diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2024-08-13 16:33:58 +1000 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2024-08-28 08:37:29 +0300 |
| commit | 1f1cbbd0d707d532477c9c58360306ccd920ddf1 (patch) | |
| tree | 5cd78afb871de1a3b48cbbd57a4c2afe5fdb9579 | |
| parent | db1f458542a98b336f60782f1066ed6dc6701e13 (diff) | |
linux-user: Preserve NULL hit in target_mmap subroutines
Do not pass guest_base to the host mmap instead of zero hint.
Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2353
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
(cherry picked from commit 3aefee3ec01e607529a9918e2978f365c5c3b5e9)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
| -rw-r--r-- | linux-user/mmap.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/linux-user/mmap.c b/linux-user/mmap.c index be3b9a68eb..2a11d921ab 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -559,9 +559,13 @@ static abi_long mmap_h_eq_g(abi_ulong start, abi_ulong len, int host_prot, int flags, int page_flags, int fd, off_t offset) { - void *p, *want_p = g2h_untagged(start); + void *p, *want_p = NULL; abi_ulong last; + if (start || (flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) { + want_p = g2h_untagged(start); + } + p = mmap(want_p, len, host_prot, flags, fd, offset); if (p == MAP_FAILED) { return -1; @@ -609,11 +613,15 @@ static abi_long mmap_h_lt_g(abi_ulong start, abi_ulong len, int host_prot, int mmap_flags, int page_flags, int fd, off_t offset, int host_page_size) { - void *p, *want_p = g2h_untagged(start); + void *p, *want_p = NULL; off_t fileend_adj = 0; int flags = mmap_flags; abi_ulong last, pass_last; + if (start || (flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) { + want_p = g2h_untagged(start); + } + if (!(flags & MAP_ANONYMOUS)) { struct stat sb; @@ -739,12 +747,16 @@ static abi_long mmap_h_gt_g(abi_ulong start, abi_ulong len, int flags, int page_flags, int fd, off_t offset, int host_page_size) { - void *p, *want_p = g2h_untagged(start); + void *p, *want_p = NULL; off_t host_offset = offset & -host_page_size; abi_ulong last, real_start, real_last; bool misaligned_offset = false; size_t host_len; + if (start || (flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) { + want_p = g2h_untagged(start); + } + if (!(flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) { /* * Adjust the offset to something representable on the host. |