39 lines
1.4 KiB
Diff
39 lines
1.4 KiB
Diff
From cc47aef37004096cfe5788ce51d930543f614bbf Mon Sep 17 00:00:00 2001
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From: Alexander Graf <agraf@suse.de>
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Date: Thu, 13 Dec 2012 14:29:22 +0100
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Subject: [PATCH] linux-user: lseek: explicitly cast non-set offsets to signed
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When doing lseek, SEEK_SET indicates that the offset is an unsigned variable.
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Other seek types have parameters that can be negative.
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When converting from 32bit to 64bit parameters, we need to take this into
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account and enable SEEK_END and SEEK_CUR to be negative, while SEEK_SET stays
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absolute positioned which we need to maintain as unsigned.
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Signed-off-by: Alexander Graf <agraf@suse.de>
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---
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linux-user/syscall.c | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/linux-user/syscall.c b/linux-user/syscall.c
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index 08df03f..0b4668d 100644
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--- a/linux-user/syscall.c
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+++ b/linux-user/syscall.c
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@@ -5787,9 +5787,14 @@ abi_long do_syscall(void *cpu_env, int num, abi_ulong arg1,
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case TARGET_NR_oldstat:
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goto unimplemented;
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#endif
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- case TARGET_NR_lseek:
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- ret = get_errno(lseek(arg1, arg2, arg3));
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+ case TARGET_NR_lseek: {
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+ off_t off = arg2;
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+ if (arg3 != SEEK_SET) {
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+ off = (abi_long)arg2;
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+ }
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+ ret = get_errno(lseek(arg1, off, arg3));
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break;
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+ }
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#if defined(TARGET_NR_getxpid) && defined(TARGET_ALPHA)
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/* Alpha specific */
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case TARGET_NR_getxpid:
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