OSO8iNQWFEeFysNod/fZxXwETdJ5gYcACxtEZfo=; b=owGbwMvMwCW2U4Ij7wZL9ETG02pJDJkLT01VmHJNSSXGh4Hp5MuJ4tHLWLdMOrFcS/CHZdDk1 hthycu2dExkYRDjYrAUU2QpMmzwZtVJ5xddVi4LM4eVCWSItEgDAwMDAwsDX25iXqmRjpGeqbah nqGhjpGOEQMXpwBMdTkLw19ZTn6H0w+9P9ifu9rEyiZ7bnv9TosfNz4n79thEa/DECLGyPDcTD/ mbcrrprkzVMwXpL4zq78RvqpIWOzmqwyLd1tiXPgA X-Developer-Key: i=xtex@astrafall.org; a=openpgp; fpr=7231804B052C670F15A6771DB918086ED8045B91 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=157.180.15.194; envelope-from=xtex@envs.net; helo=mail.envs.net X-Spam_score_int: -9 X-Spam_score: -1.0 X-Spam_bar: - X-Spam_report: (-1.0 / 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_VALIDITY_CERTIFIED_BLOCKED=0.706, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.401, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Fri, 27 Feb 2026 12:17:25 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @envs.net) X-ZM-MESSAGEID: 1772212702222158500 From: Bingwu Zhang Useful for debugging Signed-off-by: Bingwu Zhang --- tests/tcg/multiarch/test-mmap.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/tests/tcg/multiarch/test-mmap.c b/tests/tcg/multiarch/test-mma= p.c index e297f4b1e932..88f7a04101a3 100644 --- a/tests/tcg/multiarch/test-mmap.c +++ b/tests/tcg/multiarch/test-mmap.c @@ -442,19 +442,19 @@ void check_invalid_mmaps(void) =20 /* Attempt to map a zero length page. */ addr =3D mmap(NULL, 0, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - fprintf(stdout, "%s addr=3D%p", __func__, (void *)addr); + fprintf(stdout, "%s addr=3D%p errno=3D%d\n", __func__, (void *)addr, e= rrno); fail_unless(addr =3D=3D MAP_FAILED); fail_unless(errno =3D=3D EINVAL); =20 /* Attempt to map a over length page. */ addr =3D mmap(NULL, -4, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - fprintf(stdout, "%s addr=3D%p", __func__, (void *)addr); + fprintf(stdout, "%s addr=3D%p errno=3D%d\n", __func__, (void *)addr, e= rrno); fail_unless(addr =3D=3D MAP_FAILED); fail_unless(errno =3D=3D ENOMEM); =20 /* Attempt to remap a region which exceeds the bounds of memory. */ addr =3D mremap((void *)((uintptr_t)pagesize * 10), SIZE_MAX & ~(size_= t)pagemask, pagesize, 0); - fprintf(stdout, "%s mremap addr=3D%p", __func__, (void *)addr); + fprintf(stdout, "%s mremap addr=3D%p errno=3D%d\n", __func__, (void *)= addr, errno); fail_unless(addr =3D=3D MAP_FAILED); fail_unless(errno =3D=3D EFAULT); =20 @@ -465,8 +465,11 @@ void check_shrink_mmaps(void) { unsigned char *a, *b, *c; a =3D mmap(NULL, pagesize * 2, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS,= -1, 0); + fprintf(stdout, "%s addr=3D%p errno=3D%d\n", __func__, (void *)a, errn= o); b =3D mmap(NULL, pagesize * 2, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS,= -1, 0); + fprintf(stdout, "%s addr=3D%p errno=3D%d\n", __func__, (void *)b, errn= o); c =3D mmap(NULL, pagesize * 2, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS,= -1, 0); + fprintf(stdout, "%s addr=3D%p errno=3D%d\n", __func__, (void *)c, errn= o); =20 fail_unless(a !=3D MAP_FAILED); fail_unless(b !=3D MAP_FAILED); @@ -479,6 +482,7 @@ void check_shrink_mmaps(void) =20 /* Shrink the middle mapping in-place; the others should be unaffected= */ b =3D mremap(b, pagesize * 2, pagesize, 0); + fprintf(stdout, "%s mremap addr=3D%p errno=3D%d\n", __func__, (void *)= b, errno); fail_unless(b !=3D MAP_FAILED); =20 /* Ensure we can still access all valid mappings */ @@ -489,6 +493,8 @@ void check_shrink_mmaps(void) munmap(a, 2 * pagesize); munmap(b, pagesize); munmap(c, 2 * pagesize); 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260228-abyss-mmap-relocation-v1-4-c8ec0476894b@astrafall.org> References: <20260228-abyss-mmap-relocation-v1-0-c8ec0476894b@astrafall.org> In-Reply-To: <20260228-abyss-mmap-relocation-v1-0-c8ec0476894b@astrafall.org> To: qemu-devel@nongnu.org Cc: Laurent Vivier , Warner Losh , =?utf-8?q?Alex_R=C3=B8nne_Petersen?= , Richard Henderson , Pierrick Bouvier , Kyle Evans , =?utf-8?q?Alex_Benn=C3=A9e?= , Bingwu Zhang X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1372; i=xtex@astrafall.org; h=from:subject:message-id; bh=Ch4YHmmE4DsC/m7FHP6NO4qOoidbitpNHb4YWm7olLM=; b=owGbwMvMwCW2U4Ij7wZL9ETG02pJDJkLT0178499mvyh5r2GEW1VLb4FFv2RE78dzL/kvypyi jhrk8uzjoksDGJcDJZiiixFhg3erDrp/KLLymVh5rAygQyRFmlgYGBgYGHgy03MKzXSMdIz1TbU MzTUMdIxYuDiFICpNnJg+J//xNxe5O7uvjdLO4vZOx4/XqhmvECgo7curieaqTjXjYPhn2nkkQy ObRcfFyfEZU61iw+aEycUmHp8rtD0XzeCLRLW8gMA X-Developer-Key: i=xtex@astrafall.org; a=openpgp; fpr=7231804B052C670F15A6771DB918086ED8045B91 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=157.180.15.194; envelope-from=xtex@envs.net; helo=mail.envs.net X-Spam_score_int: -9 X-Spam_score: -1.0 X-Spam_bar: - X-Spam_report: (-1.0 / 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_VALIDITY_CERTIFIED_BLOCKED=0.706, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.401, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Fri, 27 Feb 2026 12:17:26 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @envs.net) X-ZM-MESSAGEID: 1772212702201158500 From: Bingwu Zhang Unfixed mmap calls where start > reserved_va or the max guest addr should have a valid result. Signed-off-by: Bingwu Zhang --- tests/tcg/multiarch/test-mmap.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tests/tcg/multiarch/test-mmap.c b/tests/tcg/multiarch/test-mma= p.c index 88f7a04101a3..2bfa52912704 100644 --- a/tests/tcg/multiarch/test-mmap.c +++ b/tests/tcg/multiarch/test-mmap.c @@ -497,6 +497,20 @@ void check_shrink_mmaps(void) fprintf(stdout, " passed\n"); } =20 +void check_mmaps_beyond_addr_space(void) +{ + unsigned char *addr; + addr =3D mmap((void *)(-(unsigned long)pagesize * 10), pagesize * 2, + PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + fprintf(stdout, "%s addr=3D%p errno=3D%d", __func__, (void *)addr, err= no); + fail_unless(addr !=3D MAP_FAILED); + + memcpy(dummybuf, addr, 2 * pagesize); + munmap(addr, 2 * pagesize); + + fprintf(stdout, " passed\n"); +} + int main(int argc, char **argv) { char tempname[] =3D "/tmp/.cmmapXXXXXX"; @@ -540,6 +554,7 @@ int main(int argc, char **argv) check_file_unfixed_eof_mmaps(); check_invalid_mmaps(); check_shrink_mmaps(); + check_mmaps_beyond_addr_space(); =20 /* Fails at the moment. */ /* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */ --=20 2.52.0