c92f9f8069
Support O_PATH file descriptors when handling fgetxattr and fsetxattr.
This avoids requiring file read access to pull extended attributes.
This is needed to support O_PATH file descriptors when calling
SELinux's fgetfilecon() call. In particular, this allows the querying
and setting of SELinux file context by using something like the following
code:
int dirfd = open("/path/to/dir", O_DIRECTORY);
int fd = openat(dirfd, "file", O_PATH | O_NOFOLLOW);
char *context;
fgetfilecon(fd, &context);
This change was motivated by a comment in
https://android-review.googlesource.com/#/c/152680/1/toys/posix/ls.c
(cherrypicked from commit 2825f10b7f)
Change-Id: Ic0cdf9f9dd0e35a63b44a4c4a08400020041eddf
16 lines
326 B
ArmAsm
16 lines
326 B
ArmAsm
/* Generated by gensyscalls.py. Do not edit. */
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#include <private/bionic_asm.h>
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ENTRY(___fgetxattr)
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mov ip, r7
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ldr r7, =__NR_fgetxattr
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swi #0
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mov r7, ip
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cmn r0, #(MAX_ERRNO + 1)
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bxls lr
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neg r0, r0
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b __set_errno_internal
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END(___fgetxattr)
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.hidden ___fgetxattr
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