42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
Source: @pullmoll
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Upstream: no
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Reason: errno=EFAULT when the address passed to mremap(2) is not valid
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See Rich Felker's comment at https://www.openwall.com/lists/musl/2017/06/21/2 for
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why we need to return errno as described in man mremap(2) from qemu-user-static.
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Also speed up the loop when checking for increasing the mappings size to go
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in steps of TARGET_PAGE_SIZE and OR-in a check for the very last byte of the range.
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--- linux-user/mmap.c 2019-04-23 20:14:46.000000000 +0200
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+++ linux-user/mmap.c 2019-06-30 16:31:26.545637450 +0200
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@@ -692,7 +692,7 @@
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if (!guest_range_valid(old_addr, old_size) ||
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((flags & MREMAP_FIXED) &&
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!guest_range_valid(new_addr, new_size))) {
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- errno = ENOMEM;
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+ errno = EFAULT;
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return -1;
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}
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@@ -728,9 +728,10 @@
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abi_ulong addr;
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for (addr = old_addr + old_size;
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addr < old_addr + new_size;
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- addr++) {
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+ addr += TARGET_PAGE_SIZE) {
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prot |= page_get_flags(addr);
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}
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+ prot |= page_get_flags(old_addr + new_size - 1);
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}
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if (prot == 0) {
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host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
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@@ -738,7 +739,7 @@
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mmap_reserve(old_addr + old_size, new_size - old_size);
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}
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} else {
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- errno = ENOMEM;
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+ errno = EFAULT;
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host_addr = MAP_FAILED;
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}
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/* Check if address fits target address space */
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