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| author | Richard Henderson <richard.henderson@linaro.org> | 2024-08-15 11:06:38 +1000 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2024-08-15 11:06:38 +1000 |
| commit | 1bbb991a276ccac8318ff60ba49a1fbebabaeee3 (patch) | |
| tree | f6b5f457d26de5ed22f74a678172dc25e7143962 | |
| parent | c4d062885529a84928ddd260dab419b7d8dd4f90 (diff) | |
| parent | 3aefee3ec01e607529a9918e2978f365c5c3b5e9 (diff) | |
Merge tag 'pull-lu-20240815' of https://gitlab.com/rth7680/qemu into staging
linux-user: Preserve NULL hit in target_mmap subroutines
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* tag 'pull-lu-20240815' of https://gitlab.com/rth7680/qemu:
linux-user: Preserve NULL hit in target_mmap subroutines
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
| -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 4d09a72fad..6418e811f6 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -560,9 +560,13 @@ 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; @@ -610,11 +614,15 @@ 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; @@ -740,12 +748,16 @@ 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. |